Oligodalatias jordani
Welton, 2016
Classification: Elasmobranchii Squaliformes Dalatiidae
Reference of the original description
A new dalatiid shark (Squaliformes: Dalatiidae) from the Early Oligocene of Oregon and California, USA. New Mexico Museum of Natural History and Science, Bulletin, 74, 289–302
A new dalatiid shark (Squaliformes: Dalatiidae) from the Early Oligocene of Oregon and California, USA. New Mexico Museum of Natural History and Science, Bulletin, 74, 289–302
Types
Oligodalatias jordani
Holotype: LACM(fossil): 115255; Paratype: LACM(fossil): 115256; LACM(fossil): 115257; LACM(fossil): 115258; LACM(fossil): 115259; LACM(fossil): 115260; LACM(fossil): 115261; LACM(fossil): 115262; LACM(fossil): 115263; LACM(fossil): 115265; LACM(fossil): 115262; NMMNHS: 115264; NMMNHS: 76664; NMMNHS: 76665; NMMNHS: 76666; NMMNHS: 76667; NMMNHS: 76668; NMMNHS: 76669; NMMNHS: 76670;
Oligodalatias jordani
Holotype: LACM(fossil): 115255; Paratype: LACM(fossil): 115256; LACM(fossil): 115257; LACM(fossil): 115258; LACM(fossil): 115259; LACM(fossil): 115260; LACM(fossil): 115261; LACM(fossil): 115262; LACM(fossil): 115263; LACM(fossil): 115265; LACM(fossil): 115262; NMMNHS: 115264; NMMNHS: 76664; NMMNHS: 76665; NMMNHS: 76666; NMMNHS: 76667; NMMNHS: 76668; NMMNHS: 76669; NMMNHS: 76670;
Description:
Citation: Oligodalatias jordani Welton, 2016: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 08/2026
Description
Original diagnosis after Welton, 2016 [24457]: A genus of Dalatiidae, having relatively large lower teeth (maximum tooth height 7.95 mm); differing from all other dalatiids, except Euprotomicroides, in having lower teeth with a non-bilobate apron (except in teeth near the distal end of the dental series in Oligodalatias), and a convex, weakly developed uvula (may also be weakly developed in Squaliodalatias); further differing from all other dalatiids, except Dalatias and Squaliodalatias, in having lower teeth with serrated cutting edges (smooth to finely serrated in Squaliodalatias) of the cusp and distal heel, and from all dalatiids in having a relatively robust lingual transverse bulge just below the crown base; differing further from Dalatias in having lower teeth lacking a mesial lingual foramen, and upper teeth with the lower axial foramen on the labial root face, just below the crown base; differing further from Squaliodalatias in lacking upper teeth with a distal heel; differing further from Angoumeius in having lower teeth with almost the entire mesial and distal root border involved in articulation with adjacent mesial and distal teeth in the dental series, mesial labial and distal labial foramina that are smaller than the lower axial foramen, upper teeth with nearly vertical cusps, no distal heel, and presence of the lower axial foramen on the labial root face, just beneath the crown base; differing further from Dalatias, Isistius, and Angoumeius, in lacking a boutonniere; differing further from Euprotomicroides in lacking a mesial lingual foramen, having mesial labial and distal labial foramina smaller then the lower axial foramen, and having semioblique cusps; differing further from Acrosqualiolus in lacking articulation in the upper teeth, and absence of a distal heel; further differing from Euprotomicrus and Squaliolus in having a distal labial foramen that is less developed than the lower axial foramen.
Original diagnosis after Welton, 2016 [24457]: A genus of Dalatiidae, having relatively large lower teeth (maximum tooth height 7.95 mm); differing from all other dalatiids, except Euprotomicroides, in having lower teeth with a non-bilobate apron (except in teeth near the distal end of the dental series in Oligodalatias), and a convex, weakly developed uvula (may also be weakly developed in Squaliodalatias); further differing from all other dalatiids, except Dalatias and Squaliodalatias, in having lower teeth with serrated cutting edges (smooth to finely serrated in Squaliodalatias) of the cusp and distal heel, and from all dalatiids in having a relatively robust lingual transverse bulge just below the crown base; differing further from Dalatias in having lower teeth lacking a mesial lingual foramen, and upper teeth with the lower axial foramen on the labial root face, just below the crown base; differing further from Squaliodalatias in lacking upper teeth with a distal heel; differing further from Angoumeius in having lower teeth with almost the entire mesial and distal root border involved in articulation with adjacent mesial and distal teeth in the dental series, mesial labial and distal labial foramina that are smaller than the lower axial foramen, upper teeth with nearly vertical cusps, no distal heel, and presence of the lower axial foramen on the labial root face, just beneath the crown base; differing further from Dalatias, Isistius, and Angoumeius, in lacking a boutonniere; differing further from Euprotomicroides in lacking a mesial lingual foramen, having mesial labial and distal labial foramina smaller then the lower axial foramen, and having semioblique cusps; differing further from Acrosqualiolus in lacking articulation in the upper teeth, and absence of a distal heel; further differing from Euprotomicrus and Squaliolus in having a distal labial foramen that is less developed than the lower axial foramen.
Remarks
shark-references Species-ID=4319;
type species of Oligodalatias Welton, 2016 [24457] by original designation (Art. 68.2 ICZN);
shark-references Species-ID=4319;
type species of Oligodalatias Welton, 2016 [24457] by original designation (Art. 68.2 ICZN);
References
Bioluminescence and repeated deep-sea colonization shaped the diversification and body size evolution of squaliform sharks. Proceedings of the Royal Society B-Biological Sciences, 292(2042), Article 20242932
DOI: 10.1098/rspb.2024.2932
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
A new dalatiid shark (Squaliformes: Dalatiidae) from the Early Oligocene of Oregon and California, USA. New Mexico Museum of Natural History and Science, Bulletin, 74, 289–302
Late Cretaceous and Cenozoic Squalomorphii of the Northwest Pacific Ocean. PhD, Univ. of California Berkeley, 553 p., 71 fig.
Bioluminescence and repeated deep-sea colonization shaped the diversification and body size evolution of squaliform sharks. Proceedings of the Royal Society B-Biological Sciences, 292(2042), Article 20242932
DOI: 10.1098/rspb.2024.2932
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
A new dalatiid shark (Squaliformes: Dalatiidae) from the Early Oligocene of Oregon and California, USA. New Mexico Museum of Natural History and Science, Bulletin, 74, 289–302
Late Cretaceous and Cenozoic Squalomorphii of the Northwest Pacific Ocean. PhD, Univ. of California Berkeley, 553 p., 71 fig.
