-
scarring in
Knightoconus fossils.
Scars from the
closely related Hypseloconus have been used to
determine its orientation.
Knightoconus started life...
-
hypseloconids and then
genera such as
Knightoconus that
eventually gave rise to the cephalopods.
Knightoconus is a Late
Cambrian monoplacophoran thought...
-
Palaeacmaea Hall & Whitfield, 1872 † Parmop****lla Matthew, 1886 †
Knightoconus †
Knightoconus antarcticus Many Cambrian-Devonian
species have been described...
- and
separated the true
cephalopods from ****tive
ancestors such as
Knightoconus,
which lacked a siphuncle.
Neutral or
positive buoyancy (i.e. the ability...
- cephalopods: Plectronocerida: Plectronoceras, Monoplacophora-like form:
Knightoconus?
First appearance of long-lasting
lineages Goniatite and
ceratite ammonoids...
- cephalopods: Plectronocerida: Plectronoceras, Monoplacophora-like form:
Knightoconus?
First appearance of long-lasting
lineages Goniatite and
ceratite ammonoids...
- cephalopods: Plectronocerida: Plectronoceras, Monoplacophora-like form:
Knightoconus?
First appearance of long-lasting
lineages Goniatite and
ceratite ammonoids...
- cephalopods: Plectronocerida: Plectronoceras, Monoplacophora-like form:
Knightoconus?
First appearance of long-lasting
lineages Goniatite and
ceratite ammonoids...
- cephalopods: Plectronocerida: Plectronoceras, Monoplacophora-like form:
Knightoconus?
First appearance of long-lasting
lineages Goniatite and
ceratite ammonoids...
-
Lower Cambrian strata. It has a high,
septate s****
similar to that of
Knightoconus .
These genera were once
considered ancestral cephalopods, but are more...
