Purple Ascidian

Sigillina cyanea

The Purple Ascidian, a species of tunicate, is characterized by its small size, reaching a maximum length of 0.4 cm. This sessile organism can be identified by its distinctive purple coloration, which helps differentiate it from similar species in its habitat. It is typically found in the Indo-West Pacific region, particularly around Australia and Indonesia, inhabiting various marine environments at depths ranging from 0 to 150 meters. Most occurrences are recorded shallower than 40 meters, with a significant percentage found below 160 meters. As a hermaphroditic species, the Purple Ascidian is capable of both cross- and self-fertilization. Its life cycle begins with eggs that develop into lecithotrophic larvae, which then metamorphose into benthic adults. This reproductive strategy allows for a flexible approach to breeding in the diverse and competitive marine environments it occupies. Diving encounters with the Purple Ascidian can be intriguing, as divers may observe these small creatures attached to various substrates. Their presence often indicates a healthy ecosystem, and they contribute to the overall biodiversity of the reef. The conservation status of the Purple Ascidian has not been evaluated by the IUCN, leaving its long-term viability uncertain.