Somniosus gonzalezi
Welton & Goedert, 2016
Classification: Elasmobranchii Squaliformes Somniosidae
Reference of the original description
New fossil species of Somniosus and Rhinoscymnus (Squaliformes: Somniosidae), deep water sharks from Oligocene rocks of Western Washington State, USA. New Mexico Museum of Natural History and Science, Bulletin, 74, 309–326
New fossil species of Somniosus and Rhinoscymnus (Squaliformes: Somniosidae), deep water sharks from Oligocene rocks of Western Washington State, USA. New Mexico Museum of Natural History and Science, Bulletin, 74, 309–326
Types
Somniosus gonzalezi
Holotype: USNM.: 559335; Paratype: USNM.: 559336; USNM.: 559337; USNM.: 559338;
Somniosus gonzalezi
Holotype: USNM.: 559335; Paratype: USNM.: 559336; USNM.: 559337; USNM.: 559338;
Description:
Citation: Somniosus gonzalezi Welton & Goedert, 2016: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 11/2024
Description
Original diagnose after Welton & Goedert (2016) p. 319 [24455]: A species of Somniosus differing from adult S. microcephalus and S. pacificus by having lower teeth, from the mesial half of the dental series, with a straight mesial crown cutting edge; distobasally sloping distal heel; broad, convex distal tooth border, continuous from crown to base of root; distolingual foramen very small; wide distolingual articular facet; mesolabial crown base projected basally and lobate; mesolabial crown base smoothly convex apically, between apron and mesial edge of tooth; distolabial foramen only slightly enlarged; upper teeth: root width greater than height; root weakly bilobate; lingual groove narrow; basal notch shallow; further differing from lower anteroposterior teeth of S. pacificus by having: short, broadly triangular cusp; moderately well developed, bifid uvula with a deep axial trough; smaller infindibulum; narrower lingual groove; further differing from lower anteroposterior teeth of S. microcephalus by having: a lower cusp angle; distal extension of cusp apex 39 to 46 % of heel length; smaller mesolingual and mesolabial foramina.
Original diagnose after Welton & Goedert (2016) p. 319 [24455]: A species of Somniosus differing from adult S. microcephalus and S. pacificus by having lower teeth, from the mesial half of the dental series, with a straight mesial crown cutting edge; distobasally sloping distal heel; broad, convex distal tooth border, continuous from crown to base of root; distolingual foramen very small; wide distolingual articular facet; mesolabial crown base projected basally and lobate; mesolabial crown base smoothly convex apically, between apron and mesial edge of tooth; distolabial foramen only slightly enlarged; upper teeth: root width greater than height; root weakly bilobate; lingual groove narrow; basal notch shallow; further differing from lower anteroposterior teeth of S. pacificus by having: short, broadly triangular cusp; moderately well developed, bifid uvula with a deep axial trough; smaller infindibulum; narrower lingual groove; further differing from lower anteroposterior teeth of S. microcephalus by having: a lower cusp angle; distal extension of cusp apex 39 to 46 % of heel length; smaller mesolingual and mesolabial foramina.
References
Of teeth and trees: A fossil tip-dating approach to infer divergence times of extinct and extant squaliform sharks. Zoologica Scripta, 47(5), 539–557
DOI: 10.1111/zsc.12299
New fossil species of Somniosus and Rhinoscymnus (Squaliformes: Somniosidae), deep water sharks from Oligocene rocks of Western Washington State, USA. New Mexico Museum of Natural History and Science, Bulletin, 74, 309–326
Of teeth and trees: A fossil tip-dating approach to infer divergence times of extinct and extant squaliform sharks. Zoologica Scripta, 47(5), 539–557
DOI: 10.1111/zsc.12299
New fossil species of Somniosus and Rhinoscymnus (Squaliformes: Somniosidae), deep water sharks from Oligocene rocks of Western Washington State, USA. New Mexico Museum of Natural History and Science, Bulletin, 74, 309–326
