-
Plectronocerida is a
primitive order from
which subsequent cephalopod orders are
ultimately derived.
Plectronoceratids are
known from the
Upper Cambrian...
-
ability to float)
would have come later,
followed by
swimming in the
Plectronocerida and
eventually jet
propulsion in more
derived cephalopods. Possible...
- that are
phylogenetically related. They are: †Plectronoceratoidea = †
Plectronocerida, †Protactinocerida, †Yanhecerida, and †Ellesmerocerida. †Endoceratoidea...
-
Plectronoceratoidea contains several exclusively Cambrian cephalopod orders:
Plectronocerida, Protactinocerida, and Yanhecerida.
Under some
classification schemes...
- Phylum:
Mollusca class:
Cephalopoda Subclass:
Nautiloidea Order: †
Plectronocerida Family: †Plectronoceridae Genus: †Plectronoceras
Ulrich & Foerste,...
-
Earliest unambiguous cephalopods:
Plectronocerida: Plectronoceras, Monoplacophora-like form: Knightoconus?
First appearance of long-lasting
lineages Goniatite...
-
Earliest unambiguous cephalopods:
Plectronocerida: Plectronoceras, Monoplacophora-like form: Knightoconus?
First appearance of long-lasting
lineages Goniatite...
-
Earliest unambiguous cephalopods:
Plectronocerida: Plectronoceras, Monoplacophora-like form: Knightoconus?
First appearance of long-lasting
lineages Goniatite...
-
Earliest unambiguous cephalopods:
Plectronocerida: Plectronoceras, Monoplacophora-like form: Knightoconus?
First appearance of long-lasting
lineages Goniatite...
-
Earliest unambiguous cephalopods:
Plectronocerida: Plectronoceras, Monoplacophora-like form: Knightoconus?
First appearance of long-lasting
lineages Goniatite...
