-
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...
-
geologic time periods.
Their fossil s****
usually take the form of
planispirals,
although some
helically spiraled and
nonspiraled forms (known as heteromorphs)...
-
conical tube, the
growth of
which is
coiled into an
overall helical or
planispiral shape, for
reasons of both
strength and compactness. The
number of whorls...
- used to
describe various kinds of
freshwater snails whose s**** are
planispiral,
meaning that the s**** is a flat coil. Such s****
resemble a coil of...
- sole
living cephalopods whose bony body
structure is
externalized as a
planispiral s****. The
animal can
withdraw completely into its s**** and
close the...
-
families the s**** are not
helical in
their coiling, but
instead are
planispiral, flat-coiled. In
these s****, the
spire does not have a
raised point...
-
limestones of the
Carboniferous period in Europe, the s**** of
which is
planispirally coiled and can be
mistaken for the s**** of a cephalopod.[citation needed]...
- high-spired the
resulting s**** becomes. This may
range from zero, a flat
planispiral s****, to
nearly the
diameter of the aperture.
Irregularities or "sculpturing"...
- View of the
spire side of the
planispiral s**** of the
freshwater snail Anisus septemgyratus. The body
whorl is the
outermost complete revolution of the...
- snails. The word is also
applied to the
depressed central area on the
planispiral coiled s**** of
Nautilus species and
fossil ammonites. (These are not...
