Browsing by Author "Kiel, Steffen"
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Item A late Paleocene fauna from shallow-water chemosynthesis-based ecosystems, Spitsbergen, Svalbard(Institute of Paleobiology, Polish Academy of Sciences, 2019) Hryniewicz, Krzysztof; Amano, Kazutaka; Bitner, Maria Aleksandra; Hagstrom, Jonas; Kiel, Steffen; Klompmaker, Adiel A.; Mors, Thomas; Robins, Cristina M.; Kaim, Andrzej; Polish Academy of Sciences; Institute of Paleobiology of the Polish Academy of Sciences; Joetsu University Education; Swedish Museum of Natural History; University of California System; University of California Berkeley; University of Alabama TuscaloosaWe present a systematic study of late Paleocene macrofauna from methane seep carbonates and associated driftwood in the shallow marine Basilika Formation, Spitsbergen, Svalbard. The fauna is composed of 22 taxa, comprising one brachiopod, 14 bivalves, three gastropods, three crustaceans, and one bony fish. The reported fish remains are among the first vertebrate body fossils from the Paleogene of Spitsbergen. One genus is new: the munidid decapod Valamunida Klompmaker and Robins gen. nov. Four new species are described: the terebratulide brachiopod Neoliothyrina nakremi Bitner sp. nov., the protobranch bivalve Yoldiella spitsbergensis Amano sp. nov., the xylophagain bivalve Xylophagella littlei Hryniewicz sp. nov., and the munidid decapod Valamunida haeggi Klompmaker and Robins gen. et sp. nov. New combinations are provided for the mytilid bivalve Inoperna plenicostata, the thyasirid bivalve Rhacothyas spitzbergensis, the ampullinid gastropod Globularia isfjordensis, and the munidid decapod Protomunida spitzbergica. Thirteen taxa are left in open nomenclature. The fauna contains a few last occurrences of Cretaceous survivors into the Paleocene, as well as first occurrences of Cenozoic taxa. It is composed of chemosymbiotic thyasirid bivalves and background species common in the northern Atlantic and Arctic during the Paleocene. Our results provide no evidence for a Paleocene origin of vesicomyid and bathymodiolin bivalves typical for Eocene and younger seep environments; instead, the Paleocene seeps of the Basilika Formation are more similar to their Late Cretaceous equi valents rich in thyasirids.Item Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru(Institute of Paleobiology, Polish Academy of Sciences, 2020) Kiel, Steffen; Hybertsen, Frida; Hyzny, Matus; Klompmaker, Adiel A.; Swedish Museum of Natural History; Comenius University Bratislava; University of California System; University of California Berkeley; University of Alabama TuscaloosaA total of 25 species of mollusks and crustaceans are reported from Oligocene seep deposits in the Talara Basin in northern Peru. Among these, 12 arc identified to the species-level, including one new genus, six new species, and three new combinations. Pseudophopsis is introduced for medium-sized, elongate-oval kalenterid bivalves with a strong hinge plate and largely reduced hinge teeth, rough surface sculpture and lacking a pallial sinus. The new species include two bivalves, three gastropods, and one decapod crustacean: the protobranch bivalve Neilo altamirano and the vesicomyid bivalve Pleurophopsis talarensis; among the gastropods, the pyropeltid Pyropelta seca, the provannid Provanna pelada, and the hokkaidoconchid Ascheria salina; the new crustacean is the callianassid Eucalliax capsulasetaea. New combinations include the bivalves Conchocele tessaria, Lucinoma zapotalensis, and Pseudophopsis peruviana. Two species are shared with late Eocene to Oligocene seep faunas in Washington state, USA: Provanna antiqua and Colus sekiuensis; the Talara Basin fauna shares only genera, but no species with Oligocene seep fauna in other regions. Further noteworthy aspects of the molluscan fauna include the remarkable diversity of four limpet species, the oldest record of the cocculinid Coccopigya, and the youngest record of the largely seep-restricted genus Ascheria. Eucalliax is recorded for the first time from a seep and from the Oligocene.