Gold-dotted Flatworm

Thysanozoon nigropapillosum is a species of polyclad flatworms belonging to the family Pseudocerotidae. Some common names include gold-speckled flatworm, marine flatworm, yellow papillae flatworm, yellow-spotted flatworm, and yellow-spotted polyclad flatworm.

Description

Thysanozoon nigropapillosum has a long body and broad shape. They grow up to 3 in (76 mm). The dorsal surface is deep black and covered with numerous yellow-tipped papillae varying in size. The ventral surface is dark brown. The outer margin of the body is slightly wavy and bordered in opaque white. They have small, ear-like pseudotentacles in the middle of the anterior end. They swim by propelling themselves through the water with a rhythmic undulating motion of the body.

Distribution

This species is widespread in the Indo-Pacific.

Habitat

Thysanozoon nigropapillosum is quite common along the external reef.