Abstract
The present study focuses on shrimps belonging to the genus Lysmata Risso, 1816, collected from Madagascar during the Atimo Vatae expedition carried out in 2010. Lysmata malagasy sp. nov. is a new species belonging to the clade named “long accessory ramous” or “cosmopolitan” in previous phylogenetic studies. The new species can be distinguished from the only two other representatives of this group in the Indo-west Pacific, L. ternatensis De Man, 1902, and L. trisetacea (Heller, 1861), by the accessory ramus of the lateral antennular flagellum consisting of four elongated articles. Lysmata lipkei Okuno & Fiedler, 2010 is reported here from Madagascar with a remarkable extension of its known range after its original description from Japan. This species has also been reported from Singapore and, as alien species, from Brazil. Lastly, L. kuekenthali De Man, 1902 known from numerous localities in the Indo-West Pacific biogeographic area, is reported for the first time from Madagascar. Results of the present morphological and molecular analyses suggest that L. hochi Baeza & Anker, 2008 from the Caribbean Sea is a synonym of the Indo-West Pacific L. kuekenthali, and thus the latter species is alien in the western Atlantic.
Highlights
The caridean shrimp genus Lysmata Risso, 1816 is the largest genus with 47 species in the relatively small family Lysmatidae Dana, 1852 (Chace 1997; Wicksten 2000; De Grave & Fransen 2011; De Grave et al 2014)
A more comprehensive phylogenetic analysis conducted by Baeza (2010), revealed a fourth clade named the “morpho-variable clade” that includes L. hochi and L. vittata, together with two species belonging to genus Exhippolysmata Stebbing, 1915, i.e., E. ensirostris (Kemp, 1914), and E. oplophoroides (Holthuis, 1948)
The previously recognized “long accessory ramous” and “unguiform accessory ramous” clades are well (BI) or strongly (ML) supported by our analyses. The former clade forms a subclade consisting of L. cf. trisetacea (Heller, 1861), L. intermedia (Kingsley, 1878), L. nilita Dohrn & Holthuis, 1950, L. moorei (Rathbun, 1901), and L. galapagensis Schmitt, 1924 in both trees, with high support in the BI analysis
Summary
The caridean shrimp genus Lysmata Risso, 1816 is the largest genus with 47 species in the relatively small family Lysmatidae Dana, 1852 (Chace 1997; Wicksten 2000; De Grave & Fransen 2011; De Grave et al 2014). In the same year, Fiedler et al (2010) discriminated three groups based on the accessory ramus of the lateral antennular flagellum, establishing: 1) the “short accessory ramous” group (with the cleaner clade belonging to this group); 2) the “long accessory ramous” group, and 3) the “unguiform ramous” group. The latter group is similar to the “morpho-variable” clade defined by Baeza (2010) but excluding the genus Exhippolysmata
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
