- The
Trocholitidae are
Tarphycerida with
whorls in
close contact as with the Tarphyceratidae, but in
which the siphuncle,
similar in structure, becomes...
-
being laterally fanged.
Trochoidal coiling brings to mind the
later Trocholitidae.
Aethoceras was
originally found in the
lower Ordovician of Western...
-
known mainly from the
Lower Ordovician (M-U Canad); gave rise to the
Trocholitidae and
provided the
sources for the more
advanced barrandeocerids Genera...
- Kingdom:
Animalia Phylum:
Mollusca class:
Cephalopoda Subclass:
Nautiloidea Order: †Tarphycerida Family: †
Trocholitidae Genus: †Litoceras Hyatt, 1884...
- the whorl.
Furnish and
Glenister (1964)
placed B****manoceras in the
Trocholitidae (Tarphycerida),
interpreting the
curvature to be
ventral side convex...
-
tarphyceratid group consisting of the Estonioceratidae, Tarphyceratidae,
Trocholitidae, and Ophidioceratidae; the
barradeoceratid group,
derived from Centrotarphyceras...
-
Plectoceras of the Barrandeocerina.
Plectolites are
included in the
Trocholitidae. The s**** is
strongly costate.
Costae (ribs)
slope back from the umbilical...
-
resembles some lituitids.
Ophioceras seem to have its
origin in the
Trocholitidae,
possibly in Graftonoceras.
Ophioceras has a narrow,
evolutely wound...
-
siphuncles do not
appear until later in the
Early Ordovician with the
Trocholitidae,
which if so
would make it (Eburoceras) exogastric.
Eburoceras is the...
-
Discoceras is an
extinct marine cephalopod mollusk, a
member of the
Trocholitidae in the Tarphycerida. It is
distinct from Discosorus, It is characterized...
