PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Cymatoceras honmai

Taxonomy

Cymatoceras honmai was named by Matsumoto and Miyauchi (1983). Its type specimen is MNH 144, a shell, and it is a 3D body fossil. Its type locality is Location 2, Kiyohama-I, Cape Soya, which is in a Campanian marine sandstone in Japan.

Sister species lacking formal opinion data

Year	Name and author
1983	Cymatoceras honmai Matsumoto and Miyauchi p. 225 figs. Pl 48, fig 2; pl 49, figs 1,2
2003	Cymatoceras honmai Wilmsen and Yazykova p. 487 fig. 7

part	N	mean	minimum	maximum	median	s.d.
shell height	2	31.6	30.0	33.3	31.6	2.33
shell diameter	2	51.2	50.5	52.0	51.2	1.06
shell inflation	2	5.29	5.00	5.60	5.30	0.424

Time interval	Ma	Country or state	Original ID and collection number
Early/Lower Campanian	83.6 - 72.2	Russian Federation	Cymatoceras honmai (172979)
Late/Upper Campanian	83.6 - 72.2	Japan	Cymatoceras honmai (type locality: 165935 165936)