FIGURE 1. Alpheus christofferseni n in Three transisthmian snapping shrimps (Crustacea: Decapoda: Alpheidae: Alpheus) associated with innkeeper worms (Echiura: Thalassematidae) in Panama

FIGURE 1. Alpheus christofferseni n. sp., female paratypes from Atol das Rocas, Brazil (MNRJ 17926) (a–h) and male holotype (MNRJ 17905) (i): a, frontal region, dorsal view; b, same, lateral view; c, tooth on mesioventral carina of first antennular segment, lateral view; d, scaphocerite of antenna, dorsal view; e, third maxilliped, lateral view; f, telson and left uropod, dorsal view; g, distal margin of exopod of right uropod; h, orbital hoods and rostrum of another specimen, dorsal view; i, appendix masculina and appendix interna of male second pleopod. Scale bars: 1 mm.