A new mid-Cretaceous Neomeris - Université de Bretagne Occidentale
Transcrição
A new mid-Cretaceous Neomeris - Université de Bretagne Occidentale
A new mid-Cretaceous Neomeris (dasycladacean alga) from the Potiguar Basin, Brazil Bruno Granier, Dimas Dias-Brito & Ioan I. Bucur Facies International Journal of Paleontology, Sedimentology and Geology ISSN 0172-9179 Facies DOI 10.1007/s10347-012-0322-4 1 23 Your article is protected by copyright and all rights are held exclusively by SpringerVerlag. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your work, please use the accepted author’s version for posting to your own website or your institution’s repository. You may further deposit the accepted author’s version on a funder’s repository at a funder’s request, provided it is not made publicly available until 12 months after publication. 1 23 Author's personal copy Facies DOI 10.1007/s10347-012-0322-4 ORIGINAL ARTICLE A new mid-Cretaceous Neomeris (dasycladacean alga) from the Potiguar Basin, Brazil Bruno Granier • Dimas Dias-Brito Ioan I. Bucur • Received: 6 July 2012 / Accepted: 16 July 2012 Ó Springer-Verlag 2012 Abstract Neomeris (Lamouroux, 1816) is an extant taxon, the origin of which can be tracked back into Early Cretaceous times. The introduction of a new mid-Cretaceous species from Brazil, i.e., Neomeris srivastavai n. sp., offers the opportunity to review the subdivision of the genus into three subgenera, to complete the catalogue of the fossil calcareous algae of Brazil, and to point out the huge stratigraphic gap and lack of documentation between the first occurrence of the dasycladacean model of reproduction, i.e., choristospory, and the oldest record so far known of an undescribed fossil Neomeris (from Portugal). Keywords Dasycladales Dasycladaceae Neomeris Choristosporate Cretaceous Introduction Many dasycladalean genera are monospecific or comprise only a few species. In comparison, with more than 50 species over almost 120 myr, i.e., ranging from the Early B. Granier (&) Département des Sciences de la Terre et de l’Univers, UFR des Sciences et Techniques, Université de Bretagne Occidentale (UBO), 6 avenue Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France e-mail: [email protected] D. Dias-Brito Departamento de Geologia Aplicada, UNESPetro, Universidade Estadual Paulista, Rio Claro, IGCE, Caixa-Postal 178, av. 24 A 1515, Bela Vista, Rio Claro, SP 13506-900, Brazil I. I. Bucur Department of Geology, Babeş-Bolyai University, Str. M. Kogalniceanu nr.1, 400084 Cluj-Napoca, Romania Cretaceous times up to the present day, Neomeris (Lamouroux, 1816) has a relatively stable and successful body plan. This paper deals with the description of a new fossil species, an early representative found in Cenomanian strata of Brazil. A summary review of the genus Neomeris (Lamouroux, 1816) and its representatives Originally described as a coral-like animal by Lamouroux, (1816, p. 241–243), the living Neomeris dumetosa was later correctly assigned to the algae by Decaisne (1842, p. 142). The generic name itself, after that of one of the Nereids in the Greek mythology, has known some vicissitudes; this epithet was also given to polychaetes (Costa 1844) and even to a dolphin (Gray 1846). The main feature of this algal genus is a main stalk bearing regularly spaced verticils of laterals with two (exceptionally three, e.g., in the living N. stipitata Howe, 1909) secondary sterile segments and, where they are fertile, one gametophore in terminal position (choristosporate type) per primary segment. Aragonite precipitation on the outer side of the cytoplasmic envelope of these large unicellular benthic algae may form calcareous coatings that may be ‘‘preserved’’ in the sediments: the calcification process is mostly intercellular, i.e., extracellular sensu lato (Granier 2012), as it occurs in the open space between the stalk and the cortical layer formed by the juxtaposed distal parts of the laterals. The finds of such remains (‘‘tubes’’ or