Sea Hares and Nudibranchs

Watch Sea Hares and Nudibranchs on
Nudibranch eating a Tube Anemone in Monterey Bay
American Bursatella Frilled Sea Hare . Asian Bursatella Frilled Sea hare
Frilled Nudibranch . Nudibranch sex life at Byron Bay . Aeolid nudibranch of Puget Sound

The opisthobranchs are sea hares and sea slugs, soft-bodied, snail-like mollusks that either have a vestigal shell or no shell at all. Their taxonomy is difficult, their position in the phylum Mollusca is hardly agreed upon by experts, but they are so beautiful and interesting that a seashore naturalist finds them hard to resist.


The most active, graceful, and best surviving of all the species of Aplysia. Aplysia is commonly studied by researchers for its easily accessible giant ganglia. Releases a purple ink when disturbed. Most unfortunately however, the mollusks are highly sporadic, appearing in huge numbers some years and completely unavailable in other years. Researchers are advised to place long term standing orders to insure a supply. Size: 6-10 cm.

Each: $32.00

Frilled sea hare (Bursatella leachiplei)

M-990 FRILLED SEA HARE, Bursatella leachiplei

A large, highly frilled, shelless snail, gray green with white specks. Surface covered with numerous ragged projections. When disturbed ejects a cloud of purple ink. Actively slides along the aquarium wall feeding on algae and often lays long strings of greenish eggs. Has exceptionally large radular teeth in crop, good for dissection. Sporadically available, mostly in winter. Size: 8-12 cm.

Each: $32.00


A lettuce sea slug (Tridachia chrispata)

M-995 LETTUCE SEA SLUG, Tridachia crispata

Commonly found in warm, tropical waters, it has green and white ruffles resembling lettuce! Feeds on real sea lettuce and other algae. It is a sacoglossan which means that they are herbivores, and do not feed on sponges or hydroids. Size: 4-6 cm.

Each: $40.00



A warty nudibranch (Dendro wartii)

M-1025 WARTY NUDIBRANCH, Dendro wartii

An interesting species of nudibranch. Green coloration with bumpy wart like surface. Availability is somewhat sporadic. Size: 4-8cm

Each: $40.00



A regal goddess nudibranch (Felimare picta)

M-1010 REGAL GODDESS, Femilare picta

A beautiful dark blue nudibranch with striking yellow circles. Sporadically available; may be substituted by other large and colorful nudibranches. Size: 4-8 cm.

Each: $40.00



M-1012 TIGER NUDIBRANCH, Armina tigrina

Each: $40.00






Nudibranchs are shelless mollusks. Aeolids are well known for their ability to feed on hydroid polyps, absorb the nematocysts without harm, and utilize them in their own defense. Shipments include species that feed on hydroid polyps. Florida Regal Goddess, Lettuce Nudibranch and Dorid nudibranch not included in assortments and must be order separately.

Per collection: $63.50


Aeolids feed on Aiptasia pallida anemone are helpful for home aquarists. Nudibranchs are shelless mollusks. Aeolids are well known for their ability to feed on hydroid polyps, absorb the nematocysts without harm, and utilize them in their own defense. Aeolid Nudibranchs are a suborder of Nudibranchia, the largest order in the subclass Opistobranchia (Ellis 2001). Nudibranch (pronounced Nudi-brank), means naked gills. Those organisms in the subclass Opistobrachia are hermaphroditic and have the atrium of the heart posterior to the ventricle (McDonald 1999). The order Nudibranchia is characterized by lack of shell, mantle cavity, operculum, and ctenidial gills in the adult form (McDonald 1999). There are four suborders of Nudibranchia: Doridoidea, Aeolidoidea, Dendronotoidea, and Arminoidea (Ellis 2001). Aeolids take their name from the Greek god of the winds, Aeolus because of the waving of their cerata resembles streamers in the wind (Tackett and Tackett 2003).

Each: $11.50


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