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    Schwarzhans, Werner Mörs, Thomas Engelbrecht, Andrea Reguero, Marcelo and Kriwet, Jürgen 2016. Before the freeze: otoliths from the Eocene of Seymour Island, Antarctica, reveal dominance of gadiform fishes (Teleostei). Journal of Systematic Palaeontology, p. 1.


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Definitive specimens of Merlucciidae (Gadiformes) from the Eocene James Ross Basin of Isla Marambio (Seymour Island), Antarctic Peninsula

  • Kerin M. Claeson (a1), Joseph T. Eastman (a1) and Ross D. E. Macphee (a2)
  • DOI: http://dx.doi.org/10.1017/S0954102012000247
  • Published online: 14 May 2012
Abstract
Abstract

An isolated partial right dentary (BAS D.515.2) collected by the British Antarctic Survey prompted a re-evaluation of gadiform remains from the La Meseta Formation (conventionally middle Eocene) of Isla Marambio (Seymour Island), Antarctic Peninsula. Modern gadiforms (hakes and cods) range from the Arctic to Antarctic, inhabiting deep sea benthic, shore, estuarine, and freshwater environments. Based on a fossil record primarily composed of otoliths, they are known to extend back to the Eocene and Oligocene. The new specimen was recovered from the fossil penguin locality D.515. It is characterized by a single row of sharp, ankylosed teeth set upon robust bony pedestals. The surface anterior to the mental foramen exhibits ascending and descending ridges with slightly rugose texture. The ascending ridge is fractured, but partially covers the lateral aspect of the tooth row. BAS D.515.2 is unlike the dentary of macrourid gadiforms, also recovered from the Eocene of Antarctica. BAS D.515.2 preserves several features similar to previously published accounts of the gadiform “†Mesetaichthys” from Isla Marambio. These specimens are probably the same taxon and their combined character suite indicates it is a member of Merluccidae. Thus, these are the only non-otolithic skeletal specimens of an Eocene hake known outside of the London Clay's †Rhinocephalus.

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claeson@ohio.edu
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

J.A. Case 1992. Evidence from fossil vertebrates for a rich Eocene Antarctic marine environment. Antarctic Research Series, 56, 119130.

J.T. Eastman L. Grande 1989. Evolution of the Antarctic fish fauna with emphasis on the Recent notothenioids. InCrame, J.A.,ed.Origins and evolution of the Antarctic biota. Geological Society Special Publication, No. 47, 241252.

W.L. Fink 1981. Ontogeny and phylogeny of tooth attachment modes in actinopterygian fishes. Journal of Morphology, 167, 167184.

L.C. Ivany , K.C. Lohmann , F. Hasiuk , D.B. Blake , A. Glass , R.B. Aronson R.M. Moody 2008. Eocene climate record of a high southern latitude continental shelf: Seymour Island, Antarctica. Geological Society of America Bulletin, 120, 659678.

J. Kriwet T. Hecht 2008. A review of early gadiform evolution and diversification: first record of a rattail fish skull (Gadiformes, Macrouridae) from the Eocene of Antarctica, with otoliths preserved in situ. Naturwissenschaften, 95, 899907.

P.M. Sadler 1988. Geometry and stratification of uppermost Cretaceous and Paleogene units on Seymour Island, northern Antarctica Peninsula. InFeldmann, R.M. & Woodburne, M.O., eds. Geology and paleontology of Seymour Island, Antarctic Peninsula.Geological Society of America Memoir, No. 169, 303448.

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Antarctic Science
  • ISSN: 0954-1020
  • EISSN: 1365-2079
  • URL: /core/journals/antarctic-science
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