isolated ‘‘rings’’) in the fossil record led to the introduction of numerous synonyms and eventually some subgenera: Larvaria Defrance, 1822, Vaginopora Defrance in Bronn, 1825, Haploporella Gümbel, 1872, Herouvalina MunierChalmas ex Steinmann, 1899, Lemoinella L & J Morellet, 123 Author's personal copy Facies 1913, Meminella L & J Morellet, 1913, Sakkionella Segonzac, 1976, non 1970, and Drimella Radoičić, 1984. In addition to the type species, Neomeris dumetosa (Lamouroux, 1816), there are six extant species living in modern tropical and subtropical seas (Berger and Kaever 1992; Berger 2006), at least 37 Cenozoic species according to Deloffre and Granier (1992), and a small number of Cretaceous forms. Most Cenozoic specimens were collected in loose calcareous sand, which makes it easy to sort individual calcareous coatings and to understand the structure of these algae. This work was even eased by the use of scanning electron microscopy (SEM) since the 1980s (Génot 1980, 1985, 1987, 2009; Deloffre and Génot 1982; Génot and Granier 2011). Last but not least, some specimens may ‘‘have retained their original aragonite’’ (Génot 1985). On the contrary, the remaining specimens and Cretaceous ones are found embedded in limestones, commonly ‘‘recrystallized’’ (Granier 2012), which required thin-sections, either random or oriented, to reconstruct the algal structures resulting in lesser morphological detail. The catalogue of Jurassic and Cretaceous algae published by Bassoullet et al. (1978) lists four Cretaceous representatives: N. budaense Johnson, 1968, N. cretacea Steinmann, 1899, N. occidentalis (Johnson and Kaska, 1965), and N. pfenderae Konishi and Epis, 1962. In their inventory, Granier and Deloffre (1993) added three species to the list: N. circularis Badve and Nayak 1984, N. drimi Radoičić, 1984, and N. jerinae Radoičić, 1984; but they also removed three: N. pfenderae, which was transferred to the genus Genotella (Granier et al. 1991), as well as Larvaria occidentalis and Neomeris budaense, which are both considered nomina nuda [Granier et al. (1994) quote N. budaense in their synonymy list for Heteroporella lepina (Praturlon, 1967, non 1966)]. BRAZIL Fig. 1 Location map of the Petrobras well RNS-11 123 Fig. 2 All photomicrographs from sample 1,638-m depth, Petrobras c well 1-RNS-11, State of Rio Grande do Norte, Brazil. Scale bar is 1 mm (a), 250 lm (b–e). a The microfacies is a floatstone of large aggregates (ag) and ‘‘solenoporacean’’ nodules (n) with a pelletoidalooidal grainstone matrix. Geopetal (?) internal sediment is visible (m). b, d–e Neomeris srivastavai nov. sp. b, d Holotype: Oblique section of a rather highly calcified portion of a thallus. Both the axial stem and the primary segments of the laterals are calcified. b Natural light. d Contoured black and white negative image. e Random section cutting several verticils. c Thin-walled hyaline (? planktonic) foraminifers in the geopetal infilling of the primary intergranular porosity Further to the revision of Acroporella assurbanipali Elliott 1968 by Barattolo and Romano (2001) this fifth species is added to the list. Finally, Radoičić and Schlagintweit (2007) described one species: N. mokragorensis, while Radoičić (2002) introduced two new more: Neomeris conradi and N. decapoaae. Sokač (2004) considered these last two species as junior synonyms of N. cretacea Steinmann, 1899, a view that we cannot support because Steinmann’s species is ascribed to the subgenus Neomeris whereas both Radoičić’s species belong to the subgenus Drimella. To summarize, to date, eight Cretaceous species are valid, the subgeneric assignment of which is given in Table 1. Material and geological information The material comes from a Petrobras exploration well (1-RNS-11) drilled through the Ponta do Mel Formation in the Potiguar Basin, offshore of Macau, Rio Grande do Norte (Fig. 1). Material The material studied consists of two acetate peels and five thin-sections cut in a core sample at 1,638-m