The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA)
Shark rostral nodes from the Yorktown Formation (Zanclean, early Pliocene) of Lee Creek Mine, North Carolina (USA), previously assigned to the genus Lamna Cuvier, 1816, have been reinterpreted using a preliminary identification key for extant Lamniformes based on rostral morphology. In addition, the...
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ftjgq:oai:geojournals.pgi.gov.pl:article/9609 2024-09-15T18:17:22+00:00 The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA) Mollen, Frederik H. Jagt, John W.M. 2012-03-30 application/pdf https://gq.pgi.gov.pl/agp/article/view/9609 eng eng Faculty of Geology University of Warsaw https://gq.pgi.gov.pl/agp/article/view/9609/8153 https://gq.pgi.gov.pl/agp/article/view/9609 Acta Geologica Polonica; Vol. 62 No. 1 (2012); 117–127 Acta Geologica Polonica; Tom 62 Nr 1 (2012); 117–127 Lamnidae Otodontidae Lamna nasus Lamna di t ropi s Carcharodon Cosmopol i todus Megas e lachus Parotodus Ros t rum Ros t r a l node CT scans info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2012 ftjgq 2024-07-30T03:29:09Z Shark rostral nodes from the Yorktown Formation (Zanclean, early Pliocene) of Lee Creek Mine, North Carolina (USA), previously assigned to the genus Lamna Cuvier, 1816, have been reinterpreted using a preliminary identification key for extant Lamniformes based on rostral morphology. In addition, the fossil rostral nodes have been compared in detail with Recent material of both the porbeagle, Lamna nasus (Bonnaterre, 1788) and the salmon shark, Lamna ditropis Hubbs & Follet, 1947. Despite the fact that the rostra compared relatively well with those of Recent Lamna, the Lee Creek Mine specimens proved to differ significantly in having near-parallel lateral rostral cartilages that join the rostral node individually, instead of abutting ones. Based on this observation, we here propose to strike the genus Lamna from the Lee Creek Mine faunal list, so long as no other diagnostic material is forthcoming. These partially preserved rostra are likely to have belonged to extinct taxa within the families Lamnidae or Otodontidae, both of which have been documented from the Yorktown Formation on the basis of isolated teeth of at least three species, Cosmopolitodus hastalis (Agassiz, 1838), Megaselachus megalodon (Agassiz, 1835) and Parotodus benedenii (Le Hon, 1871). Article in Journal/Newspaper Lamna nasus Porbeagle Geological Quarterly |
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Open Polar |
collection |
Geological Quarterly |
op_collection_id |
ftjgq |
language |
English |
topic |
Lamnidae Otodontidae Lamna nasus Lamna di t ropi s Carcharodon Cosmopol i todus Megas e lachus Parotodus Ros t rum Ros t r a l node CT scans |
spellingShingle |
Lamnidae Otodontidae Lamna nasus Lamna di t ropi s Carcharodon Cosmopol i todus Megas e lachus Parotodus Ros t rum Ros t r a l node CT scans Mollen, Frederik H. Jagt, John W.M. The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA) |
topic_facet |
Lamnidae Otodontidae Lamna nasus Lamna di t ropi s Carcharodon Cosmopol i todus Megas e lachus Parotodus Ros t rum Ros t r a l node CT scans |
description |
Shark rostral nodes from the Yorktown Formation (Zanclean, early Pliocene) of Lee Creek Mine, North Carolina (USA), previously assigned to the genus Lamna Cuvier, 1816, have been reinterpreted using a preliminary identification key for extant Lamniformes based on rostral morphology. In addition, the fossil rostral nodes have been compared in detail with Recent material of both the porbeagle, Lamna nasus (Bonnaterre, 1788) and the salmon shark, Lamna ditropis Hubbs & Follet, 1947. Despite the fact that the rostra compared relatively well with those of Recent Lamna, the Lee Creek Mine specimens proved to differ significantly in having near-parallel lateral rostral cartilages that join the rostral node individually, instead of abutting ones. Based on this observation, we here propose to strike the genus Lamna from the Lee Creek Mine faunal list, so long as no other diagnostic material is forthcoming. These partially preserved rostra are likely to have belonged to extinct taxa within the families Lamnidae or Otodontidae, both of which have been documented from the Yorktown Formation on the basis of isolated teeth of at least three species, Cosmopolitodus hastalis (Agassiz, 1838), Megaselachus megalodon (Agassiz, 1835) and Parotodus benedenii (Le Hon, 1871). |
format |
Article in Journal/Newspaper |
author |
Mollen, Frederik H. Jagt, John W.M. |
author_facet |
Mollen, Frederik H. Jagt, John W.M. |
author_sort |
Mollen, Frederik H. |
title |
The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA) |
title_short |
The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA) |
title_full |
The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA) |
title_fullStr |
The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA) |
title_full_unstemmed |
The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA) |
title_sort |
taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus lamna (lamniformes, lamnidae) from the pliocene of lee creek mine, north carolina (usa) |
publisher |
Faculty of Geology University of Warsaw |
publishDate |
2012 |
url |
https://gq.pgi.gov.pl/agp/article/view/9609 |
genre |
Lamna nasus Porbeagle |
genre_facet |
Lamna nasus Porbeagle |
op_source |
Acta Geologica Polonica; Vol. 62 No. 1 (2012); 117–127 Acta Geologica Polonica; Tom 62 Nr 1 (2012); 117–127 |
op_relation |
https://gq.pgi.gov.pl/agp/article/view/9609/8153 https://gq.pgi.gov.pl/agp/article/view/9609 |
_version_ |
1810455386828832768 |