- An
aptychus is a type of
marine fossil. It is a hard
anatomical structure, a sort of
curved s****y plate, now
understood to be part of the body of an ammonite...
-
postulated to have been a jaw apparatus. The
plates are
collectively termed the
aptychus or
aptychi in the case of a pair of plates, and
anaptychus in the case...
-
ammonites (extinct s****ed cephalopods), a
calcareous structure known as the
aptychus (plural aptychi) existed. When
these were
first described they were thought...
-
lacks an
aptychus, a
biomineralized plate which is
proposed to act as an
operculum which closes the s**** to
protect the body. However,
aptychus-like plates...
-
Hectocotylus Tentacles Carpus Dactylus M****
Suckers and
hooks Buccal region Aptychus Beak Odontop****
Radula Spadix and
antispadix Occipital region Nuchal crest...
- s**** is
often the only
mineralised part of a
mollusc (however also see
Aptychus and operculum). The s**** are
usually preserved as
calcium carbonate –...
-
feebly keeled.
Sutures are
simple with
phylloid saddle endings in some. The
aptychus is single,
found in sutu in
Psiloceras Badouxia Guex and Taylor, 1976 Caloceras...
- or less
tabulate venter, with
lateral or
ventrolateral tubercles. The
aptychus is
double valved with a
concentrically ribbed surface. "Paleobiology Database...
- An
aptychus with the name
Trigonellites latus, from the
Kimmeridge Clay Formation...
- scaphopods. The word "sculpture" is also
applied to
surface features of the
aptychus of ammonites, and to the
outer surface of some
calcareous opercula of marine...
