- saddles.
Three major types of
suture patterns are
found in the Ammonoidea:
Goniatitic –
numerous undivided lobes and saddles. This
pattern is characteristic...
- "
goniatitic" to this
particular suture pattern. In some the
sutures have a
distinctive "zigzag" pattern. Not all
goniatitid ammonoides have
goniatitic...
- subglobose,
generally evolute and smooth, with a
rounded venter, and
simple goniatitic sutures.
Treatise on
Invertebrate Paleontology, Part L, Ammonoidea; Geological...
-
smooth saddles and
serrate or
digitized lobes. In a few the
sutures are
goniatitic while in
others they are ammonitic.
Ceratitida Ceratitoidea Choristoceratoidea...
-
discoidal s**** with no
prominent sculpture,
moderately large umbilicus, and
goniatitic or
ceratitic sutures with a
trifid (three pronged)
ventral lobe and few...
-
necks point to the rear)
reflective of
their nautiloid ancestors and
goniatitic sutures with a
variable number of lobes. S**** vary from
discoidal to...
- discoidal, with a
rounded lower edge, a
moderate to
large umbilicus, and
goniatitic to
ceratitic sutures.
Suture complexity varies from 10 up to 22 total...
- in some
derived forms the
suture becomes simplified, ceratitic, even
goniatitic. The
Ammonitina are
derived from the Phylloceratina,
another ammonitid...
-
ornamented or
tuberculate s**** with
ceratitic sutures that may
become goniatitic or
ammonitic in some offshoots. (Arkell et al. 1962) The Ceratitoidea...
-
about 254
million years ago. The s**** is
thinly lenticular,
sutures are
goniatitic and have only
eight fully distinct lobes. Two
species are recognized....
