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5 results for “Cosmoselachus”
FIG. 5. — Cosmoselachus mehlingi n. gen., n in A new operculate symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale (Arkansas, United States)
FIG. 5. — Cosmoselachus mehlingi n. gen., n. sp., specimen AMNH FF 20509: A, cross section through the posterior half of the specimen, at the point indicated by the inset 3D reconstruction, showing multilayered opercular structure made of cartilaginous branchial rays, fused to one another. Layer of rays from the first branchial arch (behind the hyoid arch) indicated by the second-from-left arrowhead. The right-most arrowhead marks the second row of pharyngeal rays (first branchial arch); another layer (second branchial arch) can be found just beneath it (second arrowhead from the right). Hyoid operculum appears to fold at the arrowhead furthest to the left; B, longitudinal section of posterior half of AMNH FF 20509 showing hyoid operculum (right-most arrowhead) and additional elongate branchial rays (left two arrowheads). Anterior to left, slice location within the specimen indicated by 3D reconstruction in the upper right corner. Scale bars: 5 cm.
FIG. 2. — Cosmoselachus mehlingi n. gen., n in A new operculate symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale (Arkansas, United States)
FIG. 2. — Cosmoselachus mehlingi n. gen., n. sp., three-dimensional renderings of specimen AMNH FF 20509, produced by computed tomographic (CT) scanning: A, ventral view of posterior half of specimen, anterior to top; B, ventral view of anterior part of the specimen, anterior to right, with opercular elements removed; C, dorsal view of anterior half of specimen, anterior to right. Note loss of anterior portion of cranium due to taphonomy. Abbreviations: add, depression potentially for adductor musculature; c, cranium; cb, ceratobranchials; ch, ceratohyals; d, denticles; mc, Meckel's cartilage; op, opercular cartilage; pa f, pharyngeal arch fragments; pq, palatoquadrate fragment; t, teeth. Scale bars: 5 cm.
FIG. 1. — Cosmoselachus mehlingi n. gen., n in A new operculate symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale (Arkansas, United States)
FIG. 1. — Cosmoselachus mehlingi n. gen., n. sp., specimen AMNH FF 20509, anterior to right: A, entire specimen, ventral view. Abbreviations: mc, Meckel's cartilage; op, opercular flap; B, detail of opercular flap. Scale bars: A, 5 cm; B, 2 cm. Photographs by Lorraine Meeker.
FIG. 6. — Cosmoselachus mehlingi n. gen., n in A new operculate symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale (Arkansas, United States)
FIG. 6. — Cosmoselachus mehlingi n. gen., n. sp., partial basicranium of specimen AMNH FF 20509: A, dorsal view; B, ventral view. Anterior to top. Abbreviations: da?, possible opening for the dorsal aorta; occ, occiput; ot cap, otic capsule. Scale bar: 3 cm.
FIG. 4. — Cosmoselachus mehlingi n. gen., n in A new operculate symmoriiform chondrichthyan from the Late Mississippian Fayetteville Shale (Arkansas, United States)
FIG. 4. — Cosmoselachus mehlingi n. gen., n. sp., specimen AMNH FF 20509, pharyngeal denticles (arrowhead) revealed by CT scanning. Anterior to top, ventral view in frontal section. Scale bar: 2 cm.
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