- were
straight (orthoconic),
others curved (cyrtoconic); some were long (
longiconic),
others short (breviconic). Some long-s****ed
forms like
Endoceras attained...
-
order of
nautiloid cephalopods from the
Ordovician comprising exogastric longiconic cyrtocones, that is no
longer in
common use. The
Order B****lerocerida...
-
included in the Geisonoceratidae. As with the orthocerids, its s**** is
longiconic,
siphuncle more or less central, and
chambers somewhat long. Note that...
-
Pseudorthocerida is an
order of
generally straight longiconic orthoceratoids with a
subcentral to
marginal cyrtochoanitic siphuncle composed of variably...
-
family Kionoceratidae.
Ohioceras is
characterized by a
slightly curved longiconic s**** with a
circular to
slightly depressed cross-section. The surface...
- 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...
- as a
family within the
Oncocerida to
include genera characterized by
longiconic orthocones and
cyrtocones with a
subtriangular to
depressed cross-section...
-
possibly Estonia that can be
recognized by its slender,
weakly endogastric,
longiconic and
annulate s**** and
large marginal siphuncle that
contains endocones...
- Niko, S.; Ehiro, M. (2024). "Two
Olenekian (Early Tri****ic)
species of
longiconic cephalopods from the
Osawa Formation,
Miyagi Prefecture,
Northeast ****an"...
