Tytthosoceros lizardensis Newman & Cannon, 1996
This species has been found in Heron Island and Lizard Island Lagoon in the Great Barrier Reef, Australia.
External anatomy: Soft and delicate body, elongated and oval, slightly tapered posteriorly and raised medially. The dorsal background is mottled varying from chocolate brown to olive green with cream dots forming transverse streaks medially and laterally. A very narrow grey and black marginal band interrupted with short white transverse streaks of microdots at the edge. The ventral side is cream and light brown toward the margin, yellow submarginally and a black border. Small pseudotentacles ear-like shape with white tips and mottled with cream in between, with dense groups of pseudotentacular eyes. The cerebral cluster is horseshoe shaped and consists of about 60 to 100 eyes in a clear area. Long pharynx formed by about 5 pairs of simple folds. One male pore is posterior to pharynx and a female pore behind and close to the male pore. Small sucker separated from the gonopores and place around in the mid-body.
Internal anatomy: The male reproductive system consists of an oblong and muscular seminal vesicle, small and spherical prostatic vesicle, a small and wide penis stylet housed in a wide and shallow antrum. The female system has a deep antrum and wide cement pouches with a thick and muscular vagina surrounded by the cement glands.
This species has been found in Heron Island and Lizard Island Lagoon in the Great Barrier Reef, Australia.
This is a rare species found under coral rubble at the reef crest and reef slope and abundant under the rocks, inshore at Lizard Island Lagoon
The holotype is a whole mount of an entire specimen and the paratype is also a whole mount and a set of serial histological sections deposited at the Queensland Museum in Brisbane, Australia.