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Redescription of 'Amyzon' brevipinne and remarks on North American Eocene catostomids (Cypriniformes: Catostomidae).
- Source :
-
Journal of Systematic Palaeontology . May2021, Vol. 19 Issue 9, p677-689. 13p. - Publication Year :
- 2021
-
Abstract
- The Eocene catostomid fish (Cypriniformes: Catostomidae) from the Allenby Formation, British Columbia, Canada, is reviewed and revised based on recently collected specimens. The fish was originally recognized as a catostomid by Cope in 1893 and described as Amyzon brevipinne. Wilson comprehensively redescribed the species in 1977 based on a large collection. More specimens collected recently brought to light the need for a systematic revision of this species, different from all known Amyzon species in having a narrow frontal bone with elongated orbital notch, shallow and slender infraorbital series, broad opercle, and short and slender rib 4. It differs from the type species Amyzon mentale in having a shorter posteroventral process of the dentary and fewer dorsal fin rays. Given the differences from all known Eocene catostomid species, Amyzon brevipinne is herein assigned to a new genus as Wilsonium brevipinne. Phylogenetically, this species is resolved as the most basal taxon of Catostomidae. The small-sized fluvial specimens of Wilsonium brevipinne represent the first recognized dwarf catostomid species in the fossil record (maximum standard length ∼ 84 mm). It is also worth noting that Wilsonium gen. nov. differs from all known catostomids in the elongated orbital notch, shallow and slender infraorbital series and non-robust rib 4. These features are seen in some loaches and gyrinchelids. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CYPRINIFORMES
*FRONTAL bone
*FOSSILS
*EOCENE Epoch
*LOACHES
Subjects
Details
- Language :
- English
- ISSN :
- 14772019
- Volume :
- 19
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Journal of Systematic Palaeontology
- Publication Type :
- Academic Journal
- Accession number :
- 152758817
- Full Text :
- https://doi.org/10.1080/14772019.2021.1968966