Eubranchus sp. 1

Photo courtesy of Ali Hermosillo
Puerto Vallarta, Mexico

Eubranchus sp. 1 (Undescribed)

Another undescribed species to be found in the just released - Field Guide to the Sea Slugs of the Tropical Eastern Pacific – by our friends – Yolanda Camacho-Garcia, Terry Gosliner and Angel Valdes is this nifty new aeolid belonging to the genus, Eubranchus . Apparently Terry had collected this same critter in Papua New Guinea some years back and was surprised to find it on this side of the ocean. Since discovery in Costa Rica, Ali Hermosillo has collected it in Puerto Vallarta and Isabel Island, Mexico. This great little critter has green cerata with a subapical pink band. A dead give away are the 4 bands at the tip of each ceras, blue, orange, pink and white.

Camacho-Garcia et al. refer to the species aptly as “arcoiris”, Spanish for rainbow, drawing attention to the spectacular colors of the cerata. The egg mass of this species is a small transparent spiral.

This species is one of hundreds covered in this brand spanking new, full color guide includes every shallow water species known, from the southern border of Mexico to Ecuador and the Galapagos Archipelago. If you are interested in this region of the eastern Pacific this book is a must.

References: Camacho-Garcia, Gosliner and Valdes. 2005. Field Guide to the Sea Slugs of the Tropical Eastern Pacific. [Available from Sea Challengers ].

Dave Behrens
Gig Harbor, Washington
Sept. 2005

Puerto Vallarta, Mexico
March 2005

Ali Hermosillo and Dave Behrens

Author: Pacific Coast Nudibranchs
Co-Author Coral Reef Animals of the Indo Pacific
Proprietor of Sea Challengers Natural History Books

Send Dave mail at

© The Slug Site, Michael D. Miller 2005. All Rights Reserved.