7. Dysidea chujaensis n. sp. (Fig. 11) Ṫḣqljqḓợ

Type specimen. Holotype (NIBRIV0000895367), Korea: Jeolmyeongyeo, Chujado, Chuja-myeon, Jeju-si, Jejudo, 1 July 2004, intertidal zone, by H. S. Kim, SCUBA diving, depth 25 m, deposited in the NIBR.

Description. Thick encrusting mass sponge, size up to 10 × 6 × 4.5 cm. Surface, rough with sharp large conules. Oscules not present. Fibres easily separate from sponge body. Color in life, beige. Texture soft and compressible. Skeleton: All fibres cored with very small sands and fibres with wide intervals (Fig. 11C) and arranged regularly. Primary fibres, 200 - 500 μm in diameter. Secondary fibres, 150 - 250 - 400 μm in diameter. All fibres have simple arrangement.

Etymology. The species name, chujaensis, is named after type locality Chujado, Jejudo.

Remarks. This new species is very similar to genus Pleraplysilla in the shape of sponge surface with thick spinelike conules, but differs in skeletal fibres. Fibres of the new species are not branched type. Simple skeleton is arranged regularly. All fibres are evenly cored with very small sands.