-
relatively small median sinus in the
upper margin of the aperture, and
collabral (transverse) or
spiral (longitudinal)
threads covering the s****. The...
- 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...
- soft body in
these species. The
conical s**** has
peripheral carina and
collabral axial riblets. All
whorls contain midwhorl angulation but
spiral lirae...
- 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...
-
shape of the s**** is conical. It has a
peripheral carina and sharp,
collabral axial riblets.
There is no microsculpture. All
whorls possess midwhorl...
- 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...
- plus
parietal lirae,
plications usually excavated inside aperture due to
collabral parietal callus ridge.
Species within the
genus Crithe include: Crithe...
- shouldered,
rarely having subsutural angulation. The
sculpture of
strong collabral growth lines,
later whorls having numerous weak
spiral striae. The aperture...
-
varix absent;
siphonal notch absent;
posterior notch absent;
lacking collabral parietal callus ridge;
columella multiplicate, with
combined usually 2...
