Abstract
A new species of the mysid crustacean genus Gastrosaccus Norman, 1868 (Mysida, Mysidae, Gastrosaccinae) is reported from a sandy shore of Lombok Island, Indonesia. These specimens resemble G. sorrentoensis Wooldridge & McLachlan, 1986 and G. yuyu Bamber and Morton, 2012 by the possession of an articulated process on the fifth abdominal somite together with a fringe of spine-like filaments on the posterodorsal margin of the carapace. The Lombok population differs from the known congeners by having comparatively fewer numbers of carpopropod segments on the endopod of the third to eighth thoracic limbs and the conformation in the telson and in the male third pleopod. Hence, G. lombokiensis sp. n. is proposed herein as a third species of “G. sorrentoensis” species group.
Highlights
The mysid genus Gastrosaccus Norman, 1868 (Crustacea, Mysida) currently comprises 24 species (Mees and Meland 2013) and has been recorded in the coastal waters of the eastern Atlantic to the western Pacific, through the Indian Ocean
Two species are remarkable by having an articulated broad process on the fifth abdominal somite as well as a fringe of spine-like filaments on the posterodorsal margin of the carapace, i.e., Gastrosaccus sorrentoensis Wooldrige & McLachlan, 1986 recorded from Western Australia and G. yuyu Bamber & Morton, 2012 from Java Island, Indonesia
They are assigned in this paper to the “G. sorrentoensis” species group
Summary
A new species of Gastrosaccus Norman, 1868 (Mysida, Mysidae, Gastrosaccinae) from a sandy shore of Indonesia.
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