Temporal range: Barremian–Aptian
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.
- 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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