Worm-like Sea Cucumber

Overview

The Worm-like Sea Cucumber (Leptosynapta inhaerens) is a slender, burrowing marine invertebrate that lacks the tube feet typically found in other sea cucumbers. It is commonly found living within sandy or muddy substrates, where it remains largely hidden from view.

Appearance

This species features a soft, pale pink, and often translucent body that can reach lengths of up to 30 cm. Its worm-like appearance is enhanced by the absence of external tube feet and the presence of visible longitudinal muscle bands running along its body. The mouth is surrounded by 12 pinnate tentacles, each equipped with 5–7 pairs of digits that increase in size toward the tip. Microscopic examination of its spicules—which consist of anchors paired with flat, pear-shaped plates—is often required to distinguish it from similar species.

Distribution & habitat

Leptosynapta inhaerens is distributed across the northeastern Atlantic, ranging from the southern coast of Brittany up to Norway, including the English Channel and the North Sea. It inhabits intertidal zones and shallow waters down to 50 meters, where it burrows into mud, sand, or gravel. It may also be found near the bases of seagrasses like Zostera or among flocculent algae.

Feeding

As a psammivorous organism, this sea cucumber feeds by processing sand and mud. It extracts organic matter and detritus from the sediment, playing a role in the turnover of benthic materials.