Stolidobranch sea squirts gallery

Stolidobranchs group sea squirts (sessile tunicates) with undivided bodies. They have complex gills and their gonads are near the pharynx. In this group, there are solitary, social and compound ascidians. Tunicates are marine animals. Some live fixed, others swim in open water and some are solitary and others form colonies. Their body is surrounded by a more or less cartilaginous tunic (from the Latin tunica = tunic). Their tadpole larvae have a central axis or chord in the tail, an outline of the spine, axis which they generally lose in the adult stage.