Paracone bears a quite low
parastyle. An anterior cavity is crescent shaped and shallow, found between protocone and paracone.
PT was defined as '
parastyle' when it is located on upper molars and as 'protostylid' when it is located on lower molars (Dahlberg, 1945; Dahlberg, 1950).
P4 with distinct protocone, and an incipient to well-developed
parastyle. Mandible much elongated with diastemata between the premolars.
The preprotocrista runs from the protocone to the
parastyle, forming a wide shelf anterior to the paracone and preparacrista.
Occlusal surface of molars complex with labial and lingual styles; well-developed
parastyle and mesostyle, and protostyle and enterostyle (Fig.
Diagnosis.--Differs from all other Heptacodon (where known) in its smaller size and in having a moderately-developed mesiobuccal cingulum on the upper molar
parastyle and relatively greater buccal projection of
parastyle.
The
parastyle, mesostyle and metastyles are present labially.
The paracone rib lies close to the
parastyle. A strong entostyle is present in the upper molars (Fig.
The
parastyle is connected to the anteroloph, and separated from the protoloph by a wide and deep valley.
The preprotocrista is continuous with a precingulum extending to the
parastyle. The lingual cingulum is interrupted on the talon and at the base of the protocone.
The
parastyle is heavy, the mesostyle is high and the metastyle is incipient.