Brain Ascidian

Sycozoa cerebriformis

Sycozoa cerebriformis is a distinctive sea squirt characterized by its folded colony of zooids arranged in double rows, giving it a brain-like appearance. This species can grow up to 15 cm in size and typically starts as a flattened fan before expanding and folding. It is often found on the sea floor, in caves, and crevices at depths ranging from 0 to 50 meters. Its distribution spans across the Indo-West Pacific, particularly in regions of Australia and Indonesia, including Queensland, New South Wales, Victoria, Tasmania, South Australia, and Western Australia. As a sessile organism, the brain ascidian primarily feeds by filter-feeding, capturing plankton and other small particles from the water. It is hermaphroditic, allowing for both cross- and self-fertilization during reproduction. The life cycle involves the development of eggs into lecithotrophic larvae, which eventually metamorphose into benthic adults. Diving encounters with Sycozoa cerebriformis can be intriguing as divers observe the unique, brain-like structures nestled among rocky substrates or within caves. The colonies may often be found in clusters, making them an interesting subject for underwater photography. Although the conservation status of this species has not been evaluated, it is recorded at multiple dive sites, indicating a presence in various marine environments.