-
relatively small median sinus in the
upper margin of the aperture, and
collabral (transverse) or
spiral (longitudinal)
threads covering the s****. The...
- soft body in
these species. The
conical s**** has
peripheral carina and
collabral axial riblets. All
whorls contain midwhorl angulation but
spiral lirae...
- half-whorl. The
sculpture consists of
strong spiral lirae or
cords with fine
collabral threads crossing spiral lirae. It
often contains a
peripheral keel but...
-
surrounding its aperture, and
instead possesses a thin
peristome with a
collabral callus ridge on the
palatal wall. In all of the
specimens studied, a broad...
- or
lightly callused. The
protoconch is smooth, dome-shaped, and large.
Collabral sculpture has large,
widely spaced folds, 9 to 11 per whorl.
Spiral sculpture...
-
numerous than the
axial ribs. The
sutural ramp is
sculptured by fine
collabral threads sinuous in
conformity with the anal sinus. The
spiral sculpture...
- ribs on its
penultimate whorl and 21 to 24 ribs on its last whorl. The
collabral threads are strong. On the base of the body
whorl one can see 7 to 9 spiral...
-
shape of the s**** is conical. It has a
peripheral carina and sharp,
collabral axial riblets.
There is no microsculpture. All
whorls possess midwhorl...
-
callus wash or weak
parietal callus deposits in some species, but
lacking collabral parietal callus ridge.
Columella multiplicate, with
combined total 2 to...
-
riblets on its
penultimate whorl and 21 to 24 ribs on its last whorl. The
collabral threads are weak. On the base of the body
whorl one can see 12 to 13 spiral...
