GASTROSACCINI MYSIDS FROM AUSTRALIA, WITH A DESCRIPTION OF A NEW SPECIES OF HAPLOSTYLUS AND A KEY TO SPECIES OF THE GENUS (CRUSTACEA MYSIDACEA)

WA Museum Records and Supplements | Updated 1 decade ago

Abstract: Seven species of gastrosaccini mysids, one species of Gastrosaccus and six species of Haplostylus, are reported from the coastal waters of Australia, based on specimens deposited in the Western Australian Museum, Perth. Among them, one Haplostylus species from Western Australia is considered new and described as H. tenuicaudus sp. nov. The new species resembles the Australian congeners, H. queenslandensis (Bacescu and Udrescu, 1(82), H. udrescui Greenwood et al., 1991, H. australiensis Wooldridge et al., 1992, and H. dispar Panampunnayil, 1997, but differs from all the related species by having the following characters: the telson is relatively more slender, length 3 times basal width, laterally armed with more than 10 spines, including the terminal spine, with the subterminal spine smaller than and placed close to the terminal spine; the exopod of the male third pleopod has the terminal segment consistently longer than the penultimate segment. A key to all known Haplostylus species is presented.