A new species of hemibranchiate sphaeromatid isopod of the genus Paracilicaea from Pakistan with the study of developmental stages of the male

A new species, Paracilicaea keijii, of hemibranchiate sphaeromatid isopod is described and illustrated from the rocky intertidal zone of Karachi Coast, Pakistan. Four developmental stages of male are described in detail with the help of illustrations. The relationship of P. keijii sp. nov. with two closely allied species and genus Paracilicaea Stebbing, 1910 with Cymodoce Leach, 1814 are discussed. Attention has also been paid to sexual dimorphism of the species.