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Home/Ichthyopedia/Spotted Dorid
Spotted Dorid
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Activity
Observe
Rarity
Uncommon
Primary biome
Secondary biomes
Protection status
Complex
Sea slugs are not on the list of animals that may be taken from the rocky intertidal, so none may be taken from a tidepool or anywhere between the high tide mark and 1,000 feet seaward of the low tide mark (14 CCR 29.05). Farther out, the general limit of 35 for an unlisted invertebrate applies; north of Yankee Point in Monterey County, scuba divers may not take them at all. Take of all invertebrates is prohibited inside state marine reserves.
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Taxonomy

Phylum
Mollusca
Class
Gastropoda
Order
Nudibranchia
Family
Polyceridae
Genus / Species
Triopha maculata
Family, common name
Dorid nudibranchs

Rarity

Encounter rarity
Uncommon
Abundance
3 / 5
Find difficulty
3 / 5
Rating area and season
British Columbia to Baja California.
Conservation status
Not assessed by the IUCN Red List. No California fishery and no species-specific protection

Abundance rates how many are in suitable habitat. Find difficulty rates how hard it is to locate one on a daylight snorkel or freedive through 50 ft. A higher find score means a harder search. The rarity category also reflects the kind of encounter; it is not an average of the 2 scores.

Typical habitat
Rocky intertidal and shallow subtidal rock, on bryozoans.
Dive-depth context
Intertidal into the shallow subtidal.

Seasonality

Arrival
No fixed arrival established
Peak season
No distinct peak established
Departure
No fixed departure established
Active-season abundance
— pending research
Off-season period
No distinct off-season established
Off-season presence
Unknown; no evidence of seasonal absence.
Off-season abundance
Not established
Off-season rarity
Not established
Breeding season
Not documented in the sources read
Breeding-season aggression
None documented

Location

Range
British Columbia, Canada south to Baja California, Mexico
Habitat
Rocky intertidal and shallow subtidal rock, where its bryozoan prey grows
Biomes frequented
Tidepools biomeRocky Reef biome

Spotted dorids live on rock in the intertidal zone and in the shallow subtidal. They feed on bryozoans, small colonial animals that grow as crusts over rock, so they are found where those colonies grow.

Most are about 2 inches long, and a rare animal reaches about 7 inches. The color varies widely: the body runs from pale, see-through yellow through rich yellow, orange and red to dark brown. What stays constant is the spotting. The back is covered in raised white spots, and those spots are the field mark that gives the animal its name.

Deep Dive

A nudibranch that comes in so many colors is hard to learn from a single photo. The spotted dorid can be pale yellow on one rock and dark brown on the next. In adults, the raised white spots are the mark that holds across every color form.

Much about this animal is still unwritten here. The sources read for this page say nothing about its breeding or how long it lives, and nothing reliable about how young animals look. The young are described in 2 sources that could not be opened when this page was researched, and the 1 that could be read contradicts itself, so the juvenile colors are left out rather than guessed.

Where to Find Them

Researched habitat and range candidates

These locations have suitable habitat within the species range. An assignment is a possible encounter, not a confirmed sighting at every beach. Season, depth, and local conditions still matter. Historical habitat without present-day evidence is excluded.