Description
Original diagnose after Pollerspöck & Straube, 2021 [30449]: The most frequent dentition in extant squaliform sharks is dignathic heterodont. We conclude that a strongly developed dignathic heterodonty as well as a disjunct monognathic heterodonty was present in the genus, but weaker than in other members of the clade. Upper jaw teeth are single-cusped; cusp (with exception of posterior or commissural teeth) slender, erected, nearly symmetrical, biconvex and comprising nearly two-thirds of tooth height; cutting edges always of different lengths, mesial always shorter than distal, never reaches the base of the cusp; posterior or commissural teeth strongly inclined distally with a low distal heel and straight mesial cutting edge; no ornamentation present; no apron present; labial usually no ridges at the base of the cusp; two root lobes, root low with short and rounded lobes, one central lingual foramen present, labial several foramina present. The teeth strongly resemble upper jaw teeth of extant dalatiid species. In contrast to the upper jaw teeth, lower jaw teeth are labiolingually compressed and show areas of overlap onto former neighbouring teeth; they are single cusped, with the exception of posterior or commissural teeth, broad, erected, convex mesial and strongly concave distal, continuous cutting edges, low straight or upturned distal heel present, distal cutting edge divided from distal heel by a notch, posterior or commissural teeth strongly inclined distally with a low distal heel and concave mesial cutting edge; no ornamentation present; no serration present, lingual base of enameloid straight, labial base of enameloid wavy, rectangular root, lingual basal groove absent, lingually one central foramen present, distally one large central foramen and several smaller foramina present, overlapping area to adjacent teeth present.

Remarks
shark-references Species-ID=16225;
valid after Pollerspöck & Straube, 2021 [30449];

References