Ed Janss’ Dorid,  Limacia jansii

Ed Janss’ Dorid, Limacia jansii. Underwater photographs taken in Zihuantanejo Bay, Guerrero, January 2025. Photographs courtesy of Ron Woheau, Zihuantanejo.

Phylogeny:  Ed Janss’ Dorid, Limacia jansii (Bertsch & Ferreira, 1974), is a member of the Polyceridae Family Nudibranchs, the Orangetipped Sea Slugs. They are known in Mexico as Dórido de Ed Janss. The Limacia Genus is one of twenty-six genera in the Polyceridae Family, and there are thirteen species in the Limacia Genus. It was named in honor of the underwater photographer and explorer Ed Janss, Jr. 

Morphology: Ed Janss’ Dorid are soft-bodied gastropods that lose their shells during their larval phase. They have a thick mantle on their back (dorsal surface).  Their gills consist of feathery plumes that encircle the anus. They have rhinophores (horn-like projections) on their heads. Rhinophores are chemosensory organs help them to locate food and potential mates. They lack complex eyes, but have photoreceptors that sense light and dark. Ed Janss’ Dorid have a white and yellow colored body that is covered with numerous small orange spots. They have numerous club-shaped papillae surrounding the dorsum. Their gills and rhinophores are a red-orange. Ed Janss’ Dorids reach a maximum of 1.3 cm (0.5 inches) in length.

Habitat and Distribution:  Ed Janss’ Dorid are found on, and under, rocks at depths up to 9  m (30 feet). They  are a tropical Eastern Pacific species that is found in all Mexican waters of the Pacific Ocean with the exception that they are absent from north of Magdalena Bay along the central and northwest coasts of the Baja Peninsula and from north of Bahía de los Ángeles, Baja California.

Diet: Ed Janss’ Dorid prey on encrusting bryozoans.

Predators:  Ed Janss’ Dorid is poorly stuided and their preditors have not been formally documented.

Reproduction:  Ed Janss’ Dorid are simultaneous hermaphrodites (having both male and female reproductive organs). Reproduction is sexual, with internal fertilization. Mating is accomplished by two individuals aligning themselves so that they lock onto each other with their gonopores (structure on their right side that is usually retracted). Both individuals become inseminated. The eggs are laid as a string-like mass. The eggs hatch into veliger larva and later metamorphose into adults.

Ecosystem interactions:Ed Janss’ Dorid are a poorly studied and understood species. Their commensal, parasitic, and symbiotic relationships have not been documented.

Human Interactions:Ed Janss’ Dorid have no direct impact on human activities. From a conservation perspective they have not been formally evaluated however they are fairly common with a relatively wide distribution and should be consider to be of Least Concern.

Synonyms:   Laila janssi.