depth. Author's personal copy Facies 123 Author's personal copy Facies Locality Petrobras well 1-RNS-11, 30 km North of Macau, State of Rio Grande do Norte, SAD 69 (Brazil): UTM 24S 776981.92E 9461584.57 N as indicated by ANPBDEP (latitude 4°510 59.19800 S, longitude 36°300 9.65500 W; see Google Maps: -4.866444, -36.502682). Stratigraphic level The specimens are from the uppermost part of the Ponta do Mel Formation, (? Late Albian-) Cenomanian in age (Tibana and Terra 1981; Granier et al. 2008). Facies, assemblage, and paleoenvironment: The microfacies (Fig. 2a) displays a grain-dominated fabric; it is a floatstone of large aggregates and ‘‘solenoporacean’’ nodules (with Marinella and Pycnoporidium) with a poorly sorted grainstone matrix. The smaller grains are pelletoids, followed by micritic ooids that are slightly larger. Bioclasts are few, partly micritized and commonly microbially coated: echinoderms, small gastropods, mollusc shells, few benthic foraminifers, including Trocholina sp., and calcareous green algal remains (the new Neomeris, a Clypeina sp., and a Linoporella ? sp., see Granier et al. 2008, pls. 1–2). The intergranular space is filled by calcitic cements, mostly drusy calcite and some syntaxial cement surrounding echinoderm remains. There are also local patches consisting of micrite and small grains, which are geopetally arranged. Among these grains, we identified thin-walled hyaline (? planktonic) foraminifers (Fig. 2c). Part of this material possibly percolated through the grainy column from the discontinuity (transgressive surface) sited a few meters above and which marks the boundary between the shallow-water, moderate-energy facies of the Ponta do Mel Formation and the pelagic facies of the Jandaira Formation (Granier et al. 2008). Table 1 Subgeneric assignment of the Cretaceous species of Neomeris Fig. 3 Neomeris srivastavai nov. sp. All specimens from sample c 1,638.0 m depth, Petrobras well 1-RNS-11, State of Rio Grande do Norte, Brazil. Scale bar is 250 lm (a–f). Thin-sections (a, c, e–f) and acetate peels (b, d; made prior to the thin-sectioning). a–b Paratype: Transverse sections cut some tens of micrometers apart. c–d Subtransverse sections cut some tens of micrometers apart. The axial stem is not calcified. e–f Oblique sections cutting several successive verticils Elements of comparison and description The discussion on the subgeneric assignment of the new species can be abridged because it was already addressed by Granier et al. (2008, p. 313, pl. 1, fig. A). The arrangement of the pair of secondary segments with respect to the ampulla, that is they are presently sited on both side of the ampulla, is characteristic of the subgenus Neomeris (Table 1). Accordingly comparisons can only be made with two Cretaceous species: N. (N.) cretacea Steinmann, 1899, and N. (N.) mokragorensis Radoičić & Schlagintweit, 2007. The degree of calcification has often been regarded as a diagnostic character at the species level. Génot (1985, figs. 2, 3; 1994, tables 1–3) illustrated the variability of the intercellular calcification between discrete species and within a single species. Out of the eight Cenozoic representatives of the subgenus Larvaria he studied, none are calcified on the primary segment of their laterals, three are rarely strongly calcified along the axial stem: N. (L.) auversiensis (L & J Morellet, 1913)*, N. (L.) encrinula (Defrance, 1822), and N. (L.) montiensis (L & J Morellet, 1922), while fragments of the central stem are exceptionally preserved in a fourth species: N. (L.) filiformis (L & J Morellet, 1913). Similarly for his twelve representatives of the subgenus Neomeris (Génot, 1994), one only is commonly heavily calcified: N. (N.) larvarioides (L & J Morellet, 1913), Neomeris (N.) X conradi Radoičić, 2002 cretacea Steinmann, 1899 X X decapoaae Radoičić, 2002 123 N. (Drimella) Sketch [r2st = secondary segment of the lateras, sterile; = gametophore (sporangium)] assurbanipali (Elliott, 1968) N. circularis