-
characterized by
chambers arranged in a low trochospiral; an
umbilical or
interiomarginal aperture, with or
without supplementary apertures; and a wall structure...
-
hyaline (gl****y) calcite, with
typically globular chambers and
single interiomarginal aperture. Some
however have
multiple or
auxiliary apertures, and in...
- overall. The
periphery angular to
carinate (keeled); the
aperture an
interiomarginal slit on the
umbilical side,
bordered by a lip.
Loeblich and Tappan...
-
pustules and
short costellae on the surface; the
primary aperture interiomarginal.
Abathomphalus is the sole
genus of the
subfamily Abathomphalinae,...
-
radial in structure,
surface smooth to
hispid or rugose;
aperture an
interiomarginal, extraumbilical-umbilical arch
commonly bordered above by a narrow...
-
narrow elongate monocrystalline spines.
Apertures vary in
position from
interiomarginal to
equatorial and may be
relatively large.
Secondary apertures along...
-
inner lining, and are
distinctly perforate. The
aperture is a low
interiomarginal arch near the
periphery on the
umbilical side, with
narrow bordering...
- periphery,
those on the
umbilical side
radial and incised. The
aperture is
interiomarginal,
midway between umbilicus and periphery, and may be
partially covered...
- The
umbilical side is
imperforate and smooth. The
aperture is an
interiomarginal arch,
outside the umbilicus,
extending nearly to the periphery. Alfred...
-
attached forms may
uncoil in the adult. In
coiled forms, the
aperture is
interiomarginal, or
terminal in
uncoiled forms. The test wall is made of optically...
