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Acrimeroceras is an
oxyconic Devonian goniatite and one of
three genera included in the
subfamily Paratornoceratinae. The
others being Paratornoceras and...
-
Paratornoceratinae is a
subfamily of
oxyconic dimeroceratids included in the
order Goniatitida, a
group of
Paleozoic ammonoids,
which have
closer affinity...
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Amaltheus is an
oxyconic ammonite with a
fairly open umbilicus,
serrated keel, and
slightly sigmoidal ribs from the
Lower Jur****ic, many of
which are strigate...
-
somewhat strongly involute and
greatly compressed s**** with a sharp,
oxyconic, venter.
Beatites was
first found in
Albania and is ****igned to the ceratatiid...
- three.
These are Amaltheus, Amauroceras, and Pleuroceras.
Amaltheus is
oxyconic, keeled, strigated, and
ribbed on the
outer flanks.
Amauroceras is smooth...
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Alcidellus is an
oxyconic (sharp ventered)
haploceratacean ammonite from the
Middle Jur****ic.
Alcidellus was
named as a
genus buy Gerd
Westermann in 1958...
-
those with
stout evolute s**** to
those whose s**** are
sharply rimmed,
oxyconic. The keel,
which runs
along the
middle of the venter, is
typically hollow...
- to the Perisphinctidae. The s**** is
strongly embracing,
tending to be
oxyconic (sharp rimmed).
Sides are
gently curved,
converging on a
narrow to sharp...
- in this
group ranges from more or less
circular through rectangular to
oxyconic. Ribbing, if present, is weak.
Suture is
relatively simple,
without markedly...
-
Oppeliidae are
compressed to
oxyconic,
sculptured Haploceratoidea,
either unkeeled, unicarinate, bicarinate, or tricarinate; with
sutures in
great variety...
