Diagnoza

The species is founded on a single lateral tooth from the upper jaw.
The length is about 13 mm., the height from the lower margin of the root
to the tip of the principal cone is about 7 mm.., and the height of the princi-
pal cone above the root is about 4 mm.

The principal cone is preceded by a group of 3 or 4 denticles, the first
of Which is comparativcly large, but. all decrease rapidly in size as they ap-
proach the root, giving somewhat the effect of a miniature cockscom'b.

The principal cone is followed by four accessory cones which are all the
same size, and a fifth accessory cone which is very small. There is an in-
dication of a denticle at the extreme posterior end.

The cutting edges of the tooth are entire, and are so thin as to be almost translucent.

The tooth is similarly convex on both the inner and outer sides, and is
well compressed.

The root is straight on the outer side, convcx on the inner, with the base
tapering to a thickness about equal to that at. the base of the crown, so
that in profile the root is roughly the shape of a half circle.

The tooth as a whole is very slightly twisted, but the concs and dcnticles
are set straight on the root, and are not at all sigmoid.

Porównanie

Autekologia

nektonic carnivore

Występowanie geograficzne

Zasięg czasowy

Eocene, Oligocene

Materiały muzealne

JD2.1, JD2.2, JD2.K.156, JD2.K.157, JD2.LG.35, JD2.P.1

Literatura

Reed, M. D. 1946. New species of fossil shark from New Jersey. Notulae Naturae 172:1-4.

http://fossilworks.org/bridge.pl?a=taxonInfo&taxon_no=285228