-
outer imperforate layer and an
inner alveolar layer.
Apatures are
interiomarginal or near the
septal base.
Includes the
subfamilies Cyclammininae, Alveolophragmiinae...
- The
umbilical side is
imperforate and smooth. The
aperture is an
interiomarginal arch,
outside the umbilicus,
extending nearly to the periphery. Alfred...
-
characterized by
chambers arranged in a low trochspiral; 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...
- are canaliculate, that is have micro-tubular cavities. Apertures, an
interiomarginal arch. The
Pseudogaudryinidae differs from the
Verneuilinidae in the...
-
pustules and
short costellae on the surface; the
primary aperture interiomarginal.
Abathomphalus is the sole
genus of the
subfamily Abathomphalinae,...
- periphery,
those on the
umbilical side
radial and incised. The
aperture is
interiomarginal,
midway between umbilicus and periphery, and may be
partially covered...
-
inner lining, and are
distinctly perforate. The
aperture is a low
interiomarginal arch near the
periphery on the
umbilical side, with
narrow bordering...
-
externally by the
imperforate surface layer of the wall. The
aperture is
interiomarginal in the
early triserial stage,
terminal and
rounded in the adult. The...
-
narrow elongate monocrystalline spines.
Apertures vary in
position from
interiomarginal to
equatorial and may be
relatively large.
Secondary apertures along...
