- In anatomy, an apex (adjectival form: apical) is part of the s**** of a mollusk. The apex is the
pointed tip (the
oldest part) of the s**** of a gastropod...
- thick,
often broad,
convex ventral callus deposit on the
inner lip and
adapical to the
aperture which may be
important for
gravitational stability. Some...
- lobe. The
siphuncle is
moderate in size and
located subdorsally in the
adapical dorsal flexture of the septum.
Based on the
feeding and
hunting behaviors...
-
include the
position of the protoconch, the
narrow adapical region, and the bluish-grey
color of the
adapical area.
These features distinguish it from Cymbium...
-
generally straight,
beginning with a
subcircular cross section in the
adapical portion but
becoming faintly depressed adorally (toward the front). Sutures...
-
Cyrtogomphocerae family. It
lacks the
septal foramina grasping bullettes at the
adapical end of the
connecting rings. Its s**** are
endogastric and
strongly compressed...
- denticles.
Columellar lip callous, well separated, with two
plicae on
adapical part, one on
abapical part,
otherwise smooth.
Sculpture consisting of eight...
-
contracted toward the aperture. The
siphuncle is ventral.
Bullettes at the
adapical ends of the
connecting rings are small.
Teichertoceras is
thought to have...
- the s****. The
siphuncle is
close to the
venter and
found only in the
adapical portion.
Siphuncle segments nummuloidal (beaded in appearance), septal...
- offset,
probably ventrally. The
aperture is
strongly oblique,
sloping adapically toward the
presumed venter.
Plagiostomoceras is
included in the Michelinoceratinae...
