Tunic-Band Compound Tunicate

Euherdmania claviformis

Euherdmania claviformis is a social sea squirt characterized by its long, colorless, tube-like zooids that can grow up to 5 cm in height. These club-shaped tubes are often covered in clear sand, with a wider distal end compared to the base. Found along the California coast, this species thrives in the low intertidal to shallow subtidal zones, typically among the roots of surf grass in areas where the surf stirs up sand. The tunicate's environment is primarily rocky substrates in subtropical waters. As a sessile organism, Euherdmania claviformis does not actively feed during its larval stage. After fertilization, the eggs develop into microscopic, free-swimming tadpole larvae, which swim towards the surface before settling on rocks. The larvae attach quickly, retract their tails, and begin the transformation into sessile adults within 48 hours. They start feeding about a week after attachment, relying on filter-feeding to obtain nutrients from the surrounding water. Encounters with this tunicate during dives can reveal large aggregations, providing divers with a unique view of these colonial organisms. While the conservation status of Euherdmania claviformis is not evaluated, its specific habitat requirements make it susceptible to environmental changes.