Definitive specimens of Merlucciidae (Gadiformes) from the Eocene James Ross Basin of Isla Marambio (Seymour Island), Antarctic Peninsula
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...
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ftpcom:oai:digitalcommons.pcom.edu:scholarly_papers-1440 2023-09-05T13:13:22+02:00 Definitive specimens of Merlucciidae (Gadiformes) from the Eocene James Ross Basin of Isla Marambio (Seymour Island), Antarctic Peninsula Claeson, Kerin M. Eastman, Joseph T. MacPhee, Ross D. 2012-01-01T08:00:00Z https://digitalcommons.pcom.edu/scholarly_papers/317 unknown https://digitalcommons.pcom.edu/scholarly_papers/317 PCOM Scholarly Papers cod dentary hake Notothenioidei text 2012 ftpcom 2023-08-14T06:14:08Z 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. © Copyright 2012 Antarctic Science Ltd. Text Antarc* Antarctic Antarctic Peninsula Antarctica Arctic British Antarctic Survey Seymour Island Philadelphia College of Osteopathic Medicine: DigitalCommons@PCOM Antarctic Antarctic Peninsula Arctic Hake ENVELOPE(15.612,15.612,66.797,66.797) isla Marambio ENVELOPE(-56.635,-56.635,-64.239,-64.239) Marambio ENVELOPE(-56.750,-56.750,-64.283,-64.283) Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Seymour Island ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
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Open Polar |
collection |
Philadelphia College of Osteopathic Medicine: DigitalCommons@PCOM |
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ftpcom |
language |
unknown |
topic |
cod dentary hake Notothenioidei |
spellingShingle |
cod dentary hake Notothenioidei Claeson, Kerin M. Eastman, Joseph T. MacPhee, Ross D. Definitive specimens of Merlucciidae (Gadiformes) from the Eocene James Ross Basin of Isla Marambio (Seymour Island), Antarctic Peninsula |
topic_facet |
cod dentary hake Notothenioidei |
description |
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. © Copyright 2012 Antarctic Science Ltd. |
format |
Text |
author |
Claeson, Kerin M. Eastman, Joseph T. MacPhee, Ross D. |
author_facet |
Claeson, Kerin M. Eastman, Joseph T. MacPhee, Ross D. |
author_sort |
Claeson, Kerin M. |
title |
Definitive specimens of Merlucciidae (Gadiformes) from the Eocene James Ross Basin of Isla Marambio (Seymour Island), Antarctic Peninsula |
title_short |
Definitive specimens of Merlucciidae (Gadiformes) from the Eocene James Ross Basin of Isla Marambio (Seymour Island), Antarctic Peninsula |
title_full |
Definitive specimens of Merlucciidae (Gadiformes) from the Eocene James Ross Basin of Isla Marambio (Seymour Island), Antarctic Peninsula |
title_fullStr |
Definitive specimens of Merlucciidae (Gadiformes) from the Eocene James Ross Basin of Isla Marambio (Seymour Island), Antarctic Peninsula |
title_full_unstemmed |
Definitive specimens of Merlucciidae (Gadiformes) from the Eocene James Ross Basin of Isla Marambio (Seymour Island), Antarctic Peninsula |
title_sort |
definitive specimens of merlucciidae (gadiformes) from the eocene james ross basin of isla marambio (seymour island), antarctic peninsula |
publishDate |
2012 |
url |
https://digitalcommons.pcom.edu/scholarly_papers/317 |
long_lat |
ENVELOPE(15.612,15.612,66.797,66.797) ENVELOPE(-56.635,-56.635,-64.239,-64.239) ENVELOPE(-56.750,-56.750,-64.283,-64.283) ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(-56.750,-56.750,-64.283,-64.283) |
geographic |
Antarctic Antarctic Peninsula Arctic Hake isla Marambio Marambio Seymour Seymour Island |
geographic_facet |
Antarctic Antarctic Peninsula Arctic Hake isla Marambio Marambio Seymour Seymour Island |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Arctic British Antarctic Survey Seymour Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Arctic British Antarctic Survey Seymour Island |
op_source |
PCOM Scholarly Papers |
op_relation |
https://digitalcommons.pcom.edu/scholarly_papers/317 |
_version_ |
1776204668137897984 |