-
dichotomy between short-s****ed
forms with
complex endocones and long-s****ed
forms with
simple endocones.
Endocerid relationships have been
difficult to...
-
especially in the
young but
which may be
tubular in the
adult stage.
Endocones are simple,
subcircular in
cross section, and
penetrated by a
narrow tube...
- ("
endocones"),
concreted from the rim of the
siphuncle and
tapering towards the apex of the s****. Both
orders possess simple perforate endocones, with...
- with
simple endocones which lack the more
complex structures ****ociated with the
Proterocameroceratidae and
their derivatives.
Endocones,
nested cone-shaped...
-
concretions known as
endocones,
which have a
simple conical form in Cameroceras. A thin
endosiphuncular tube p****es
through the apex of each
endocone, in the lower...
- also
derived from the Proterocameroceratidae, the main
endocones are
flanked by two
smaller endocones, one on each side,
superficially resembling Allotrioceras...
- to Teichert, 1964, are holochoanitic,
reaching to the
previous septum.
Endocones are
described as
having a
dorsal wedge, or process,
making the internal...
-
distinctive trait is the
conical shape of the diaphragms,
similar to the
endocones which characterize the
later nautiloid order Endocerida.
While some authors...
- the
Ordovician with
Proendoceras or
similar genus which had
developed endocones,
replacing the
diaphragms of the
ellesmerocerid ancestor. Proterocameroceratids...
-
connecting rings, one
chamber in
length line the
inside of the necks.
Endocones are long and slender, fill the
entire bulbous, nanno-end, of the siphuncle...
