Siriella australiensis Panampunnayil, 1995

Type locality. Southwest coast of Australia (Panampunnayil 1995) .

Record from Thailand. Khlong Don Sak, Surat Thani Province (Murano & Fukuoka 2008).

Habitat and depth range. Murano & Fukuoka (2008) did not provide the habitat and depth of the collected specimens. The occurrence of this species has been recorded from 1 up to 50 meter in depth (see Panampunnayil 1995; Biju et al. 2006).

Distribution. Siriella australiensis is known from Australia (Panampunnayil 1995), Minicoy lagoon, India (Biju et al. 2006), Philippines and Thailand (Murano & Fukuoka 2008).

Remarks. Hansen (1910) divided 15 Asian species of the genus Siriella into 4 groups. Later, Ii (1964) expanded the grouping of the Siriella mysids into six groups, Thompsoni -group, Inornata -group, Dubia -group, Pacifica - group, Aiquiremis -group and Anomala -group. However, after further revision, Ii’s (1964) grouping was expanded with 3 new groups to include previous non-categorized species. These were the Australiensis -group, Brevicaudata - group, and Singularis -group (Murano & Fukuoka 2008).

Species Siriella australiensis and S. scissilis are placed within the Australiensis-group due to the anterior margin of carapace more or less produced into triangular rostral plate; labrum with long frontal process. Endopod of middle pairs of thoracic limbs a little longer than those of anterior and posterior pairs; pseudobranchial rami of second to fourth male pleopods spirally coiled; exopod of third male pleopod and both rami of fourth male pleopod with or without remarkably modified setae; proximal segment of uropodal exopod armed with only spines on outer margin; inner margin of uropodal endopod armed with spines showing alternate arrangement of longer and shorter ones; telson long, more than 2.5 times as long as broad at base (Murano & Fukuoka 2008).