They have a carinated beak, pretty strongly curved, and a forked tail.
A shell characterized by a keel or keels is said to be carinated.
The carina is thick, measured from the inner convex to the exterior surface, which is carinated; heel prominent.
Male puparium white, narrow, carinated; length, about 1/36in.
Shell with regular, carinated, approximating, longitudinal ribs.
The neural arches are also noticeably thicker than in semijunctus, and the centra are rounded inferiorly rather than carinated.
Male puparium white, elongated, carinated; length, about 1/20in.
Male puparium rather longer than that of the female, the pellicle at one end; not carinated above.
Spire with carinated plaits, the interstices with slender, crowded, transverse grooves.
Male puparium white, elongated, carinated; pellicle at one end.
carinated car·i·nat·ed (kār'ə-nā'tĭd)
carinate car·i·nate (kār'ə-nāt', -nĭt)
Shaped like or having a carina or keel; ridged.