Description:
The seaweed cucumber is often observed as an epiphyte on seagrasses and algae.  It reaches a maximum size of approximately 4 inches, but most grow only 2 - 3 inches.  Body color is variable, but coloration consists of bright reds and greens, mostly mottled with patches of white from miliary granules clumped beneath the skin.  The body wall is thin and somewhat transparent.  Adult specimens have 12 tentacles surrounding the mouth.  No tube feet are present.  Rather, ossicles protruding from the body wall pivot from anchor plates to snag objects in contact with the body. 

Habitat:
Seaweed cucumbers are found in various vegetated habitats including Thalassia and Halodule seagrass meadows, mangroves, coral reefs, and in association with marine plants such as Ulva, Halimeda, Batophora, and Penicillus. 

Similar Species:
Seaweed cucumbers resemble other synaptids such as Leptosynapta species and Epitomapta roseola, however, its dark red and green coloration, lacking in these other groups, helps distinguish it.

Range:  
Seaweed cucumbers range from Bermuda through Florida, the Florida Keys and Dry Tortugas, to Belize and Brazil.