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・ Heterobranchus
・ Heterobranchus bidorsalis
・ Heterobranchus boulengeri
・ Heterocallia
・ Heterocallia truncaria
・ Heterocampa
・ Heterocampa guttivitta
・ Heterocaprella krishnaensis
・ Heterocapsa circularisquama
・ Heterocarpon
・ Heterocarpus
・ Heterocarpus ensifer
・ Heterocentrotus
・ Heterocentrotus mamillatus
・ Heterocentrotus trigonarius
Heteroceras
・ Heterocercus
・ Heteroceridae
・ Heterocetus
・ Heterochaenia
・ Heterochaete
・ Heterocharax
・ Heterochasta
・ Heterocheila
・ Heterocheirodon
・ Heterochiton
・ Heterochlamydomonas
・ Heterochordariaceae
・ Heterochorista
・ Heterochorista acomata


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Heteroceras : ウィキペディア英語版
Heteroceras


''Heteroceras'' is a Lower Cretaceous heteromorph ammonite belonging to the ancyloceratacian family, Heteroceratidae, characterized by a helically coiled juvenile shell at the apex followed by slightly curved adult shaft, with a J-shaped section at the end of it. The shell is ribbed; ribs are concave and oblique on the helix, straight and transverse on the later stages.
''Heteroceras'' has been found in France, central Europe, the Caucasus, and Peru. Related genera are ''Hemibaculites'' and ''Cochidites''. The family, Heteroceratidae, is a derivative of the Ancyloceratidae.
==References==

* Arkell, ''et al'' 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America and Univ. Kansas Press.
* (Heteroceraras- Paleodb )
* ''For illustrations see'' (Genre Heteroceras, Orbigny 1850 )

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