Abstract
Two new species of Anisomysis Hansen, 1910 (Mysida, Mysidae), Anisomysis (Anisomysis) spinaintus sp. n. and Anisomysis (Anisomysis) phuketensis sp. n., from coral-reef waters in Thailand are described. Anisomysis (Anisomysis) spinaintus, collected in the Chaolao Beach, Chanthaburi Province, is distinguished from the closely allied species Anisomysis (Anisomysis) incisa Tattersall, 1936, and Anisomysis (Anisomysis) hawaiiensis Murano, 1995, by the presence of 6–9 spines on the apical cleft of telson, which are absent in the latter two allied species. The new species can also be distinguished from Anisomysis (Anisomysis) aikawai Ii, 1964, by the presence of a deep telson cleft and a large number of spines on the lateral margin of telson. Anisomysis (Anisomysis) phuketensis sp. n., collected in Ko Lon, Phuket, is distinguished from the allied species Anisomysis (Anisomysis) robustispina Panampunnayil, 1984, by having a short telson and a pair of long spines on the apical part of the telson. Keys to the subgenera and species of Anisomysis, including the two new species, are presented.
Highlights
The genus Anisomysis was established by Hansen (1910) to describe Anisomysis laticauda collected form Laiwui, Obi Island, Indonesia, during the Siboga Expedition.Băcescu (1973) divided the genus into two subgenera, Paranisomysis and Anisomysis, mainly on the basis of the structure of mandibular palp: the subgenus Paranisomysis has flagellate tubercles on the inner margin of the second segment of palp, while such tubercles are lacking in the subgenus Anisomysis
As the peculiar morphological characteristics were different from the existent characteristics of the genus Anisomysis, Murano and Fukuoka (2003) proposed to establish a new genus Javanisomysis
The genus Javanisomysis is cited as a valid name (i.e. Wittmann et al 2014), recently the genus is re-defined as a subgenus in the genus Anisomysis (Sawamoto, Srinui & Moriya, 2015) on the basis of examination of the paratypes of Javanisomysis gutzui
Summary
The genus Anisomysis was established by Hansen (1910) to describe Anisomysis laticauda collected form Laiwui, Obi Island, Indonesia, during the Siboga Expedition.Băcescu (1973) divided the genus into two subgenera, Paranisomysis and Anisomysis, mainly on the basis of the structure of mandibular palp: the subgenus Paranisomysis has flagellate tubercles on the inner margin of the second segment of palp, while such tubercles are lacking in the subgenus Anisomysis. Murano and Fukuoka (2003) carried out a systematic study of the genus Anisomysis and created the fourth subgenus, Pseudanisomysis, to accommodate a few species that have the eye divided into two parts by a groove based on A. bipartoculata. The present paper reports two new species of the subgenus Anisomysis, which were discovered during a study of the mysid diversity in Southeast Asia.
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