title: New species of the genus Elachisina (Gastropoda: Elachisinidae) from northeastern Brazil.
abstract: The family Elachisinidae Ponder, 1985 includes minute marine gastropods that live predominantly in the sublittoral zone (Ponder & Keyzer 1998; Rolán & Rubio 2001; Rolán & Gofas 2003). Most elachisinids have been included in the genus Elachisina Dall, 1918 based on their shell morphology (Warén 1996; Rolán & Rubio 2001; Rolán & Gofas 2003), consequently, very little is known about the habitat and ecological niche of the species (Ponder & Keyzer 1998; Rolán & Gofas 2003). Elachisina floridana (Rehder, 1943) is the only Atlantic congener collected alive, and is known to live beneath rocks and in rocky crevices in the intertidal zone to about 1 m depth in the Bahamas and Caribbean Sea (Ponder 1985; Ponder & Keyzer 1998; Rolán & Gofas 2003; Redfern 2013). Eastern Atlantic E. canarica (Nordsieck & García-Talavera, 1979) was also collected alive from the Canary Islands, but with no information on the habitat (Rolán & Gofas 2003). The islands of the northeastern Atlantic and West Africa are the regions with the greatest Elachisina richness known, totaling nine species (Rolán & Rubio 2001; Rolán & Gofas 2003). Only E. floridana has been recognized so far to be widely distributed throughout the Western Atlantic (Rolán & Gofas 2003; Rios 2009; Redfern 2013).
authors.affiliation: Museu de Zoologia, Universidade de São Paulo, São Paulo 04218-970, Brazil.; Email: carlomagenta@gmail.com.
authors.forename: Carlo M
authors.initials: CM
authors.lastname: Cunha
authors.affiliation: Departamento de Educação e Ciências Humanas, Centro Universitário Norte do Espírito Santo, Universidade Federal do Espírito Santo, São Mateus 29932-540, Espírito Santo, Brazil; Email: unknown.
authors.forename: Franklin N
authors.initials: FN
authors.lastname: Santos
authors.affiliation: Laboratório de Bentos Costeiro, Departamento de Biologia, Centro de Ciências Biológicas e da Saúde, Universidade Federal de Sergipe, São Cristóvão 49100-000, Sergipe, Brazil; Email: unknown.
authors.forename: Silvio F B
authors.initials: SF
authors.lastname: Lima
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D001938:Brazil; D017753:Ecosystem; D049851:Gastropoda / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D062312:Islands; D009929:Organ Size