Semonia bauliensis Soutullo, Cuadrado & Norena 2021

Semonia bauliensis Soutullo, Cuadrado & Noreña, 2021 Semonia bauliensis Soutullo et al., 2021: 369–370, fig. 4b–e (type locality: Carbón Beach, Las Baulas National Marine Park of Guanacaste, Costa Rica, 10°20′53.4″ N, 85°51′44.5″ W). Distribution Carbón Beach, Las Baulas National Marine Park of Guanacaste, Costa Rica. Habitat Benthic, low intertidal, below stones on sand. Remarks The genus Semonia currently comprises two described species: S. maculata Plehn, 1896 and S. bauliensis, S. maculata has an ivory background color, with honey brown coloration in the pharynx and reproductive system areas. Nuchal tentacles, tentacular eyes, and cerebral eyes are present. The genital atrium is common, and the male reproductive system consists of a seminal vesicle and a short, rod-shaped penis papilla, lacking a prostatic vesicle. The female reproductive system consists of an elongated, S-shaped vagina, gradually widening distally, without Lang’s vesicle.