Late Jurassic fishes from longing gap, Antarctic Peninsula

Few records of Late Jurassic fishes have been reported previously from Antarctica. They include an indeterminate teleost from the Ameghino (Nordenskjöld) Formation at Longing Gap and two incomplete aspidorhyn-chiforms from James Ross Island, all of presumed Late Jurassic age. New fish material recen...

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Detalles Bibliográficos
Publicado: 2004
Materias:
fish
fossil
Jurassic
new genus
new species
Antarctic Peninsula
Antarctica
Graham Land
West Antarctica
Aspidorhynchiformes
Ichthyodectiformes
Pisces
teleost fish
Teleostei
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v24_n1_p41_Arratia
http://hdl.handle.net/20.500.12110/paper_02724634_v24_n1_p41_Arratia
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_02724634_v24_n1_p41_Arratia
record_format dspace
spelling paper:paper_02724634_v24_n1_p41_Arratia2023-06-08T15:25:09Z Late Jurassic fishes from longing gap, Antarctic Peninsula fish fossil Jurassic new genus new species Antarctic Peninsula Antarctica Graham Land West Antarctica Aspidorhynchiformes Ichthyodectiformes Pisces teleost fish Teleostei Few records of Late Jurassic fishes have been reported previously from Antarctica. They include an indeterminate teleost from the Ameghino (Nordenskjöld) Formation at Longing Gap and two incomplete aspidorhyn-chiforms from James Ross Island, all of presumed Late Jurassic age. New fish material recently recovered in the Upper Jurassic of Longing Gap is described. The new material consists of one piece of body squamation, which, based on the structure of the scales, corresponds to a new genus and species (Ameghinichthys antarcticus gen. et sp. nov.) of an indeterminate actinopterygian family; one aspidorhynchiform identified as Vinctifer sp. due to the structure and distribution of the scales; and numerous specimens of a new ichthyodectiform, Antarctithrissops seymouri gen. et sp. nov. This new genus differs from European ichthyodectiforms in the shape of the preopercle, the presence of long sensory preopercular branches almost reaching the posterior margin of the bone, and the uncommon structure of the scales, with a fine layer of bone obscuring the circuli. The presence of Vinctifer in the Antarctic is consistent with its other Gondwanan records. The Ichthyodectiformes, previously known from four European genera, extends the distribution of the group to the southernmost part of the Southern Hemisphere during the Late Jurassic. In contrast to most non-teleostean fishes, the known Late Jurassic teleosts apparently are species endemic to restricted areas in the Southern Hemisphere. © 2004 by the Society of Vertebrate Paleontology. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v24_n1_p41_Arratia http://hdl.handle.net/20.500.12110/paper_02724634_v24_n1_p41_Arratia
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic fish
fossil
Jurassic
new genus
new species
Antarctic Peninsula
Antarctica
Graham Land
West Antarctica
Aspidorhynchiformes
Ichthyodectiformes
Pisces
teleost fish
Teleostei
spellingShingle fish
fossil
Jurassic
new genus
new species
Antarctic Peninsula
Antarctica
Graham Land
West Antarctica
Aspidorhynchiformes
Ichthyodectiformes
Pisces
teleost fish
Teleostei
Late Jurassic fishes from longing gap, Antarctic Peninsula
topic_facet fish
fossil
Jurassic
new genus
new species
Antarctic Peninsula
Antarctica
Graham Land
West Antarctica
Aspidorhynchiformes
Ichthyodectiformes
Pisces
teleost fish
Teleostei
description Few records of Late Jurassic fishes have been reported previously from Antarctica. They include an indeterminate teleost from the Ameghino (Nordenskjöld) Formation at Longing Gap and two incomplete aspidorhyn-chiforms from James Ross Island, all of presumed Late Jurassic age. New fish material recently recovered in the Upper Jurassic of Longing Gap is described. The new material consists of one piece of body squamation, which, based on the structure of the scales, corresponds to a new genus and species (Ameghinichthys antarcticus gen. et sp. nov.) of an indeterminate actinopterygian family; one aspidorhynchiform identified as Vinctifer sp. due to the structure and distribution of the scales; and numerous specimens of a new ichthyodectiform, Antarctithrissops seymouri gen. et sp. nov. This new genus differs from European ichthyodectiforms in the shape of the preopercle, the presence of long sensory preopercular branches almost reaching the posterior margin of the bone, and the uncommon structure of the scales, with a fine layer of bone obscuring the circuli. The presence of Vinctifer in the Antarctic is consistent with its other Gondwanan records. The Ichthyodectiformes, previously known from four European genera, extends the distribution of the group to the southernmost part of the Southern Hemisphere during the Late Jurassic. In contrast to most non-teleostean fishes, the known Late Jurassic teleosts apparently are species endemic to restricted areas in the Southern Hemisphere. © 2004 by the Society of Vertebrate Paleontology.
title Late Jurassic fishes from longing gap, Antarctic Peninsula
title_short Late Jurassic fishes from longing gap, Antarctic Peninsula
title_full Late Jurassic fishes from longing gap, Antarctic Peninsula
title_fullStr Late Jurassic fishes from longing gap, Antarctic Peninsula
title_full_unstemmed Late Jurassic fishes from longing gap, Antarctic Peninsula
title_sort late jurassic fishes from longing gap, antarctic peninsula
publishDate 2004
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02724634_v24_n1_p41_Arratia
http://hdl.handle.net/20.500.12110/paper_02724634_v24_n1_p41_Arratia
_version_ 1768543843622322176

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