Astreptoceras

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Astreptoceras is an extinct upper Cretaceous ammonoid cephalopod named by Henderson in 1970.^[1] Fossils belonging to this genera have been found in Antarctica and New Zealand.

The only described species is Astreptoceras zelandicum (Marshall, 1926).^[1] It is a small heteromorph ammonite with almost circular cross-section of the shell. Shell has probably only one straight shaft that is initially without ribs and constrictions. At diameter of about 2 mm there appears first constrictions and at late growth stages, these can be preceded by a collar and shallow secondary constriction. Weak ribs occurs at late growth stages.^[2]

References

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↑ Henderson, R.A. 1970 Ammonoidea from the Mata Series (Santonian-Maastrichtian) of New Zealand. Special papers in palaeontology, 6: 81 p.

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Nomenclator Zoologicus [1]
Sepkoski's list of cephalopod genera [2]

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[2] Henderson, R.A. 1970 Ammonoidea from the Mata Series (Santonian-Maastrichtian) of New Zealand. Special papers in palaeontology, 6: 81 p.

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[2]

Astreptoceras

References

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