On the genus Sabidius Strelzov, 1973 (Annelida: Paraonidae), with a redescription of the type species and the description of a new species

Abstract

Two species of Sabidius Strelzov, 1973 were collected during a benthic survey, from 10-3,000 m deep, in Espírito Santo Basin, off southeastern Brazilian coast. Those species are S. cornatus (Hartman, 1965) and S. antennatus sp. nov. The genus Sabidius was monotypic until the present study, in which a new species is proposed, together with a redescription of the type species, with expansion of the geographic distribution of the genus and of the type species. The diagnostic feature of the genus is the morphology of prostomium, with crested anterior margin. The main feature that differentiates the two species within the genus is the presence/absence of a median antenna, which is present in the new species described in the present study and absent in Sabidius cornatus.

Still Digging: Advances and Perspectives in the Study of the Diversity of Several Sedentarian Annelid Families

“…The prostomium is usually triangular, sub-trapezoidal, or rounded, but in some species of the genera Aricidea (e.g., Aricidea trilobata Imajima, 1973 [188]) and Sabidius (e.g., Sabidius cornatus (Hartman, 1965) [58]), it is more or less strongly trilobed. Sabidius species are peculiar in having a thickened cuticle on the anterior margin of the prostomium [189]. The presence or absence of a single antenna has been originally used to separate different genera [35], but it has been shown that all monophyletic lineages within Paraonidae include both species with and without antenna [14].…”

Three new species of Levinsenia Mesnil, 1897 (Annelida: Paraonidae) from shallow and deep waters of Southwestern Atlantic Ocean

“…Regarding the Brazilian coast, previous studies on paraonids registered the presence of six genera and 38 species, most of them from shallow waters [28]. Few systematic studies have been conducted on Brazilian paraonids [11,[29][30][31], so most (62%) of the previous records for the family in Brazil come from gray literature and papers with an ecological approach, in which specimens descriptions and illustrations are not given [28]. For this reason, most of these records are questionable.…”