Badve & Nayak, 1984, has not been included here because it is only known from a single very poor random section lacking diagnostic features N. (Larvaria) X drimi Radoičić, 1984 X jerinae Radoičić, 1984 X mokragorensis Radoičić & Schlagintweit, 2007 X The new species described herein X Author's personal copy Facies 123 Author's personal copy Facies and a second species may exceptionally be: N. (N.) scrobiculata (Gümbel 1872). *Note: according to Génot and Le Renard (2011), Neomeris (Larvaria) auversiensis (L & J Morellet, 1913) is a junior synonym of N. (L.) encrinula (Defrance, 1822). Our new species has calcified stalks, but not the other Cretaceous species, i.e., neither Neomeris (N.) cretacea nor N. (N.) mokragorensis. However, we should not retain this feature as a main diagnostic character because it appears that the calcification of the main axis is related to the external diameter of the portion studied. The smaller illustrated sections (Figs. 2b, d,3a, b,4c) show a calcified main axis; they represent probably the proximal and ?distal ends of the thallus. In conclusion, the degree of calcification not only varies from one individual to the other within the same species (see discussion in Granier 2012), but as for their modern counterparts it also varies within a single specimen. Figure 3a and b illustrate transverse sections of the same specimen. They were ‘‘cut’’ some micrometers apart, a result which was obtained through the making of an acetate peel prior to the making of the thin-section from the same rock slice. They show that over a short distance the axial stem may widen, while the external diameter of the thallus remains almost constant. Figure 4a illustrates an oblique section through a large portion of a thallus. The general shape of the alga is probably not strictly cylindrical, but it could be either fusiform (thinning at both ends) or more probably club-shaped (with a narrow proximal end and a large distal end), a morphology still present in living Neomeris (Berger and Kaever 1992; Berger 2006). Morphological features and measurements (summarized in Table 2) help us to easily discriminate the new species from the two Cretaceous representatives of the subgenus Neomeris. Génot (1994) stated that ‘‘features of the reproductive organs appear to be one of the most useful criteria to separate species or groups of species’’. It applies to N. (N.) cretacea, which has ‘‘ovoidal to ellipsoidal ampullae’’ (Barattolo 1990), though both the new species and N. (N.) mokragorensis have subspherical ampullae. In addition, the dimensions of the Brazilian species are also commonly closer to those of N. (N.) mokragorensis. However, (1) this ‘‘Alpine’’ species bears more laterals per verticil, (2) its fertile ampullae are smaller, and (3) its verticils are set closer, consequently in tangential or oblique sections the gametophores look rather imbricated while in the Brazilian species they are relatively wider spaced. For a while, some specimens of N. (N.) cretacea were erroneously considered as a genuine representative of the genus Macroporella (Pia, 1912), i.e., Macroporella aptiensis Sokač, 1989, until recently when this author 123 Fig. 4 Neomeris srivastavai nov. sp. All specimens from sample c 1,638-m depth, Petrobras well 1-RNS-11, State of Rio Grande do Norte, Brazil. Scale bar is 250 lm (a–d). a Paratype: Oblique section of a large thallus (Granier et al. 2008, p. 313, pl. 1, fig. a). b Oblique section of a poorly calcified thallus, only the distal part of the laterals was calcified. c, d Sub-transverse sections, partly micritized (c) and coated (d) acknowledged his mistake (Sokač, 2004). The calcareous skeleton of N. (N.) cretacea is rather thick and isopachous, and both secondary laterals and the ampullae are embedded in the ‘‘calcitic wall’’ where they form pores; in contrast, in both the new species and N. (N.) mokragorensis, the ampullae are enveloped in a relatively thin crust and the morphology of the internal surface of the calcareous tube is covered with little bumps corresponding to individual ampullae (Figs. 2b, d, e,3c, d,4a). Systematics Phylum Chlorophyta Class Dasycladophyceae Hoek et al., 1995 Order Dasycladales Pascher, 1931 Family Dasycladaceae (Kützing, 1841) Tribe Dasycladeae Pia, 1920 Genus Neomeris Lamouroux, 1816 Subgenus Neomeris (Lamouroux, 1816) Pia in Hirmer, 1927 Neomeris (Neomeris) srivastavai nov. sp. (Figs. 2b, d, e, 3a–f, 4a–d) 2008 Neomeris (Neomeris) sp.