Cosmoselachus mehlingi
Bronson, Pradel, Denton & Maisey, 2024
Classification: Holocephali Symmoriiformes Falcatidae
Reference of the original description
A new operculate symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale (Arkansas, United States). Geodiversitas, 46(4), 101–117
A new operculate symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale (Arkansas, United States). Geodiversitas, 46(4), 101–117
Description:
Citation: Cosmoselachus mehlingi Bronson, Pradel, Denton & Maisey, 2024: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 08/2026
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Description
Original diagnosis after Bronson, Pradel, Denton & Maisey, 2024 [32770]: Teeth small and cladodont type, with unfused bases and three lingually gently recurved cusps, set in elongate, scalloped Meckel’s cartilages that house widely spaced tooth families. Den¬ticles present between tooth families. Hyoid and branchial arches possess elongate rays, which are fused together to form a corrugated structure covering the gill openings.
The presence of ten upper and lower families of small cladodont teeth, widely spaced and housed in large alveoli, which, combined with phylogenetic analysis places the taxon within the family Falcatidae (Zangerl 1981; Ginter et al. 2010).
The presence of buccopharyngeal denticles that may be compound or single (insufficient resolution in CT scan to determine their type), scalloped jaw margins, and tentatively a single canal for the dorsal aorta entering the basicranium, combined with symplesiomorphic characters (such as possessing 15-18 distal fin radials and cladodont teeth, the shape of the basicranium [see Description], and elongate jaws), as well as the results of a phylogenetic analysis, place this taxon within Order Symmoriiformes (Coates & Sequeira 2001; Maisey 2007).
Original diagnosis after Bronson, Pradel, Denton & Maisey, 2024 [32770]: Teeth small and cladodont type, with unfused bases and three lingually gently recurved cusps, set in elongate, scalloped Meckel’s cartilages that house widely spaced tooth families. Den¬ticles present between tooth families. Hyoid and branchial arches possess elongate rays, which are fused together to form a corrugated structure covering the gill openings.
The presence of ten upper and lower families of small cladodont teeth, widely spaced and housed in large alveoli, which, combined with phylogenetic analysis places the taxon within the family Falcatidae (Zangerl 1981; Ginter et al. 2010).
The presence of buccopharyngeal denticles that may be compound or single (insufficient resolution in CT scan to determine their type), scalloped jaw margins, and tentatively a single canal for the dorsal aorta entering the basicranium, combined with symplesiomorphic characters (such as possessing 15-18 distal fin radials and cladodont teeth, the shape of the basicranium [see Description], and elongate jaws), as well as the results of a phylogenetic analysis, place this taxon within Order Symmoriiformes (Coates & Sequeira 2001; Maisey 2007).
Remarks
shark-references Species-ID=17201;
type species of Cosmoselachus Bronson, Pradel, Denton & Maisey, 2024 [32770] by monotypy (Art. 68.3 ICZN);
shark-references Species-ID=17201;
type species of Cosmoselachus Bronson, Pradel, Denton & Maisey, 2024 [32770] by monotypy (Art. 68.3 ICZN);
References
Vertebrate assemblage and depositional environment of the Fayetteville Shale (Upper Mississippian, middle Chesterian). Geobios, 94, in press
DOI: 10.1016/j.geobios.2025.11.002
Vertebrate assemblage and depositional environment of the Fayetteville Shale (Upper Mississippian, middle Chesterian). Geobios, 94, in press
DOI: 10.1016/j.geobios.2025.11.002
