A new genus and species of axiid shrimp (Crustacea, Decapoda) from a southwestern Indian Ocean seamount

• Main Author: Peter C. Dworschak
• Format: Article
• Language: English
• Published: Consortium of European Natural History Museums 2016-09-01
• Series: European Journal of Taxonomy
• Subjects: Montanaxius mediumquod gen. et sp. nov.; Axiidae; seamount; sponge associate
• Online Access: http://www.europeanjournaloftaxonomy.eu/index.php/ejt/article/view/353

A new genus and species of axiid shrimp, Montanaxius mediumquod gen. et sp. nov., is described and illustrated based on three specimens collected from hexactinellid sponges from a seamount in the southwest Indian Ocean. The new genus is characterized by a laterally denticulate rostrum, short lateral carina, absence of submedian carina, a prominent toothed median carina, round pleomere pleura 2–5, pleurobranchs on second to fourth pereopods, and the presence of a male first pleopod and appendix interna on pleopods 3–5. It most closely resembles Levantocaris Galil & Clark, 1993 and Planaxius Komai & Tachikawa, 2008, but differs from the former by being gonochoristic, having a strongly elevated gastric region and well-developed eyes, and from the latter by its toothed median carina and the presence of a median telson spine.