Pleurobranchus reticulatus Rang, 1832 is redescribed from specimens collected in São Tomé Island (Gulf of Guinea, W Africa). A detailed description of both the external and internal anatomy is given, in particular of the shell, jaws, radula and,for the first time, the reproductive system. This structure is herein described for the first time. Ontogenetic variation of the colour pattern is also presented. This species is compared with other eastern Atlantic species of this genus.
São Tomé Island