Description:
Leptosynapta tenuis is a diminutive species that reaches approximately 6 inches in length and 0.2 inches in diameter.  The body wall is thin and translucent white, allowing the internal organs to show through, especially the 5 longitudinal muscles that extend the length of the body.  There are no tube feet.  Rather, a series of anchor ossicles are used for attachment.  These pivot from anchor plates embedded in the body wall, and their sharp edges are used to snag objects in contact with the body.  Between the anchor plates are tiny papillae that lend the skin its texture.  Twelve tentacles, each with 9 - 11 digits, surround the mouth.   

Habitat:
Leptosynapta tenuis prefers sandy and muddy sediments in depths less than 3 feet, and sometimes is found in association with seagrasses. 

Range:  
This species was originally reported to range from Massachusetts through South Carolina.  However, it has been documented in Florida from the Indian River Lagoon and Biscayne Bay on the east coast, and from Levy and Franklin Counties on the West coast.