—Granier et al., Potiguar Basin (NE Brazil), Ponto do Mel Formation (Upper Albian-Cenomanian): 313, pl. 1, fig. A 2008 Cymopolia perkinsi—Granier et al., Potiguar Basin (NE Brazil), Ponto do Mel Formation (Upper Albian-Cenomanian): 313, pl. 1, fig. C Origin of the name The species is dedicated to Prof. Dr. Narendra Kumar Srivastava (1973, 1982a, 1982b, 1984), Universidade Federal do Rio Grande do Norte (UFRN), Natal, Brazil, for his contribution to the knowledge of Cretaceous dasycladalean algae. Type material The holotype is the specimen illustrated by the oblique section (Fig. 2b, d) from a thin-section cut in a core sample at 1,638 m, well 1-RNS-11 (offshore Rio Grande do Norte, Brazil). Two paratypes were selected to help in completing the description: one is illustrated by two transverse sections (Fig. 3a, b), the other by an oblique section (Fig. 4a). This material is currently housed in the first author’s collection (it will be later transferred to the national collections at the Faculty of Sciences in Lyons (FSL), University Claude Bernard—Lyon I, Villeurbanne). Author's personal copy Facies 123 Author's personal copy Facies Table 2 Biometric data of the three Cretaceous species assigned to the subgenus Neomeris (L maximum length, D external diameter, d diameter of the stem, ‘‘d’’ diameter of the axial cavity, l0 length of the primary segment of the laterals, ls length of the ampulla, w number of laterals per verticil, h height of a ‘‘whorl’’ (verticil) plus one interverticillar spacing, p0 width of the primary segment of the laterals, p00 width of the secondary segment of the laterals, ps width of the ampulla) In mm Neimeris (N.) srivastavi n. sp. N. (N.) cretacea Steinmann 1899 (according to Barattolo 1990) N. (N.) mokragorensis Radoičić and Schlagintweit 2007 (according to Schlagintweit and Ebli 1995) L [4.5 [15 [2 D 1.08–1.86 1.387 ± 0.302 1.29 ± 0.49 d 0.32, 0.38, 0.42 (3) Not applicable 0.44 (1) ‘‘d’’ 0.64–0.90 0.774 ± 0.220 0.99 ± 0.37 e = (D - ‘‘d’’)/2 0.16–0.27 0.305 ± 0.053 0.16 ± 0.04 d/D 30 %, 33 %, 32 % (3) n.a. 29 % (1) ‘‘d’’/D 56–68 % 42.9–63.7 % 60–88 % w 16–20 16 - 34 25 - 34 h *0.20 0.10 - 0.20 0.08 ± 0.06 p0 *0.04 n.a. n.a. l0 0.14, 0.16, 0.22 (3) n.a. n.a. p *0.04 (proximal) to *0.08 (distal) 0.040 ± 0.006 0.034 ± 0.009 ls (Gametophore) 0.14–0.18 0.229 ± 0.037 0.13 ± 0.03 00 ps (Gametophore) Not: 0.088 ± 0.014 (3) = Three measurements only 0.097 ± 0.033 (1) = Based on their Fig. 7 Fig. 5 All photomicrographs from sample ALCL 10-3bas 9/83 (Pierre-Yves Berthou Collection), Estoi-Pão Branco, Algarve, Portugal, Upper Berriasian or Lower Valanginian. Scale bar is 250 lm (a–d). a–d Various random (oblique) sections of a Neomeris sp. 123 Author's personal copy Facies Diagnosis Roughly cylindrical (fusiform or club-shaped) thallus with simple verticils (euspondyle) arranged in a regular alternation but without a strong imbrication. Bumpy axial cavity, i.e., inner side of the outer calcareous tube. Main axis locally calcified, at the proximal and ?distal ends of the thallus, forming an inner calcareous tube. Laterals, where fertile, consisting of a primary segment bearing a pair of secondary sterile segments set on both sides of a single spheroidal ampulla (a trait that refers it to the subgenus Neomeris) in terminal position (choristosporate type). The biometric data (Table 2) should also be taken into consideration to discriminate this species from other representatives of the subgenus. Measurements Table 2. Keys for prospective research The introduction of this