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Showing results for tags 'atractosteus'.
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From the album: Aguja Formation
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From the album: Aguja Formation
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Atractosteus simplex and A. atrox occur mainly in Fossil Lake deposits where they are relatively rare (less than 0.05% of the fish fauna). The long snouted gars are much rarer in Lake Gosiute and Lake Uinta deposits. Taxonomy from Fossilworks.org. Emended species diagnosis from Grande 2010, p. 471: “†Atractosteus simplex differs from other species in the genus by the following characters A-E. (A) Having a lower number of lateral line scales than any other species except for †A. messelensis sp. nov. (Table 184). (B) Having a lower number of abdominal vertebrae than any other species except for †A. messelensis sp. nov. (Table 182). (C) Differs from †A. messelensis sp. nov. in having a shorter premaxilla relative to head length (Table 180). (D) Differs from †A. messelensis sp. nov. in having a shorter head relative to standard length (Table 180). (E) differs from A. spatula and A. tristoechus in that the dermosphenotic forms part of the orbital margin as in A. tropicus." Line drawing from Grande 2010, p. 475 : Identified by oilshale. References: Grande, L. (2001) An Updated Review of the Fish Faunas From the Green River Formation, the World’s Most Productive Freshwater Lagerstätten. Eocene Biodiversity, 1–38. doi:10.1007/978-1-4615-1271-4_1 . Grande, L., Kammerer, Ch. & Westneat, M. (2006) Comparative and Developmental Functional Morphology of the Jaws of Living and Fossil Gars. // Journal of Morphology, Vol 267, Issue 9, 1017-1031. Grande, L. (2010) An Empirical Synthetic Pattern Study of Gars (Lepisosteiformes) and closely related Species, based mostly on Skeletal Anatomy. The Resurrection of Holostei.// Copeia, 2010, No 2A, 1-863.
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From the album: Moscow region Late Jurassic vertebrates
Probably Atractosteus, 7 mm, Fili Park, Volgian-Nikitini zone-
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From the album: Vertebrates
Atracosteus simplex (Leidy, 1873) former name: Lepisosteus simplex Middle Eocene Green River Formation Kemmerer Wyoming USA Length 40 cm-
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With 13cm SL a relatively small Atractosteus - the average length is probably about 26cm. Adult specimens exceed 60cm in length. Invalid names: Atractosteus strausi and A. kinkelini Quote from Grande, 2010: "In a redescription of the species of Atractosteus from Messel, Gaudant (2005) correctly noted that the name A. strausi (Kinkelin), 1884, based on an isolated ganoid scale "devoid of any diagnostic character" found in Miocene deposits of Frankfurt-Niederrad, cannot be applied to either of the Messel gar species because the name is inapplicable and a nomen dubium (he used nomen vanum but the International Code does not recognize this sometimes ambiguously defined term, so I follow Chorn and Whetstone (1978) and others in using nomen dubium). Gaudant (2005) offered a replacement name for A. strausi (A. kinkelini) but unfortunately, he did not clearly designate a validly diagnosable holotype for the new name. He instead chose a skull fragment (SMF P. 1676, consisting of several lacrimomaxillae and a partial dentary) to serve as a "Lectotype" (p. 131) for A. strausi, and holotype (caption for fig. 2, p. 112) for A. kinkelini. He stated that the "[reduced number of infraorbitals]" is the diagnostic feature of this specimen, but the specimen is missing its anterior end making a complete count of lacrimomaxillary bones (his "infraorbitals") impossible. The count of lacrimomaxillary bones in the Messel Atractosteus also falls completely within the ranges of A. spatula, A. tristoechus and A. simplex (Table 181). Therefore, this species is not differentiated with an applicable diagnosis. Also, the fragmentary type, like the Kinkelin scale, is "devoid of any diagnostic character." Therefore a new name is erected here for the Messel Atractosteus (Atractosteus messelensis sp. nov.) with a unique combination of characters to diagnose it and a nearly complete specimen as holotype." References: Grande, L. (2010) An empirical synthetic pattern study of gars (Lepisosteiformes) and closely related species, based mostly on skeletal anatomy. The resurrection of Holostei. American Society of Ichthyologists and Herpetologists, Copeia, Special Publication 6, Supplementary Issue, 10(2A):1-871
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From the album: Vertebrates
Atracosteus simplex (Leidy, 1873) former name: Lepisosteus simplex Middle Eocene Green River Formation Kemmerer Wyoming USA Length 29"/ 73cm- 6 comments
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From the album: Vertebrates
Atractosteus messelensis Grande, 2010 (old name: Atractosteus strausi Kinkelin 1884) Eocene Lutetian Messel near Darmstadt Germany Length 81cm / 32 inch-
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From the album: Vertebrates
Atractosteus messelensis Grande, 2010 (old name: Atractosteus strausi Kinkelin 1884) Eocene Lutetian Messel near Darmstadt Germany Length 22cm