Fig. 18 in Freshwater Stingrays Of The Green River Formation Of Wyoming (Early Eocene), With The Description Of A New Genus And Species And An Analysis Of Its Phylogenetic Relationships (Chondrichthyes: Myliobatiformes)

Fig. 18. Neurocranium and visceral arches of †Asterotrygon maloneyi, n.gen., n.sp. (FMNH PF 12989, adult male paratype; entire specimen in fig. 4). A. Ventrally exposed splanchnocranium. B. Schematic outline of neurocranium from same specimen. Note intense, almost uniform covering of closely packed and very small dermal denticles, which are more visible anterior to neurocranium between pectoral radials. Larger denticles are obliterating postorbital processes. Only impressions in the matrix of the putative angular cartilage(s) (aac?) remain, and they are not clearly visible in the photograph (A). Note that hyomandibula on right side lacks a large central section of prismatic calcification, and that portions of nasal capsules, jaws, neurocranium, and gill arches are missing. Anterior to top.