new taxon represents an advance in the ongoing inventory of the fossil calcareous algae from Brazil (Granier et al. 2008, 2012). It is also a new step in the knowledge of the representatives of the genus Neomeris during the Cretaceous. In Brazil, records are from Albian and Cenomanian strata (Srivastava 1982a; Granier et al. 1991a, b). According to Barattolo and Romano (2001), the first worldwide record ever would date back from the Valanginian or the Hauterivian times with N. (Larvaria) assurbanipali (Elliott 1968) of the Garagu Formation of Iraq. However, because Pseudocyclammina lituus (Yokohama, 1890) is a typical foraminifer of this stratigraphic unit, the age uncertainty regarding this first occurrence could be reduced from two stages to half a stage, i.e., to the Early Valanginian. N. (L.) assurbanipali is competing for the oldest record of the genus with an undescribed species from Algarve, Portugal (Fig. 5). The latter could be Early Valanginian or even Late Berriasian in age because it is found in a phycological assemblage consisting of Clypeina sp., Fourcadella sp., ? Falsolikanella sp., Permocalculus sp., Rajkaella minima (Jaffrezo, 1973), Terquemella sp., and Zergabriella embergeri (Bouroullec and Deloffre, 1968), above a level with Pseudocymopolia jurassica (Dragastan 1978, non 1968); it is associated with numerous foraminifers with agglutinated tests, and Trocholina gr. alpina (Leupold 1935), Mohlerina basiliensis (Mohler, 1938), and Protopeneroplis trochangulata Septfontaine, 1974. The earliest representative of Neomeris should have been ‘‘born’’ at the transition between the Jurassic and the Cretaceous. Now considering the choristosporate model of reproduction, which is the main trait of the family Dasycladaceae, as emended by Granier and Bucur (Granier et al. 2012), the ancestor could be tracked back to Eodasycladus from Liassic times (Barattolo et al. 1994, 2012), which represents a huge stratigraphic gap and accordingly which leaves us with a large stratigraphical field to seek the missing links. Acknowledgments This paper is a contribution to the special volume of Facies dedicated to the ‘‘10th International Symposium on Fossil Algae’’ held in Cluj-Napoca (Romania, September 12–18, 2011). We thank Petrobras for ceding the investigated material to the second author of this paper previously to the creation of the Brazilian Petroleum National Agency—ANP. This research was supported by the ‘‘Carbonatos do Brasil Project’’ linked to the Brazilian Sedimentology/Stratigraphy Net sponsored by Petrobras. We thank Petrobras, ANP, and FUNDUNESP (Fundação para o Desenvolvimento da Universidade Estadual Paulista ‘‘Julio de Mesquita Filho’’, Rio Claro, São Paulo, Brazil). Thanks go also to the reviewers, Patrick Génot, Felix Schlagintweit, and an anonymous reviewer, for making useful suggestions, to Franz T. Fürsich for editorial work and to Robert W. Scott for improving the quality of the English. References Badve RM, Nayak KK (1984) Some additional fossil algae from the Nimar Sandstone, Bagh Beds, Madhya Pradesh, India. In: Proceedings of the X Indian colloquium on micropaleontology and stratigraphy, Maharashtra Association for the Cultivation of Science, Pune, pp 185–196 Barattolo F (1990) Remarks on Neomeris cretacea Steinmann (Chlorophyta, Dasycladales) from the Cretaceous of Orizaba (type-locality), Mexico. Boll Soc Paleont Ital 29:207–218 Barattolo F, Romano R (2001) Systematic affinity of Acroporella assurbanipali Elliott (Dasycladaceae), with notes on the genus Neomeris. Bull Nat Hist Mus (Geol) 57:109–114 Barattolo F, De Castro P, Parente M (1994) Some remarks on the genera Palaeodasycladus (Pia, 1920) Pia, 1927 and Eodasycladus Cros & Lemoine, 1966 ex Granier & Deloffre, 1993 (green algae, Dasycladales). In: Piller WE (ed) Proceedings of the international symposium and field-meeting ‘‘Alpine Algae ‘93’’. Beitr Paläont 19:1–11 Barattolo F, Shirazi MPN, Vecchio E (2012) The genus Eodasycladus (Lower Jurassic dasycladalean