Synalpheus antillensis Coutière, 1909

Material examined: Maranhão — Turiaçu: 1 M, Almirante Saldanha Expedition, St. 1751, 06.xi.1967, 00°37.0′S 44°40.0′W, 44.0 m depth, MOUFPE 8795 ; Pernambuco — Goiana: 1 M, 1 OV, Praia de Pontas de Pedra, 07°37′00′′S 34°48′51′′W, 1.0 m depth, in the sponge Haliclona implexiformis Hechtel, 1965, MOUFPE 21600 ; Sergipe —2 M, Plataforma Pcm11 Pós. Face Externa Pé: Fora Superfície Externa, MOUFPE 15791 ; Bahia —1 M, Nordeste Expedition III, St. 181, MOUFPE 13050 .

Description: Coutière (1909), as Synalpheus minus antillensis, and Anker et al. (2012).

Distribution: Gulf of Mexico (off Texas), Caribbean Sea (from Yucatan Peninsula to Venezuela), and Brazil (Abrolhos, Rocas Atoll, Trindade Island, Maranhão and from Ceará to São Paulo) (Anker et al. 2012, 2016; Soledade et al. 2015; this study).

Ecology: In coral reefs, coral rubble, coralline algae, and sponges (e.g., Ircinia sp.); mostly in heterosexual pairs; intertidal to 42 m (Anker et al. 2012, 2016). The material from Goiana, Pernambuco (MOUFPE 21600), was found in heterosexual pairs inhabiting coral rubble and sponges ( H. implexiformis).

Remarks: This species is recorded in association with the sponge H. implexiformis for the first time.