-
arcuate short raised lines beneath the suture, also
bearing slender oblique costellae (13 on the
penultimate whorl),
which are
crossed by
transverse lirae....
-
imperforate band. The wall is calcareous, perforate, with
pustules and
short costellae on the surface; the
primary aperture interiomarginal.
Abathomphalus is...
-
conical protoconch has 3.5
convex whorls, with the last 0.8
whorl featuring costellae. The
teleoconch has 7-8 whorls,
prominently shouldered, with a concave...
- The
surface is rugose,
covered with
meridionally arranged pustules and
costellae on one or both sides. The wall is calcareous,
hyaline radial in structure...
-
Orthotetidina tend to be
slightly concavoconvex, with an
ornamentation of
costellae (thin
ridges radiating from the back of the s**** to the rim). Most orthotetidines...
-
gradated suture. They are
ornamented with oblique,
dense regular radiating costellae, and two
spiral lirae on the
lower part. The body
whorl is ventricose...