green alga) and its relationship with Palaeodasycladus. Facies. doi:10.1007/s10347-012-0304-6 Bassoullet J-P, Bernier P, Conrad MA, Deloffre R, Jaffrezo M (1978) Les Algues Dasycladales du Jurassique et du Crétacé. Géobios, Mém spéc 2:1–330 Berger S (2006) Photo-atlas of living Dasycladales. Carnets Géol, Book 2006/02, p 348, doi:10.4267/2042/5831 Berger S, Kaever MJ (1992) Dasycladales. An illustrated monograph of a fascinating algal order. Georg Thieme Verlag, Stuttgart, p 247 Bronn HG (1825) System der urweltlichen pflanzenthiere. Heidelberg, p 47 Costa OG (1844) Sul sistema circolatore ed altre particolarita della Neomeris urophylla (Nuove genere di Annelide). Osservazioni. Ann Accad aspir natur Napoli II:81–87 Decaisne J (1842) Mémoire sur les corallines ou polypiers calcifères. Ann Sci Nat (2nde sér) XVIII—Botanique: 96–128 Defrance MJL (1818–1828) In: Dictionnaire des Sciences naturelles. Le Normant et Levrault, Paris, 62 vols (text) ? 6 vol (pls) Deloffre R, Génot P (1982) Les Algues Dasycladales du Cénozoı̈que. Bull Centr Rech Explor-Prod elf-aquitaine Mém 4:1–247 Deloffre R, Granier B (1992) Inventaire des Algues Dasycladales fossiles. I partie—Les Algues Dasycladales du Tertiaire. Rev Paléobiol 11:331–356 123 Author's personal copy Facies Elliott GF (1968) Permian to Palaeocene calcareous algae (Dasycladaceae) of the Middle East. Bull Brit Mus (Nat Hist), Geol (Pal) ser. Suppl 4:1–111 Génot P (1980) Les Dasycladacées du Paléocène supérieur et de l’Eocène du bassin de Paris. Mém Soc géol Fr (NS) LIX(138):1–40 Génot P (1985) Calcification in fossil Neomereae (Dasycladales). In: Toomey DF, Nitecki MH (eds) Paleoalgology. Contemporary research and applications. Springer, Heidelberg, pp 264–272 Génot P (1987) Les Chlorophycées calcaires du Paléogène d’Europe nord-occidentale (Bassin de Paris, Bretagne, Cotentin, Bassin de Mons). Thèse de Doctorat d’État, Université de Nantes, vol I, II, pp 1–500, 1–48 Génot P (1994) Specific distinctive criteria in Neomeris (Dasycladales). In: Piller WE (ed) In: Proceedings of the international symposium and field-meeting ‘‘Alpine Algae ‘93’’. Beitr Paläontol 19, pp 103–111 Génot P (2009) Cenozoic Dasycladales. A photo-atlas of Lutetian species from French Cenozoic basins. Carnets Géol, Book 2009/01, p 180 doi:10.4267/2042/21981 Génot P, Granier B (2011) Cenozoic Dasycladales. A photo-atlas of Thanetian, Ypresian and Bartonian species from the Paris Basin. Carnets Géol, Book 2011/01, p 44, doi:10.4267/2042/43105 Génot P, Le Renard J (2011) New species and data on Lutetian Dasycladales (calcareous algae) of Cotentin (Normandy, France). Rev Españ Micropaleont 43:141–155 Granier B (2012) The contribution of calcareous green algae to the production of limestones: a review. In: Basso D, Granier B (eds) Calcareous algae and the global change: from identification to quantification. Geodiversitas 34:35–60 Granier B, Deloffre R (1993) Inventaire critique des algues dasycladales fossiles. II partie—Les Algues Dasycladales du Jurassique et du Crétacé. Rev Paléobiol 12:19–65 Granier B, Berthou P-Y, Fourcade E (1991a) The Dasycladalean algae from the Cretaceous of the New World. Transactions of the second geological conference of the Geological Society of Trinidad and Tobago, Port-of-Spain, April 2nd–8th, 1990, pp 178–183 Granier B, Berthou P-Y, Poignant AF (1991b) Constructions biosédimentaires laminées, Lithothamnium et Parachaetetes de la Formation Riachuelo (Albien) du bassin de Sergipe (Nord-Est du Brésil). Geociências, Sâo Paulo 10:169–181 Granier B, Masse J-P, Berthou P-Y (1994) Heteroporella lepina Praturlon, 1967, revisited (followed by taxonomic notes on the so-called ‘‘Heteroporella’’ species). In: Piller WE (ed) Proceedings of the international symposium and field-meeting ‘‘Alpine Algae ‘93’’. Beitr Paläont 19:1029–141 Granier B, Dias-Brito D, Bucur II (2008) Calcareous algae from Upper Albian–Cenomanian strata of the Potiguar Basin (NE Brazil). Geol Croat 61:311–320 Granier B, Dias-Brito D, Bucur II, Tibana P (2012) Brasiliporella, a new mid-Cretaceous dasycladacean genus: the earliest record of the Tribe Batophoreae. Facies, p 14. doi:10.1007/s10347012-0312-6 Gray JE (1846) On the cetaceous animals. In: Richardson J, Gray JE (eds) Mammalia. The zoology of the voyage of H. M. S. Erebus and Terror, under the command of Captain Sir James Clark Ross, R.N., F.R.S., during the years 1839–1843, vol I, part III, E W Janson, London, pp v–xii ? 