-
Ectenolites is a
genus of small, slender,
cylindrical Ellesmeroceratids that
resemble Ellesmeroceras but are
smaller and
proportionally narrower. Septa...
- Ordovician, Gasconadian. (Flower 1964,
Teichert 1988); the
other being Ectenolites.
Clarkoceras has a
rapidly expanding,
laterally compressed, relatively...
-
Ellesmerocerida crossed (barely) into the Ordovician, with two genera,
Ectenolites and Clarkoceras.
Ordovician ellesmerocerids in turn
likely gave rise...
- s****ed Ellesmeroceratids, the
other two
being Ectenolites and Eremoceras. It
differs from
Ectenolites, from
which it is
probably derived, in
being stouter...
- in
descending order of age. With the
exception of the s****y
genera Ectenolites and Eoclarkoceras, none of the 30+
Cambrian cephalopod genera are known...
- be
straight or
slightly endogastric.
Could be said to be an
annulate Ectenolites.
Walcottoceras has been
found in the
Lower Ordovician of
British Columbia...
-
along with the
other Late
Cambrian ellesmeroceratid genera,
except for
Ectenolites and Clarkoceras,
which persisted into the Ordovician. Late
Cambrian Tanycamerocers...
- Wan****ou,
except for
Clarkoceras and
Ectenolites,
which persist into the
Lower Ordovician.
Clarkoceras and
Ectenolites provide the
ancestry for the diverse...
-
predominantly to the Ellesmeroceratidae.
Among these were
Clarkoceras and
Ectenolites which continued from the Late Cambrian,
along with the
exclusively Ordovician...
- one of which, the Ellesmeroceratidae,
continued by
means of the
genera Ectenolites and
Clarkoceras into the
Gasconadian in the
Lower Ordovician. The other...
