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Article: A Paleocene (Danian) marine osteoglossid (Teleostei, Osteoglossomorpha) from the Nuussuaq Basin of Greenland, with a brief review of Palaeogene marine bonytongue fishes

Papers in Palaeontology - Volume 7 Issue 1 - Cover
Publication: Palaeontology
Volume: 7
Part: 1
Publication Date: Febuary 2021
Page(s): 625 640
Author(s): Alessio Capobianco, Ethan Foreman, and Matt Friedman
DOI: 10.1002/spp2.1291
Addition Information

How to Cite

CAPOBIANCO, A., FOREMAN, E., FRIEDMAN, M. 2021. . Papers in Palaeontology, 7, 1, 625-640. DOI: /doi/10.1002/spp2.1291

Author Information

  • Alessio Capobianco - Museum of Paleontology & Department of Earth & Environmental Sciences University of Michigan 1105 N. University Avenue Ann Arbor MI 48109‐1085 USA
  • Ethan Foreman - College of Engineering University of Michigan 1221 Beal Avenue Ann Arbor MI 48109‐2102 USA
  • Matt Friedman - Museum of Paleontology & Department of Earth & Environmental Sciences University of Michigan 1105 N. University Avenue Ann Arbor MI 48109‐1085 USA

Publication History

  • Issue published online: 08 March 2021
  • Manuscript Accepted: 17 August 2019
  • Manuscript Received: 02 April 2019

Funded By

Society of Systematic Biologists 2017 SSB Graduate Student Research Award
Department of Earth & Environmental Sciences, University of Michigan, Scott Turner Student Research Grant Award 2017

Online Version Hosted By

Wiley Online Library
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Abstract

The early Palaeogene represents a key interval in the evolution of modern marine fish faunas. Together with the first appearances of many familiar fish lineages characteristic of contemporary marine environments, early Palaeogene marine deposits worldwide feature the occurrence of osteoglossid bonytongues. Their presence in marine rocks is surprising, given that these fishes are strictly associated with freshwater environments in modern settings and in other parts of the fossil record. Despite its possible relevance to faunal recovery after the Cretaceous–Palaeogene (K–Pg) extinction, this marine osteoglossid radiation is relatively understudied. Here we describe an osteoglossid specimen from marine Danian deposits of western Greenland (Eqalulik Formation, northern Nuussuaq Peninsula). It consists of disarticulated cranial, pectoral and vertebral material belonging to a relatively large‐bodied predator, similar to the widespread †Brychaetus but with some distinctive features. This specimen expands the geographical range of extinct osteoglossids to the Arctic and represents one of the earliest records of this group in marine deposits. We review other fossil occurrences of marine osteoglossids, highlighting temporal and biogeographical patterns that characterize their rise, diversification and sudden disappearance in the middle Eocene. It is likely that the transition from freshwater to marine environments occurred around the K–Pg boundary, possibly related to ecological replacement of predatory fish lineages that went extinct at the end of the Cretaceous. Further study of the Eqalulik Formation fauna could yield additional insight into the consequences of the end‐Cretaceous extinction with regard to marine fish evolution and the assembly of modern marine faunas.

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