-
Kochoceras of the Actinoceratidae, but with re****bent
septal necks. The
first siphuncular segment is large, broad, and blunt. Selkirkoceras,
which is
known from...
- with a
subtriangular to
depressed cross-section in
which the
ventral (
siphuncular) side is
typically angular or more
acutely rounded than the
dorsal (antisiphuncular)...
-
fossil straight s****ed nautiloids,
cylindrical calcareous growths ("
siphuncular deposits")
around the
siphuncle can be seen
towards the apex of the s****...
- 0.CO;2. ISSN 0022-3360. Mutvei,
Harry (2016-04-02). "
Siphuncular structures in
Calciosiphonate nautiloid orders Actinocerida, Orthocerida...
-
Danaoceras has a
laterally compressed s****
curved such that the
ventral or
siphuncular side is
longitudinally concave, i.e. is endogastric. The siphuncle, which...
-
inner side of the
connecting rings in
actinocerids and the
internal siphuncular deposits that grow
forward and back from the
region of the
septal openings...
-
members contain features in the
early growth stages reminiscent of the
siphuncular bulbs found the
archaic Plectronoceratae of the Late Cambrian. but so...
- with
respect to genus.
Curvature tends to be
slight with the
ventral or
siphuncular side
slightly concave in
profile (the
endogastric condition), and the...
- Föreningen i
Stockholm Förhandlingar 134(2):115-132 H. Mutvei. 1997.
Siphuncular structure in
Ordovician endocerid cephalopods. Acta
Palaeontologica Polonica...
- rod-bearing
baltoceratid with
undulations on the
dorsal side of the
ventral siphuncular rod that
correspond to the
segments of the siphuncle.
Septal necks are...
