-
Planispiral is a
condition in
which a
tubicolous s**** is
coiled in a
single horizontal plane and the
diameter increases away from the axis of coiling...
- Norway, Sweden, Estonia, and China.
Lituites produced a s**** with a
planospirally coiled juvenile portion at the apex,
reflective of its
tarphycerid ancestry...
-
diversity of post-Tri****ic ammonites.
Ceratitids overwhelmingly produced planospirally coiled discoidal s**** that may be
evolute with
inner whorls exposed...
-
specific geological time periods. The s**** of
Ammonitina are
typically planospiral,
coiled in a
single plane and
symmetrical from side to side. They come...
-
Foraminifera characterized by
tests that are
exclusively multichambered,
mostly planospiral or trochspiral, or
derived from either. The
aperture is
commonly at the...
- Bellerophontoidea,
common name "bellerophonts", is a
superfamily of
extinct planospirally-coiled
globose molluscs. This
superfamily is
generally included within...
-
Oncocerida in
which s**** are
exogastrically or
endogastrically breviconic,
planospiral, or torticonic;
often with a
constricted or
visored aperture; and a siphuncle...
-
planospiral or
trochospiral but may be
uniserial to
multiserial and are of
secreted hyaline (gl****y) calcite.
Chambers are
flattened in
planospiral forms...
-
consists of an
enrolled open tube,
coming after the proloculus,
wound planospirally or conically,
commonly composed of an
optically single crystal of calcite...
- with
multichambered tests of
perforate hyaline calcite.
Tests may be
planospiral, low or high trochospiral, or serial.
Interiors may be
complex with secondary...
