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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...
-
diversity of post-Tri****ic ammonites.
Ceratitids overwhelmingly produced planospirally coiled discoidal s**** that may be
evolute with
inner whorls exposed...
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specific geological time periods. The s**** of
Ammonitina are
typically planospiral;
coiled in a plane,
symmetrical side to side. S**** vary in form, including...
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planospiral or
trochospiral but may be
uniserial to
multiserial and are of
secreted hyaline (gl****y) calcite.
Chambers are
flattened in
planospiral forms...
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Foraminifera characterized by
tests that are
exclusively multichambered,
mostly planospiral or trochspiral, or
derived from either. The
aperture is
commonly at the...
- with
multichambered tests of
perforate hyaline calcite.
Tests may be
planospiral, low or high trochospiral, or serial.
Interiors may be
complex with secondary...
- Norway, Sweden, Estonia, and China.
Lituites produced a s**** with a
planospirally coiled juvenile portion at the apex,
reflective of its
tarphycerid ancestry...
- Bellerophontoidea,
common name "bellerophonts", is a
superfamily of
extinct planospirally-coiled
globose molluscs. This
superfamily is
generally included within...
-
produce typical planktotrophic veliger larvae with a smooth,
almost planospiral s**** at hatching.
There are
usually at
least 100 eggs/capsule, but the...
-
Lower Tri****ic. One of the
earliest ceratites,
Xenoceltites has a
narrow planospiral s**** with a
compressed whorl section, that has a
suture with two weakly...