13–53 Gümbel CW (1872) Die sogenannten Nulliporen (Lithothamnium und Dactylopora) und ihre Betheiligung an der Zusammensetzung 123 der Kalkgesteine. Zweiter Theil: Die Nulliporen des Thierreichs (Dactyloporideae) nebst Nachtrag zum ersten Theile. Abh II Cl k Akad Wiss (Math phys Cl) XI:231–290 Johnson JH (1968) Lower Cretaceous algae from Texas. Prof Contrib Colorado School Mines 4:1–71 Johnson JH, Kaska HV (1965) Fossil algae from Guatemala. Prof Contrib Colo Sch Mines 1:1–152 Konishi K, Epis RC (1962) Some Early Cretaceous calcareous algae from Cochise County, Arizona. Micropaleontology 8:67–76 Lamouroux JV (1816) Histoire des polypiers coralligènes flexibles, vulgairement nommés Zoophytes. F. Poisson, Caen p lxxxiv ? 560, http://www.biodiversitylibrary.org/item/42840# Morellet L, Morellet J (1913) Les Dasycladacées du Tertiaire parisien. Mém Soc géol Fr (Paléont) XXI/1(47):1–43 Morellet L, Morellet J (1922) Nouvelle contribution à l’étude des Dasycladacées tertiaires. Mém Soc géol Fr (Paléont) XXV/ 2(58):1–33 Pia J (1927) 1. Abteilung: Thallophyta. In: Hirmer M (ed) Handbuch der Paläobotanik. Bd I: Thallophyta—Bryophyta—Pteridophyta. R. Oldenbourg, Munich & Berlin, pp 31–136 Radoičić R (1984) New species and new subgenus of Neomeris (Dasycladaceae, green algae) from the Upper Cretaceous of Metohija. Bull Acad Serbe Sci Arts (Sci nat) LXXXVI(25): 17–32 Radoičić R (2002) Dasycladalean algae from the Lower Cretaceous of Mt Rujen (Vardar Zone, Macedonia). Rev Paléobiol 21:7–19 Radoičić R, Schlagintweit F (2007) Neomeris mokragorensis sp. nov. (Calcareous alga, Dasycladales) from the Cretaceous of Serbia, Montenegro and the Northern Calcareous Alps, (Gosau Group, Austria). Geol anal Balkansk poluostr 68:39–51 Schlagintweit F, Ebli O (1995) Remarks on Neomeris circularis Badve & Nayak, 1983 (calcareous alga, Dasycladacea). Jb geol B-A 138:715–724 Segonzac G (1970) Dasycladales nouvelles du Sparnacien des Pyrénées ariégeoises. C R Acad Sci Paris (D) 270:1881–1884 Segonzac G (1976) Dasycladacées nouvelles ou peu connues du Thanétien des Pyrénées. Bull Soc Hist Nat Toulouse 112:123–136 Sokač B (1989) Macroporella aptiensis n. sp. (Calcareous algae; Dasycladales) from the peri-reefal Lower Aptian limestones in western Croatia. Geol Vjesnik 42:1–6 Sokač B (2004) On some peri-Mediterranean Lower Cretaceous Dasyclad species (calcareous algae; Dasycladales) previously assigned to different genera. Geol Croat 57:15–53 Srivastava NK (1973) Neocomian calcareous algae from Bolshoi Balkhan, USSR. N Jb Geol Paläont 11:690–708 Srivastava NK (1982a) Calcareous algae from Jandaı́ra Formation (Potiguar Basin), Brazil: part I. Anais Acad brasil Cienc 54:219–231 Srivastava NK (1982b) Trinocladus norteriograndensis, n.sp., a new dasycladacean alga from Jandaı́ra formation (Potiguar Basin), northeastern Brasil: part II. Bol Depart Geol (CCE/UFRN) 6:23–26 Srivastava NK (1984) Algas calcáras e esus ambientes deposicionais na Formação Jandaı́ra da Bacia Potiguar (RN), parte III. Atas do XI Simpósio de Geologia do Nordeste, Natal, pp 361–369 Steinmann G (1899) Ueber fossile Dasycladaceen vom Cerro Escamela, Mexico. Bot Z VIII:137–154 Tibana P, Terra GJS (1981) Seqüências carbonáticas do Cretáceo na Bacia Potiguar. Bol Técn Petrobrás 24:174–183
Documentos relacionados
Brasiliporella, a new mid-Cretaceous dasycladacean genus: the
䉳 Fig. 5 Brasiliporella nkossaensis, emend., nov. comb. All specimens from sample 505, 652 m depth, Petrobras Well 2-AD-1, State of Maranhão, Brazil. Scale bar is 500 m (a–f), 200 m (g–h). a Shal...
Leia mais