Clathrine Pédonculée

Overview

Clathrina lacunosa is a small calcareous sponge characterized by a distinct, rounded body supported by a thin, conspicuous stalk. Its name, which translates to "having holes," refers to the perforated appearance of its structure, which is composed of a network of intertwined, translucent tubes.

Appearance

This sponge typically appears as a soft, white or off-white ball measuring approximately 1 to 5 cm in diameter. The main body consists of a complex mesh of anastomosing tubes and features a single, terminal osculum (exhalent opening) at the top. It is attached to the substrate by a slender stalk that can reach several centimeters in length.

Distribution & habitat

Clathrina lacunosa is found in the North-East Atlantic, including the British Isles, the English Channel, and parts of the Mediterranean. It typically inhabits sheltered environments such as rocky overhangs, caves, and crevices, often attaching to stable surfaces like vertical rock faces or, occasionally, other organisms such as gorgonians. While it is primarily a shallow-water species, it has been recorded at varying depths.

Biology & behavior

As a microphagous filter feeder, this sponge draws water through its body via small pores (ostia). Specialized cells called choanocytes create a water current, allowing the sponge to capture tiny particles, such as bacteria and protozoa, for nutrition. The species is viviparous, with fertilization occurring internally within the maternal tissue, where the larvae develop before being released through the osculum.