- is a
genus of
smooth s****ed,
discoidal ammonites with a depressed,
subtrigonal whorl section and
ceratitic sutures included in the
ceratitid family...
-
Tucetona bicolor is a
species of dog ****le. Its s**** is
subtrigonal with 39
radial ribs. The ribs have with
moderately shallow, very
narrow interspaces...
-
Moderately spiral.
Subtriangulate –
Moderately or
almost triangular.
Subtrigonal –
Moderately three-angled.
Subtruncate –
Moderately cut off. Subumbilicated...
-
ventral shoulders, and
flanks that
converge dorsally so as to
produce a
subtrigonal whorl section.
Nodes are
present on the
ventral shoulders.
Sutures have...
-
suspension feeder.
Rhynchonelloidella alemanica has
small sized s****,
subtrigonal to
slightly subpentagonal in outline, with wide
hinge line; inequivalve...
- (about 10) fine, more or less
beaded lira. The
aperture is
transverse subtrigonal. The
outer lip is
lirate within. The
basal margin is
slightly curved...
-
epifaunal suspension feeder.
Sharpirhynchia sharpi has a
small s****,
subtrigonal to
transverse or
laterally elongate in adults;
unequally biconvex, dorsal...
-
toward the aperture,
which in
adult specimens is
somewhat contracted and
subtrigonal. The
outer lip
shows a few
deeply entering lirae within, the
upper one...
- a 1.2 cm long filament,1.5 cm long
anther and a 2 cm long and oblong-
subtrigonal shaped ovary.
After the iris has flowered, it
produces an oblong-ovate...
