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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...
-
specific geological time periods. The s**** of
Ammonitina are
typically planospiral,
coiled in a
single plane and
symmetrical from side to side. They come...
-
diversity of post-Tri****ic ammonites.
Ceratitids overwhelmingly produced planospirally coiled discoidal s**** that may be
evolute with
inner whorls exposed...
- Norway, Sweden, Estonia, and China.
Lituites produced a s**** with a
planospirally coiled juvenile portion at the apex,
reflective of its
tarphycerid ancestry...
- the
suborder Ancyloceratina. S**** of this
diverse group do not coil
planospirally, as
typical for most ammonites, but
rather take on a
variety of unique...
- with
multichambered tests of
perforate hyaline calcite.
Tests may be
planospiral, low or high trochospiral, or serial.
Interiors may be
complex with secondary...
-
planospiral or
trochospiral but may be
uniserial to
multiserial and are of
secreted hyaline (gl****y) calcite.
Chambers are
flattened in
planospiral forms...
-
Foraminifera characterized by
tests that are
exclusively multichambered,
mostly planospiral or trochspiral, or
derived from either. The
aperture is
commonly at the...
-
Spirillinata consist typically of a
proloculus followed by an
undivided planospirally or
trochospirally wound tubular chamber such that the test is either...
-
Oncocerida in
which s**** are
exogastrically or
endogastrically breviconic,
planospiral, or torticonic;
often with a
constricted or
visored aperture; and a siphuncle...
