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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...
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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...
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somewhat strongly involute and
greatly compressed s**** with a sharp,
oxyconic, venter.
Beatites was
first found in
Albania and is ****igned to the ceratatiid...
- Jur****ic,
included in the Strigoceratidae, Haploceratoidea. The s**** is
oxyconic, with a
sharp rim but no keel, and involute, with the
inner whorls hidden...
- 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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specimen was used as type for
description of
invalid genus Praehaploceras.
Oxyconic forms of this
subfamily (Polyplectus and Sphenarpites) does not have any...
- 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...
-
develop prominent tubercles,
although other types including those with
oxyconic s**** are included.
Families included in the
Acanthoceratoidea are: Acanthoceratidae...
