Prostheceraeus nigricornus Schmarda, 1859
Prostheceraeus nigricornus Schmarda, 1859: 31, pl. 6 fig. 71 (type locality: Paita, Peru).
Distribution
Paita, Peru.
Habitat
Benthic.
Remarks
Schmarda (1859) made a partial description of the species. It is characterized by an oval-oblong body with a reddish-yellow dorsal region, with numerous spots, conspicuous nuchal pseudotentacles, cerebral eyes arranged in a circle, and tentacular eyes distributed over the pseudotentacles. The reproductive system is located in the central region of the body, featuring a long and conspicuous penis papilla.