A new species of Cirolana Leach, 1818 (Isopoda, Cymothoidea, Cirolanidae), from Havelock Island, Andaman Sea, northern Indian Ocean.

Cirolana swaraj sp. nov. was collected from brackish-water Neil Lagoon on Havelock Island, South Andaman and is described and illustrated in detail. Cirolana swaraj sp. nov. can be distinguished by: frontal lamina 2.2 times as long as greatest width, lateral margins slightly widening to rounded anterior margin; pereonite 1 dorsal anterior mid-region with convex boss covered with fine ridges, pereonites 17 each with a single transverse impressed line, posterior margin with 18, 18, 17 and 12 tubercles on pereonites 47 dorsal posterior margins respectively; pleonites 45 each with prominent median tubercle, 4 and 2 tubercules on each side of pleonites 45; pleotelson dorsal surface with sub-median double row of 5 tubercules, posterior lateral margins straight, posterior margin narrowly rounded with 6 robust setae and plumose marginal setae extending anteriorly to mid-length; uropodal exopod lateral margin with eight robust setae and a continuous row of plumose marginal setae. A key to the marine and estuarine genera of Cirolanidae of the northern Indian Ocean is given.

Cassidinidea andamanensis sp. nov., a new species of intertidal Sphaeromatidae (Crustacea: Isopoda) from the Andaman Islands, northern Indian Ocean.

Cassidinidea andamanensis sp. nov. was collected from intertidal habitats on the coast of South Andaman, Andaman Islands, India and is described and illustrated in detail. Cassidinidea andamanensis sp. nov. the second definitive record of the genus from India, is characterized by: smooth body surface, prominently convex epistome anterior margin, pleotelson dorsal smooth surface and the posterior margin is subtruncate and weakly convex with small setae, the appendix masculina posterior margin is narrowly rounded.

A new species of Corallana Dana, 1852 (Crustacea: Isopoda: Corallanidae) from the Andaman Islands, northern Indian Ocean.

Corallana mishrai sp. nov. collected from dead mangrove roots at Kodiyaghat, South Andaman, Andaman Islands, India is described and illustrated in detail. Corallana mishrai sp. nov. the first definitive record of the genus from India, is characterized by: frontal lamina with short straight (or very weakly convex) lateral margins and the anterior margin forming a strong acute median point; pleotelson length 0.76 greatest width, posterior margin with 5 robust setae; uropodal exopod 7 times longer than greatest width, extending beyond endopod by one fourth of its length; endopod lateral margin slightly convex with 4 RS and PMS, apex forms a slightly obtuse angle with long simple setae, mesial margin weakly convex with 2 RS and PMS; mandible bidentate; transverse row of 6 tubercles present on pereonite 1 and pleonites 2, 3 and 4 lacking lateral tubercles. The status of the genus and its species are reviewed, and two species are transferred to new combinations: Argathona kulai (Bruce, 1982) comb. nov. and Tachaea bidentata (Jones et al. 1983) comb. nov.

A new species of Aphantolana Moore amp; Brusca, 2003 (Crustacea: Isopoda: Cirolanidae) from the Andaman Islands, northern Indian Ocean.

Aphantolana wandoor sp. nov. is described from intertidal algae in South Andaman, Andaman Islands. Aphantolana wandoor sp. nov. is characterized by the uropodal exopod posterolateral margin with a slight concavity, mesial margin evenly convex with 2 robust setae, pleotelson posterolateral lateral margin concave, weakly sinuate.