Marine Holocene Ostracoda from the Pacific Coast of North and Central America

Swain, Frederick M.; Gilby, J. M.

doi:10.2307/1484940

Cited by 39 publications

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“…Family LOXOCONCHIDAE Sars, 1925 Genus PALMOCONCHA Swain and Gilby, 1974 Material. Sixteen carapaces (adult) from SD 60 (length 588±686 mm, height 333±401 mm, h/l 0´543±0´679).…”

Section: Plate 1 ®Gures 5±6mentioning

confidence: 99%

Biota, palaeoenvironments and biostratigraphy of continental Oligocene deposits of the South German Molasse Basin (Penzberg Syncline)

Reichenbacher¹,

Uhlig²,

Kowalke³

et al. 2004

Palaeontology

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ABSTRACT. Six charophyte, 13 mollusc, four ostracod and nine ®sh otolith taxa are taxonomically described, and one fruit, one seed and two foraminiferal taxa are brie¯y noted from the Lower Cyrena Beds and the Lower Coloured Molasse of the Sindelsdorf section near Penzberg (approximately 50 km south of Munich). Our palaeoecological and lithological data from the Lower Cyrena Beds suggest a delta plain with lagoons, estuaries, slowly¯owing rivers, lakes and swamps. Faunal and¯oral elements of the Lower Coloured Molasse indicate lacustrine environments. The gastropod Tympanotonos and the tropical to subtropical ®sh fauna (Eleotridae, Ambassidae and Cyprinodontidae) suggest a warm, at least subtropical climate. Furthermore, Tympanotonos suggests comparisons with Recent molluscan faunas of the mangrove swamps of the West African coast, and thus hints at mangrove vegetation bordering the coasts of the Upper Bavarian Molasse Sea. A biostratigraphical classi®cation for the Oligocene Molasse deposits of the Penzberg Syncline is established for the ®rst time based on otoliths and charophytes. The Lower Cyrena Beds are attributed to the newly de®ned otolith zone OT-O1/2 and probably correspond to the oldest part of the Chara microcera Zone. The lowermost part of the Lower Coloured Molasse can be correlated both with otolith zone OT-O2 and the Chara microcera Zone. The Sindelsdorf section lies within the Rupelian±Chattian transition zone and thus the chronostratigraphic age is approximately 29±28 Ma.KEY WORDS: continental Oligocene, South German Molasse Basin, charophytes, molluscs, ostracods, ®sh otoliths.C O N T I N E N T A L deposits of Oligocene age in the South German Molasse Basin are herein considered on a broad palaeontological basis for the ®rst time. The section studied, situated in the Penzberg Syncline (Text-®gs 1±2), is 170 m thick and can be correlated with the Lower Cyrena Beds (Lower Brackish-Water Molasse) and the lowermost part of the Lower Coloured Molasse (Lower Freshwater Molasse) (Text-®g. 3). Charophytes, molluscs, ostracods and ®sh otoliths are taxonomically described, and fruits, seeds and foraminifers are brie¯y noted. Our palaeoecological analysis suggests varying environments in a tropical to subtropical climate. Biostratigraphical analysis based on the charophyte¯ora and ®sh otoliths suggests a latest Rupelian and/or earliest Chattian age for the succession.Previous studies of charophytes and ®sh otoliths from the lower Chattian of the Marienstein and Murnau synclines in the Southern German Molasse Basin include those published in Reichenbacher and Schwarz (1997), Uhlig et al. (2000) and Reichenbacher and Uhlig (2002). The Oligocene molluscs from this region have been studied by Zo Èbelein ( , 1955( ), Ho Èlzl (1957 and Barthelt (1989), and the ostracods by Witt (1967) and Mu Èller (1985). However, none of these publications dealt with the Lower Cyrena Beds in the Penzberg Syncline. Barthelt (1989) considered the depositional environment represented by the Lower Brackish-Water Molasse. She reco...

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“…Family LOXOCONCHIDAE Sars, 1925 Genus PALMOCONCHA Swain and Gilby, 1974 Material. Sixteen carapaces (adult) from SD 60 (length 588±686 mm, height 333±401 mm, h/l 0´543±0´679).…”

Section: Plate 1 ®Gures 5±6mentioning

confidence: 99%

Biota, palaeoenvironments and biostratigraphy of continental Oligocene deposits of the South German Molasse Basin (Penzberg Syncline)

Reichenbacher¹,

Uhlig²,

Kowalke³

et al. 2004

Palaeontology

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“…However, in the opinion of the present authors, the material described and illustrated by Allison & Holden (1971) possesses a quite different central muscle scars pattern, smaller dimensions (being much narrower in dorsal view), and conspicuous differences in ornaments. Swain & Gilby (1974) figured a left side of a complete carapace of a large species identified by them as C. praecipua, but with a complete different size, outline and ornamentation when compared with the Bold's original material and the specimens illustrated and described by Antonietto et al (2012). Teeter (1975) presented a very poor figure of a male carapace that resembles the male figured by Bold (1963) and possesses dimensions compatible with it.…”

Section: Discussionmentioning

confidence: 92%

“…Antonietto et al (2012) supposed that all Bold's specimens look very similar to the males of Keijcyoidea registered in the Archipelago of São Paulo and São Pedro, and believed that the true females of K. praecipua were described for the first time in their study. Furthermore, in the paper of Antonietto et al (2012), the material of Cytherelloidea praecipua Bold, 1963 figured and described by Allison & Holden (1971), Swain & Gilby (1974) and Teeter (1975) were considered co-specific with the specimens of Keijcyoidea recorded by them. However, in the opinion of the present authors, the material described and illustrated by Allison & Holden (1971) possesses a quite different central muscle scars pattern, smaller dimensions (being much narrower in dorsal view), and conspicuous differences in ornaments.…”

Section: Discussionmentioning

confidence: 99%

Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

Coimbra

Bottezini

Machado

2013

Iheringia, Sér. Zool.

