- The
Ellesmerocerida is an
order of
primitive cephalopods belonging to the
subclass Nautiloidea with a
widespread distribution that
lived during the Late...
- Plectronocerida: the
ancestral cephalopods from the
Cambrian Period Order †
Ellesmerocerida (500 to 470 Ma)
Order †
Endocerida (485 to 430 Ma)
Order † Actinocerida...
- been
borne out. The
earliest true
cephalopod order to
emerge was the
Ellesmerocerida,
which were
quite small;
their s**** were
slightly curved, and the...
- †Plectronoceratoidea = †Plectronocerida, †Protactinocerida, †Yanhecerida, and †
Ellesmerocerida. †Endoceratoidea = †Endocerida †Orthoceratoidea = †Orthocerida, †Ascocerida...
-
paraphyletic Cambro-Ordovician
Ellesmerocerida. A few
older studies consider Plectronocerida to be
descended from
Ellesmerocerida (rather than ancestral), but...
-
originally defined in 2013,
Multiceratoidea included four
nautiloid orders:
Ellesmerocerida, Oncocerida, Discosorida, and Ascocerida. The
order Tarphycerida was...
- cephalopods. They were
similar to the more
diverse Plectronocerida and
Ellesmerocerida, with
short s****,
closely spaced septa, and
diaphragms (partitions)...
-
Aulacocerids Phragmoteuthids Early forms the
earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida,
Actinocerida Brevicones: Ascocerida...
-
middle Trempealeauan) to the
other three plectronoceratoid orders, the
Ellesmerocerida and
Protactinocerida and Yanhecerida. The
Plectronoceratidae gave rise...
-
Aulacocerids Phragmoteuthids Early forms the
earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida,
Actinocerida Brevicones: Ascocerida...
