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A new species of penaeid, Metapenaeus motohi sp. nov. is described based on material from the Philippines. This new species is most closely similar to M. ensis (De Haan, 1844) from Japan in the morphology of the thelycum, but differs in that the rostral teeth mostly number 8-9, the P2, P3, and P5 are elongate, and the distal portion of the petasma forms a narrow lobule with a small genital pore. [ABSTRACT FROM AUTHOR]

The penaeid shrimp, Metapenaeopsis sibogae (De Man, 1907) was previously known only from deep waters in Indonesia and the Philippines. In the present study, the occurrence of this species was reported for the first time from Japanese waters, based on twenty-one specimens collected from Kagoshima Bay, southern Japan, between 130 and 148 m depth. As a result of morphological examination, the ratio of rostrum length to carapace length was found a useful character to distinguish M. sibogae from the sympatric species, M. lata Kubo, 1949, and subspecies, M. provocatoria owstoni Shinomiya & Sakai, 2000. The body colouration of live specimens of M. sibogae is also described. [ABSTRACT FROM AUTHOR]