Doris odhneri

Odhner's Dorid

Family: Dorididae · Class: Gastropoda · Order: Nudibranchia

Odhner's dorid (Doris odhneri) is a species of sea slug, a dorid nudibranch, belonging to the shell-less marine gastropod mollusks in the family Dorididae. This species is notable for being one of the larger nudibranchs found along the Pacific coast (Grokipedia). The species exhibits the typical dorid body plan with a soft, oval-shaped body lacking an external shell, as is characteristic of all nudibranch sea slugs. Doris odhneri occurs along the Pacific coast of North America, with documented presence in California waters. The species has been recorded in various marine surveys, including NOAA fisheries bottom trawl surveys in the Gulf of Alaska, where it appears in species composition data as "white night doris" (NOAA Technical Memorandum AFSC-374, 2017). This distribution suggests the species ranges from Alaska southward to California waters, inhabiting both nearshore and offshore marine environments. The species occupies marine benthic habitats, typically found on rocky substrates, kelp forests, and other hard surfaces where it feeds on encrusting organisms. Like other dorid nudibranchs, Odhner's dorid likely prefers areas with adequate water circulation and prey availability. The species appears in bottom trawl survey data across various depth ranges, suggesting it can inhabit both shallow and deeper waters within its range. Doris odhneri exhibits typical nudibranch feeding behavior, using its radula (rasping tongue) to scrape food from surfaces. The species likely feeds on sponges, bryozoans, and other encrusting invertebrates common to its habitat. Reproductive behavior follows the hermaphroditic pattern typical of nudibranchs, where individuals function as both male and female. According to SeaLifeBase, the mating behavior involves both individuals darting their penis toward each other to induce one to act as male and the other as female, with the "victorious" individual assuming the male role during copulation. Like other nudibranchs, reproduction involves the laying of spiral egg masses on suitable substrates. The conservation status of Doris odhneri has not been formally assessed by major conservation organizations. iNaturalist reports no established conservation status for this taxon (iNaturalist, 2024). The species does not appear on federal or California state listing databases, suggesting it is not currently considered threatened or endangered. However, like many marine invertebrates, the species may face threats from ocean acidification, warming sea temperatures, and habitat degradation affecting rocky intertidal and subtidal communities. The lack of comprehensive population data makes it difficult to assess long-term trends or conservation needs. Scientific documentation for this species remains limited compared to more studied marine taxa. The information presented here is based on available sources including taxonomic databases, fisheries survey records, and online species databases. Research gaps exist regarding specific habitat requirements, population dynamics, and ecological relationships within its marine communities.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.