2. Dysidea simplex n. sp. (Fig. 3) Ëèqljqḓợ

Type specimen. Holotype (NIBRIV0000879332), Korea: Deokchon-ri (Geomundo Island), Samsan-myeon, Yeosu-si, Jeollanam-do, 18 July 1977, intertidal zone, by S. J. Yoon, deposited in the NIBR.

Description. Thin encrusting small mass sponge, size up to 4.5 × 2 × 0.5 cm. Surface smooth with several mound and round conules. Oscules 1 - 2 mm in diameter open at the end of each mound. Color in life, dark brown. Texture soft and compressible.

Skeleton. Skeletal structure very simple, regular meshlike with scalaryspongia easy to separate from sponge body. Primary fibres forms very wide plate-like sand. Primary fibres, 60 - 100, 150 - 200 μm in diameter. Secondary fibres, 40 - 60 μm in diameter, rarely cored with spicules.

Etymology. The species name, simplex, is named after the shape of simple skeletal structure of this sponge.

Remarks. This new species is similar to Dysidea glavea Kim et al., 2020 with loosely arranged skeletal structure but fibres in the new species are not cored with large sands.