Freckled Ancula

Ancula lentiginosa

Ancula lentiginosa is a sea slug characterized by its translucent white body, which is adorned with brown patches and stripes formed by small brown spots intermingled with white pigment. The pre-rhinophoral papillae, rhinophore clubs, and gills also exhibit a mottled brown appearance, while a line of brown spots can be seen along the ridge of the tail. This species can be recognized by its unique coloration and the presence of two extra-branchial papillae that are translucent white with a band of brown spots below their tips. This species originates from the Eastern Pacific, with its initial description made in La Jolla, California. It typically inhabits benthic environments where it feeds on Barentsia sp. and Entoprocta, which often grow on hydroids, bryozoa, and other living substrates. Ancula lentiginosa can reach a maximum length of 1.8 cm. Ancula lentiginosa is a simultaneous hermaphrodite, and its mating behavior involves two individuals attempting to penetrate each other's body wall to determine dominance. Eggs are laid on a suitable substrate, where they develop into a planktonic larval stage before maturing into adults. Encounters with this species during dives can be intriguing, as divers may observe its slow movements and distinctive patterns against the underwater backdrop. The IUCN has not evaluated the conservation status of Ancula lentiginosa, leaving its population status uncertain. However, it has been observed at multiple dive sites, indicating a notable presence in its habitat.