Type specimen. Holotype (NIBRIV0000754024), Korea: Chupodo, Yecho-ri, Chuja-myeon, Jeju-si, Jeju-do, 22 Aug 2002, Lee BI, by SCUBA diving, depth 15 m, deposited in the NIBR.

Description. Massive sponge, size up to 10 × 9 × 6 cm, divided to several parts at the top of the sponge. Surface has loose sand patches, not crust. Some parts of sponge have no sand. Oscules, 1.5-2 mm in diameter, opened at top of sponge. Colour in life, surface dark gray, beige inside. Texture, hard and incompressible.

Skeleton: Primary fibres, 200-300 μm in diameter, cored with dense, small sand particles. Secondary fibres, 80-100 μm in diameter, almost clear but rarely cored with small amounts of sand (Fig. 10F). Filaments, 5 μm in diameter, with terminal knobs, 10 μm in diameter.

Etymology. This species is named after the type locality Chupodo, Jejudo Island.

Remark. This new species is easily distinguished by a very hard and incompressible sponge texture. Primary fibres cored with dense, small sand particles similar to species in the genus Psammocinia. Secondary fibres are very thick and rarely cored with sand. Numerous small sand particles spread over some parts of the secondary web as in species in the genus Psammocinia; however, this new species has massive primary fibres fascicles (Fig. 10D, G).