(Marcus & Marcus, 1967)
Tropical east Pacific
Shallow subtidal off Isla Luz, Bahia de Concepcion, Baja California, Mexico, February 1992. Photo: Jeff Goddard
Marcus & Marcus (1967) proposed a subspecies Berthellina engeli ilisima for an orange Berthellina from the Gulf of California. They considered the shape and shell sculpture to differ from that of typical specimens from the east Atlantic. I don't think anything has recently been published on this genus but I may be mistaken. See Lucas Cervera's message suggesting that Berthellina quadridens is the correct name for Caribbean specimens, and second message suggesting that east Pacific animals were B. ilisima
• Gosliner, T.M. & Bertsch, H. (1988). A review of the genus Berthella (Opisthobranchia: Notaspidea) from the Pacific Coast of North America. The Veliger, 31: 46-67.
• Marcus, Er. & Marcus, Ev (1967) American opisthobranch mollusks. Part 2, Opisthobranchs from the Gulf of California. Studies Tropical Oceanography, Miami 6(1-2): 141-256. (Figs 1-95)
Rudman, W.B., 2002 (September 26) Berthellina ilisima (Marcus & Marcus, 1967). [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/bertilis