- The
Ascocerida are
comparatively small,
bizarre Orthoceratoids known only from
Ordovician and
Silurian sediments in
Europe and
North America, uniquely...
- †Ellesmerocerida. †Endoceratoidea = †Endocerida †Orthoceratoidea = †Orthocerida, †
Ascocerida, and †Pseudorthocerida (the
Orthoceratoidea of Kröger 2007) Nautilitoidea...
- 410.5 Ma to present)
Order †
Orthocerida (482.5 to 211.5 Ma)
Order †
Ascocerida (478 to 412 Ma)
Order †
Bactritida (418.1 to 260.5 Ma)
Subclass † Ammonoidea:...
-
Ellesmerocerida Orthocones: Endocerida, Orthocerida,
Actinocerida Brevicones:
Ascocerida,
Oncocerida Earliest coiled cephalopods:
Tarphycerida Spirulid?: Shimanskya...
-
disadvantageous in
catching fast-moving prey. Some nautiloids, such as the
Silurian Ascocerida,
dropped the
phragmocone upon maturity,
presumably to
increase speed and...
-
Ellesmerocerida Orthocones: Endocerida, Orthocerida,
Actinocerida Brevicones:
Ascocerida,
Oncocerida Earliest coiled cephalopods:
Tarphycerida Spirulid?: Shimanskya...
-
Ascoceratidae is a
family of
Ascocerida,
bizarre orthoceratoid cephalopods, with longiconic,
deciduous early growth stages which undergo period truncation...
-
Ellesmerocerida Orthocones: Endocerida, Orthocerida,
Actinocerida Brevicones:
Ascocerida,
Oncocerida Earliest coiled cephalopods:
Tarphycerida Spirulid?: Shimanskya...
- four
nautiloid orders: Ellesmerocerida, Oncocerida, Discosorida, and
Ascocerida. The
order Tarphycerida was
considered a
potential member of the subclass...
-
Ellesmerocerida Orthocones: Endocerida, Orthocerida,
Actinocerida Brevicones:
Ascocerida,
Oncocerida Earliest coiled cephalopods:
Tarphycerida Spirulid?: Shimanskya...
