Rough-mantled Nudibranch Onchidoris bilamellata
Onchidoris bilamellata sea slug
Marine nudibranch Rough-mantled
Close-up of Rough-mantled Nudibranch
Onchidoris bilamellata nudibranch species
Small Rough-mantled Nudibranch on rock
Rough-mantled sea slug Onchidoris bilamellata
Rough-mantled Nudibranch Onchidoris bilamellata
Onchidoris bilamellata sea slug
Marine nudibranch Rough-mantled
Close-up of Rough-mantled Nudibranch
Onchidoris bilamellata nudibranch species
Small Rough-mantled Nudibranch on rock
Rough-mantled sea slug Onchidoris bilamellata

Rough-mantled Nudibranch (Onchidoris bilamellata)

from $100.00
Quantity:

Live Rough-Mantled Nudibranch (Onchidoris bilamellata)
This is a wet, live, science specimen.

The Rough-Mantled Nudibranch (Onchidoris bilamellata) is a small but fascinating marine gastropod, known for its textured body and mottled brown-and-white coloration. Found on the undersides of rocks in the lower intertidal zone, this nudibranch is often seen feeding on encrusting bryozoans and other sessile invertebrates. Its raised whitish bumps (tubercles) provide camouflage among barnacles and algae, making it a favorite study species for intertidal ecology and adaptation.

These nudibranchs are collected by hand from the cold coastal waters of Maine and are excellent for marine biology classrooms, aquaria, and behavioral observation studies focused on molluscan anatomy and feeding behavior.

Common Name: Rough-Mantled Nudibranch
Scientific Name: Onchidoris bilamellata
Locations: Undersides of large rocks in the lower intertidal zone
Seasonality: Available year-round
Colors: Brown and black with raised whitish bumps
Size: 1” – 2”
Collected: By hand — gently detached from rocks
Quantity: Sold by the each

Uses: Ideal for aquariums, classroom observation, marine invertebrate studies, and coastal ecology education.

Note: This is a live marine specimen. Natural variations in size, color, and appearance from photos should be expected. If you would like any specimen preserved, please send a request to info@gulfofme.com.

Live Rough-Mantled Nudibranch (Onchidoris bilamellata)
This is a wet, live, science specimen.

The Rough-Mantled Nudibranch (Onchidoris bilamellata) is a small but fascinating marine gastropod, known for its textured body and mottled brown-and-white coloration. Found on the undersides of rocks in the lower intertidal zone, this nudibranch is often seen feeding on encrusting bryozoans and other sessile invertebrates. Its raised whitish bumps (tubercles) provide camouflage among barnacles and algae, making it a favorite study species for intertidal ecology and adaptation.

These nudibranchs are collected by hand from the cold coastal waters of Maine and are excellent for marine biology classrooms, aquaria, and behavioral observation studies focused on molluscan anatomy and feeding behavior.

Common Name: Rough-Mantled Nudibranch
Scientific Name: Onchidoris bilamellata
Locations: Undersides of large rocks in the lower intertidal zone
Seasonality: Available year-round
Colors: Brown and black with raised whitish bumps
Size: 1” – 2”
Collected: By hand — gently detached from rocks
Quantity: Sold by the each

Uses: Ideal for aquariums, classroom observation, marine invertebrate studies, and coastal ecology education.

Note: This is a live marine specimen. Natural variations in size, color, and appearance from photos should be expected. If you would like any specimen preserved, please send a request to info@gulfofme.com.

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Nudibranch eggs laid on intertidal rocks!

Nudibranch eggs laid on intertidal rocks!

Tidepool Tim says,  "This is the easiest nudibranch to find.  They are big, obvious, and abundant. that said, a few years ago there must have been some die-off as we couldn't find one anywhere!  Most invertebrates are like this - they have good years and off years in terms of spawning, settlement, and recruitment. These animals have two "horns" like antenna at the front and at the back you will see a ring of feathery structures which are their gills.  They resemble garden slugs when you pick them off the rocks. Their eggs are kind of neat - see in the pics - they look like layers of lasagna noodles attached to rocks - usually with a great herd of nudibrancsh settled alongside. Very impressive when you see them!  Go sea slugs!”