Apocrinoceratidae
Apocrinoceratidae constitutes a family of Middle Ordovician nautiloid cephalopods characterized by straight or slightly curved, transversely ribbed shells having siphuncles composed of expanded segments, short recurved septal necks, and thick connecting rings. Derivation is from the Protocycloceratidae, a family of ellesmerocerids, which differ in having straight or concave siphuncle segments, but are otherwise similar in form.
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Apocrinoceratidae
Apocrinoceratidae constitutes a family of Middle Ordovician nautiloid cephalopods characterized by straight or slightly curved, transversely ribbed shells having siphuncles composed of expanded segments, short recurved septal necks, and thick connecting rings. Derivation is from the Protocycloceratidae, a family of ellesmerocerids, which differ in having straight or concave siphuncle segments, but are otherwise similar in form.
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Apocrinoceratidae constitutes ...... he characteristic annulations.
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classis
Cephalopoda
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familia
Apocrinoceratidae
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familia authority
Flower, 1957
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fossil range
Middle Ordovician
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name
Apocrinoceratidae
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ordo
phylum
Mollusca
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regnum
Animalia
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subdivision
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Genera
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Apocrinoceratidae constitutes ...... are otherwise similar in form.
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label
Apocrinoceratidae
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name
Apocrinoceratidae
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