New species and new records of deep-water caridean shrimps from the South Atlantic Ocean (Crustacea, Decapoda)

One new species of deep water caridean shrimp is described from the Southwestern Atlantic, Heterocarpus inopinatus n. sp. (Pandalidae). The new species can be promptly distinguished from the other species of the genus with a short but distinct exopod on the third maxilliped as follows: 1) from Heterocarpus affinis by the absence of incision on the dorsal carina of the third abdominal segment (carina distinctly incised in H. affinis); 2) from Heterocarpus hostilis by the lateral carinae on the carapace well defined (no distinct lateral carinae in H. hostilis); 3) and from Heterocarpus dorsalis by the carapace with dorsal carina unarmed on posterior one third of length (posterior two third in H. dorsalis). Additionally, four new records are established as follows: Heterocarpus dorsalis Bate, 1888 (Pandalidae) from the Atlantic Ocean; Heterogenys microphthalma (Smith, 1885) (Oplophoridae) from the Southwestern Atlantic; Heterocarpus oryx A. Milne-Edwards, 1881 (Pandalidae) and Acanthephyra eximia Smith, 1884 (Oplophoridae) from southeastern Brazil.