A systematic study on two new species of mysids (Crustacea: Mysida: Mysidae) and two common mysid species in Sri Lanka

The material examined was collected from nine major estuarine bodies from South-west to North-west of Sri Lanka. Four species of mysids belong to three genera, Mesopodopsis Czerniavsky, Anisomysis Hansen and Siriella Dana, were identified: Mesopodopsis orientalis Tattersall, 1908 Mesopodopsis zelanica Nouvel, 1954 and another two new species referred to as Anisomysis srilankensis nov. and Siriella srilankensis nov. herein. The new A. srilankensis nov. is presently known from Kalpitiya lagoon, and the second species S. srilankensis nov. is presently known from Negombo, Chilaw, Puttalam, Kalpitiya, Mannar and Achchankulum lagoons. Siriella srilankensis nov. does not resemble with any one of the Siriellinae groups. The clear morphological differences were observed between the A. srilankensis nov. with two other Anisomysis species, Anisomysis (Anisomysis) mixta, Nakazawa, 1910 and Anisomysis (Anisomysis) australis Zimmer, 1918.