Lissoceras

Lissoceras is an involute, smoothly or finely vetrolaterally ribbed ammonite with a blunt, un-keeled venter included in the Haploceratidae<nowiki/>family that lived from the Lower Bajocian to Middle Oxfordian (Middle to Upper Jurassic) ages in what is now Europe, south Asia, and southern Alaska.

Lissoceratoides, once considered to be a subgenus of Lissoceras, is indistinguishable morphologically from it.

References

• Arkell et al., 1957 Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geol Society of America and Univ Kansas Press R.C Moore (ed) 1957
• D.T Donavan, J.H. Callomon, and M.K Howarth. 1981. Classification of the Jurassic Ammonitina. In The Ammonoidea. M.R. House and J.R. Senior, eds. Systematics Assoc. Pub Academic Press.