Clathrine Jaune

Overview

Clathrina clathrus, commonly known as the yellow clathrina, is a distinctive calcareous sponge characterized by its bright yellow, translucent appearance. It forms a dense, lattice-like network of interconnected tubes that can reach up to 10 cm in diameter.

Appearance

This sponge is composed of a tangled mass of anastomosing tubes, typically ranging from 0.5 to 3 mm in thickness. These tubes converge into larger channels that terminate in visible, prominent oscules (exhalant openings). Its structure is supported by a simple skeleton of microscopic, three-pointed calcareous spicules known as triactines. While typically bright yellow, the sponge can occasionally appear white.

Distribution & habitat

Primarily found in the Mediterranean Sea, this species also occurs in the northeastern Atlantic Ocean, ranging from the Canary Islands northward to the British Isles. It is a sessile, shade-loving organism that prefers calm, low-light environments. It is commonly observed attached to hard substrates in submarine caves, crevices, and beneath rocky overhangs.

Biology & behavior

As a filter-feeder, the yellow clathrina draws in water to extract bacteria, unicellular organisms, and other particulate organic matter. It is a hermaphroditic species that reproduces sexually, releasing larvae into the water column that eventually settle on suitable surfaces to develop. It may also reproduce asexually through processes like budding or fragmentation.