Abstract
Myanmarorchestia Hou, gen. n. with two new species is described from terrestrial habitats in Myanmar. This new genus is characterised by 4-dentate lacinia on left mandible, simple gnathopod I in both sexes, weakly chelate gnathopod II in male, simplidactylate pereopods and complex and lobed gills. Myanmarorchestia peterjaegeri Hou, sp. n. closely resembles M. seabri Hou, sp. n. in gnathopod II merus and carpus protuberant on posterior margin; however, the former is distinguished from the latter by palp of maxilla I with two articles, coxal gills convoluted, and telson with nicks on surface. Additionally, DNA barcodes of the new species are obtained to confirm their distinctiveness.
Highlights
The amphipod family Talitridae Rafinesque, 1815 includes two groups, the Orchestia group and the Talitrus group (Lowry and Coleman 2012)
There are 47 genera in the Orchestia group (Lowry and Coleman 2012, Wildish and Lecroy 2014), of which four terrestrial genera have been recorded in the Indo-West Pacific margins
The new genus Myanmarorchestia with chelate second gnathopods in male displays intermediate shape between Orchestia and Talitrus groups. We assign it to Orchestia group, due to its sexually dimorphic gnathopod II
Summary
The amphipod family Talitridae Rafinesque, 1815 includes two groups, the Orchestia group and the Talitrus group (Lowry and Coleman 2012). The new genus Myanmarorchestia is similar to landhopper genera Arcitalitrus Hurley, 1975, Keratroides Hurley, 1975 and Mysticotalitrus Hurley, 1975 in sharing following characters: left mandible lacinia mobilis 4-dentate; maxilliped palp article II unlobed, article IV distinct and small; gnathopod I simple; pereopods III–VII simplidactylate; and uropod I peduncle with distinct distolateral spine, outer ramus marginally bare.
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