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Paractinoceras is a
genus of long, straight, and
slender actinocerid nautiloid with
siphuncular segments in the
early stages like
those of Actinoceras...
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Leurothoceras and
Paractinoceras, both from the
Upper Ordovician, are
shown to have
their source in
Middle Ordovician actinoceratids.
Paractinoceras is probably...
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probably derived from Actinoceras.
Related contemporary genera include Paractinoceras and
Troostoceras Curt Teichert, 1964. Actinoceratoidea.
Treatise on...
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Selkirkoceras in the
Burnam Limestone in
central Texas; with Actinoceras,
Paractinoceras, and
Kochoceras in the
Lander Sandstone in Wyoming, and with Armenoceras...
- †Odontopleura †Olenellus †Olenoides †Orthoceras †Oulodus †Ozarkodina †Pagetia †
Paractinoceras †Paterina †Pemphigaspis †Pentremites †Phillipsia †Phragmolites †Phylloporina...
- †Paquettoceras †Paracenoceras †Paracleistoceras †Paraconradoceras †
Paractinoceras †Paracyclostomiceras †Paracymatoceras †Paradakeoceras †Paradiscoceras...
- Actinoceratidae,
Seamann 1853, ?late E, M Ord - E Sil. Actinoceras, Kochoceras,
Paractinoceras, Saffordoceras,
Troostoceras Lambeoceratidae; Lambeoceras, Huroniidae...
- †Paleocrinus
striatus – or
unidentified comparable form †Paleyoldia †
Paractinoceras †
Paractinoceras lamellosum †Parallelostroma †Parallelostroma kaugatomi**** †Parallelostroma...
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Actinoceras is
thought to have
given rise to such
genera as
Kochoceras and
Paractinoceras in the
Actinoceratidae and to
Lambeoceras of the Lambeoceratidae. The...
- †Neospirifer
bakeri Nucula –
tentative report †Olenoides †Ozarkodina †Paladin †
Paractinoceras †Peripetoceras †Plaesiomys †Platyceras †Platystrophia †Posidonia †Prodentalium...
