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IRMNG name detailsArnognathus Broom, 1907 †
1184952 (urn:lsid:irmng.org:taxname:1184952)
uncertain > nomen dubium
Genus
fossil only
Trans. S. Afr. Phil. Soc., 18
page(s): 31 [details]
Taxonomic remark From Kammerer, 2023: s. Broom (1907) based Arnognathus parvidens on a single right dentary exposed in lateral view, which...
Taxonomic remark From Kammerer, 2023: s. Broom (1907) based Arnognathus parvidens on a single right dentary exposed in lateral view, which he considered most similar to Ictidosuchus primaevus, but distinguished from it by the more prominent dentary angle. Ictidosuchus is a eutherocephalian (Huttenlocker 2009), and all subsequent coverage of Arnognathus treated it as a member of what would today be called Eutherocephalia, and specifically Baurioidea (see e.g. Haughton 1924; Haughton & Brink 1955; Romer 1956). However, van den Heever (1987) noted that SAM-PK-1069 has serrated postcanines, a typical feature of early therocephalians that is not present in eutherocephalians ... The dentary of Arnognathus clearly differs from the ‘hourglass’ shape of Scylacosaurus and lacks the strong posterior cant to the postcanines of Pristerognathus, but otherwise could belong to any scylacosaurid, and here is considered a nomen dubium (Scylacosauridae indet.). [details]
IRMNG (2023). Arnognathus Broom, 1907 †. Accessed at: https://www.irmng.org/aphia.php?p=taxdetails&id=1184952 on 2025-03-25
Date action by
original description
Trans. S. Afr. Phil. Soc., 18
page(s): 31 [details] basis of record Neave, S. A. and successors. (1939-2004). Nomenclator Zoologicus, vols. 1-10 online. [developed by uBio, hosted online at MBLWHOI Library]. Previously at http://ubio.org/NomenclatorZoologicus/ (URL no longer current). , available online at https://insecta.bio.spbu.ru/z/nomenclator_zoologicus_PDF.htm [details] status source Kammerer, C. F. (2023). Revision of the Scylacosauridae (Therapsida: Therocephalia). <em>Palaeontologia Africana.</em> 56: 51-87., available online at https://hdl.handle.net/10539/35700 [details] verified source for family Kammerer, C. F. (2023). Revision of the Scylacosauridae (Therapsida: Therocephalia). <em>Palaeontologia Africana.</em> 56: 51-87., available online at https://hdl.handle.net/10539/35700 [details] name verified source Neave, S. A. and successors. (1939-2004). Nomenclator Zoologicus, vols. 1-10 online. [developed by uBio, hosted online at MBLWHOI Library]. Previously at http://ubio.org/NomenclatorZoologicus/ (URL no longer current). , available online at https://insecta.bio.spbu.ru/z/nomenclator_zoologicus_PDF.htm [details] extant flag source Kammerer, C. F. (2023). Revision of the Scylacosauridae (Therapsida: Therocephalia). <em>Palaeontologia Africana.</em> 56: 51-87., available online at https://hdl.handle.net/10539/35700 [details] Unreviewed
Taxonomic remark From Kammerer, 2023: s. Broom (1907) based Arnognathus parvidens on a single right dentary exposed in lateral view, which he considered most similar to Ictidosuchus primaevus, but distinguished from it by the more prominent dentary angle. Ictidosuchus is a eutherocephalian (Huttenlocker 2009), and all subsequent coverage of Arnognathus treated it as a member of what would today be called Eutherocephalia, and specifically Baurioidea (see e.g. Haughton 1924; Haughton & Brink 1955; Romer 1956). However, van den Heever (1987) noted that SAM-PK-1069 has serrated postcanines, a typical feature of early therocephalians that is not present in eutherocephalians ... The dentary of Arnognathus clearly differs from the ‘hourglass’ shape of Scylacosaurus and lacks the strong posterior cant to the postcanines of Pristerognathus, but otherwise could belong to any scylacosaurid, and here is considered a nomen dubium (Scylacosauridae indet.). [details]
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