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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...
- 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...
- compressed,
discoidal Ammontida that may be
keeled or unkeeled,
tending to be
oxyconic, with
usually falcoid or
falcate ribbing. The
aptychi are
paired and differ...
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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...
- 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...
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Oppeliidae are
compressed to
oxyconic,
sculptured Haploceratoidea,
either unkeeled, unicarinate, bicarinate, or tricarinate; with
sutures in
great variety...