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ABSTRACT. The present study is a further contribution to the systematic knowledge of the shallow water marine ostracodes from the Brazilian oceanic islands. A total of 14 species belonging to 10 genera and eight families is herein identified. One new genus and species are described and illustrated: Berguecythere insularis gen. nov., sp. nov. In addition to this new taxon, the abundant species Loxocorniculum tricornatum Krutak, 1971, widely distributed in recent sediments in the Gulf of Mexico, Caribbean, north and northeast of Brazil and the Rocas Atoll, along with the cosmopolitan tropical ostracode Triebelina sertata Triebel, 1948, were also identified at specific level. The remaining 11 species were left at the genus level, and should provide new species. Ecological, zoo-and paleozoogeographical aspects were also briefly discussed.KEYWORDS. Taxonomy, new species, morphology, Atlantic Ocean. RESUMO. Ostracoda (Crustacea) do Arquipélago de São Pedro e São Paulo, Atlântico Equatorial, com ênfase em novo gênero deHemicytheridae. O presente estudo é uma contribuição para o conhecimento da sistemática dos ostracodes marinhos rasos das ilhas oceânicas brasileiras. Um total de 14 espécies pertencentes a 10 gêneros e oito famílias é aqui identificado. Um novo gênero e espécie são descritos e ilustrados: Berguecythere insularis gen. nov., sp. nov. Além desse novo táxon, foram também identificados Loxocorniculum tricornatum Krutak, 1971, espécie abundante amplamente distribuída em sedimentos recentes do Golfo do México, Caribe, norte e nordeste do Brasil e no Atol das Rocas, e o ostracode cosmopolita tropical Triebelina sertata Triebel, 1948. As 11 espécies restantes foram deixadas em nível de gênero e devem fornecer novas espécies. Aspectos ecológicos e zoo-e paleozoogeográficos também foram brevemente discutidos.

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“…This is surprising, given that the rocky intertidal habitats of California has been the subject of scientific investigations for over a century. Several studies have analyzed ostracode biogeography off the western coast of North America (Swain, 1969;Swain & Gilby, 1974;Valentine, 1976), but these were regional in scale and included few specifically algal samples. Nevertheless, these studies recovered many of the species observed in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…Although there have been previous biogeographic surveys of California ostracodes (Swain, 1969;Valentine, 1976), these studies focused almost entirely on subtidal, soft-sediment environments. Quantitative ecological studies of phytal ostracodes from this region are currently lacking.…”

Section: Introductionmentioning

confidence: 99%

Intertidal meiofaunal biodiversity with respect to different algal habitats: a test using phytal ostracodes from Southern California

2007

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Rocky intertidal algae harbor a diverse invertebrate meiofauna of arthropods, nematodes and other invertebrates. Despite its ecological importance, relatively little is known about the diversity and composition of this important component of intertidal biodiversity. In this study, we quantified species composition, abundance and distribution of ostracodes, an important group of phytal meiofauna, at two different intertidal areas in southern California. In total, we recovered 22 ostracode species from three different orders (16 podocopids, five myodocopids and one platycopid), nearly a quarter of which could not be assigned to existing taxa. The abundance of ostracodes differed significantly among algal types, with structurally complex algae bearing many more ostracodes per gram of algae than simple forms (blade-like algae and the surfgrass Phyllospadix). Although most ostracode species were recovered from multiple kinds of algae, different algae harbored distinct assemblages that could be discriminated statistically on the basis of relative abundances of ostracode species. This segregation of the ostracode fauna according to algal species is evident even over very short spatial scales (<1 m). Finally, ostracode samples from turf-forming algae were more species rich than samples from other kinds of macroalgae. Since turf-forming algae are easily damaged by human trampling, this component of ostracode biodiversity may be particularly vulnerable to anthropogenic impacts on the intertidal habitat.

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Marine Holocene Ostracoda from the Pacific Coast of North and Central America

Cited by 39 publications

References 0 publications

Biota, palaeoenvironments and biostratigraphy of continental Oligocene deposits of the South German Molasse Basin (Penzberg Syncline)

Biota, palaeoenvironments and biostratigraphy of continental Oligocene deposits of the South German Molasse Basin (Penzberg Syncline)

Ostracoda (Crustacea) from the Archipelago of São Pedro and São Paulo, Equatorial Atlantic, with emphasis on a new Hemicytheridae genus

Intertidal meiofaunal biodiversity with respect to different algal habitats: a test using phytal ostracodes from Southern California

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