San Diego Dorid
ExploreInvertebrate
San Diego Dorid
diaulula sandiegensis
The San Diego Dorid is a fascinating marine gastropod mollusk, belonging to the group of shell-less marine snails known as nudibranchs. Widely distributed along the rocky Pacific coast of North America, this sea slug captivates beachgoers and tidepoolers with its elegant appearance and slow, deliberate movements. Unlike many colorful nudibranchs, it displays a sophisticated, understated palette of creams and browns, making it a master of camouflage among the sponges it inhabits. This species plays an important role in its local ecosystem, acting as a specialized predator of marine sponges. By consuming these organisms, the dorid not only controls sponge populations but also bioaccumulates toxic compounds from its prey, repurposing them for its own chemical defense system. Observing a San Diego Dorid in a tide pool provides a wonderful glimpse into the complex evolutionary adaptations of soft-bodied marine invertebrates.
Habitat: Found in rocky intertidal and subtidal zones, particularly on reefs, in tide pools, and under ledges where marine sponges are abundant.
Appearance
The San Diego Dorid features an oval, slightly flattened body, typically ranging from cream to pale yellow or light tan. Its mantle is covered in numerous tiny, sensory papillae that give it a velvety, carpet-like texture. The most distinguishing identifier is the pattern of dark brown to black rings or spots scattered across its back, resembling leopard spots. Near the anterior end, it has two sensory rhinophores resembling small horns, while the posterior end boasts a conspicuous, flower-like rosette of retractile gills. It can grow up to 10 centimeters in length.
KingdomAnimaliaPhylumMolluscaClassGastropodaOrderNudibranchiaFamilyDiscodorididaeGenusDiaulula
Category
InvertebrateRarity
Common
Danger
1/5 · Very low
Snaps
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Interesting facts
The dark ring patterns on each San Diego Dorid are entirely unique, acting much like a human fingerprint.
Their eggs are laid in beautiful, spiral ribbons that resemble white lace or ruffled carnation petals attached to rocks.
When threatened, they can emit a mildly acidic secretion that makes them taste terrible to potential predators.
Special abilities
Ability
Chemical Camouflage
It absorbs toxic secondary metabolites from the sponges it consumes, using these noxious chemicals to deter predatory fish and crabs.
Ability
Caryophyllidia Armor
Its skin is packed with microscopic, glass-like calcareous spicules called caryophyllidia, providing a rough physical barrier against predators.
Ability
Gill Retraction
It can instantly withdraw its fragile posterior gill plume into a protective pocket inside its body when it senses vibrations or physical contact.
Measurements & details
- Length
- 2-10 cm
- Weight
- 0.005-0.05 kg
- Lifespan
- 1-2 years
- Clutch Size
- 1000-15000
- Incubation
- 10-20 days
Diet & Feeding
This nudibranch is a highly specialized carnivore that feeds almost exclusively on various species of marine sponges by scraping them with its radula.
Primary Foods
- Purple Encrusting Sponge
- Breadcrumb Sponge
- Glove Sponge
Foraging Method
- Grazing
Ecological connections
hunts
Purple Encrusting Sponge
Haliclona permollis
Feeds extensively on this encrusting sponge, scraping its tissue with a specialized radula.
eaten by
Leather Star
Dermasterias imbricata
Serves as a prey item for this predatory sea star, which is one of the few organisms capable of tolerating the dorid's toxic defenses.
Traits
No trait badges are assigned for this object yet.
Also known as
No aliases listed yet.
Collections
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Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How to identify San Diego Dorid?
The easiest way to identify San Diego Dorid is to use the Snappit nature identifier app.
How long is San Diego Dorid?
2-10 cm
How much does San Diego Dorid weigh?
0.005-0.05 kg
How long does San Diego Dorid live?
1-2 years
What does San Diego Dorid eat?
This nudibranch is a highly specialized carnivore that feeds almost exclusively on various species of marine sponges by scraping them with its radula.
Where is San Diego Dorid usually found?
Found in rocky intertidal and subtidal zones, particularly on reefs, in tide pools, and under ledges where marine sponges are abundant.
How does San Diego Dorid hunt?
Grazing
How many eggs does San Diego Dorid lay?
1000-15000
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