-
ancestor of all cephalopods.
Plectronoceras is the type
genus of the
family Plectronoceratidae.
Fossils of
Plectronoceras have been
found in the San Saba...
- the
appearance of
gastropods (e.g., Aldanella),
cephalopods (e.g.,
Plectronoceras, Nectocaris?) and
bivalves (Pojetaia, Fordilla)
towards the
middle of...
-
gastropods (snails). The
similarity of the
early s****ed
cephalopod Plectronoceras to some
gastropods was used to
support this view. The
development of...
-
Earliest unambiguous cephalopods: Plectronocerida:
Plectronoceras, Monoplacophora-like form: Knightoconus?
First appearance of long-lasting
lineages Goniatite...
-
gastropods (snails). The
similarity of the
early s****ed
cephalopod Plectronoceras to some
gastropods was used in
support of this view. The development...
- of the Tarphycerida, the
first cephalopods to
evolve coiled s****
Plectronoceras was one of the
earliest known nautiloids,
existing in the late Cambrian...
-
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...
- Ellesmeroderida,
which have
their origin in the Plectronoceratidae,
either in
Plectronoceras or some
related genus.
Acaroceras is
known from the
lower and middle...
- Volbort****a's
classification is uncertain. The Late
Cambrian fossil Plectronoceras is now
thought to be the
earliest clearly cephalopod fossil, as its...
