-
genera (e.g. Paleoceras), the
septa are
uniformly spaced. S**** of
ellesmerocerids are
typically smooth and
compressed and vary in form. They may be breviconic...
-
penetrated by a
narrow tube
which may
contain diaphragms reminiscent of the
Ellesmerocerid ancestor.
Endoceras was
named by Hall in 1847.
Distribution is widespread...
-
Cyclostomiceratidae is an
extinct family of
Early Ordovician, (C****inian),
ellesmerocerid cephalopods characterized by short,
essentially straight s****, a fairly...
- Cameroceras,
shown feeding on the
tarphycerid Aphetoceras,
while a
quartet of
ellesmerocerid Cyclostomiceras swim by.
Scientific classification Domain: Eukaryota...
- cephalopods, and,
among nautiloid cephalopods, is
prevalent among the
ellesmerocerids, endocerids, actinocerids, orthoceratoids, and bactritids. Orthocones...
-
Endocerids evolved from the
earlier ellesmerocerids, most
likely from a
genus similar to Pachendoceras. This
ellesmerocerid gave rise to Proendoceras, the...
-
Clarkoceras is a
genus of
breviconic ellesmerocerid cephalopods, one of only two
genera known to have
crossed from the Late Cambrian, Trempealeauan, into...
- A
cyclostomiceratid ellesmerocerid Saloceras S.
chinianense Euloma filacovi Zone Late
Tremadocian An
eothinoceratid ellesmerocerid S.
murvielense Euloma...
-
Levisoceras is a
genus of
early Ordovician ellesmerocerid cephalopods.
Levisoceras is a
distinctive ellesmeroceratid that
combines rapid expansion a strong...
-
Protactinocerida and Yanhecerida. The
Plectronoceratidae gave rise to the
other ellesmerocerid families,
including the
Upper Cambrian exogastric Balkoceratidea, and...
