Strong radiating ribs are common in this group; and there are generally very strong plications or accordion-like folds on the pedicle although the delthyrium may be partially closed.
2.
Delthyrium wide, trapezoidal; lateral cavities narrow; dental plates long, beyond hinge zone, slightly divergent toward ventral floor at posterior parts and becoming parallel anteriorly; teeth short, very strong and massive, with expanded ends and crenulations; accessory denticulars and dental cavities present.
3.
No pedicle collar observed in sectioned specimens; delthyrium wide, trapezoidal to rectangular in shape; lateral cavities narrow and short; dental plates thick and long, beyond hinge zone and divergent to ventral floor, or subparallel; teeth fairly strong, massive and mallet-like, held tightly in sockets; accessory denticulars and dental cavities present.
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