An illustrated key to the species of Grania and Randidrilus (Annelida : Clitellata : Enchytraeidae) of eastern North America, Bermuda, and the Caribbean area

The marine, clitellate genus Grania Southern, 1913 is a globally prevalent group of enchytraeids in intertidal and shallow subtidal habitats, showing high diversity in tropical and subtropical latitudes. Due to the rapidly ri sing numbers of known species of Grania, taxonomic revisions, and modificat ions in species ranges, a basic aid to species recognition is required for systematic, biodiversity, and ecological studies. A dichotomous key using a natomical characters distinguishes the nine species of Grania and two speci es of the co-occurring and structurally similar genus Randidrilus Coates & Erseus, 1985, with known distributions within eastern North America, the ne ighboring islands of Bermuda, and the Caribbean area. Based on examination of type and recent material, annotations on structural details of the male ducts and statocysts of each of the nine Grania species are provided.