Temporal range: Middle Ordovician
Leurorthoceras is a flattened actinoceratid ammonite with a siphuncle narrower than in Actinoceras, segments of which tend to become longer in the mature parts of the phragmocone, the chambered part of the shell. This fossil is known from the Middle Ordovician of North America, Europe, and Siberia.
- Curt Teichert, 1964. Actinoceratoidea, Treatise on Invertebrate Paleontology, Part K. Geological Society of America and University of Kansas Press.
|This article related to nautiloids is a stub. You can help Wikipedia by expanding it.|