- were
straight (orthoconic),
others curved (cyrtoconic); some were long (
longiconic),
others short (breviconic). Some long-s****ed
forms like
Endoceras attained...
-
Pseudorthocerida is an
order of
generally straight longiconic orthoceratoids with a
subcentral to
marginal cyrtochoanitic siphuncle composed of variably...
-
possibly Estonia that can be
recognized by its slender,
weakly endogastric,
longiconic and
annulate s**** and
large marginal siphuncle that
contains endocones...
-
Aipocerataceae in Kümmel 1964, the
Rutoceratina are
characterized as
having longiconic, curved, and
coiled s****
which develop solid, hollow, and spoutlike...
- rings, are
broadly expanded.
Pseudogomphoceras is a large,
atypically longiconic mandeloceratid that
reflects its
reudemannoceratid ancestry. The subcentral...
-
order of
nautiloid cephalopods from the
Ordovician comprising exogastric longiconic cyrtocones, that is no
longer in
common use. The
Order B****lerocerida...
- the Nautiloidea.
Hemichoanella is
characterized by its straight,
smooth longiconic s**** with a
circular cross section,
large marginal siphuncle and sutures...
-
Jovellaniidae found in mid
Silurian sediments in Europe. The s**** is a
longiconic cyrtocone, like that of
Jovellania or Mixosiphonoceras,
except for being...
- the Proterocameroceratidae,
characterized by a
rather large, straight,
longiconic s****,
short chambers,
generally straight sutures, and
large ventral siphuncle...
-
Ascoceratidae is a
family of Ascocerida,
bizarre orthoceratoid cephalopods, with
longiconic,
deciduous early growth stages which undergo period truncation and an...
