Dysidea membrana, Kim & Lee, 2023

Kim, Young A & Lee, Kyung Jin, 2023, Seven new species of genus Dysidea (Demospongiae: Dictyoceratida: Dysideidae) from Korea, Journal of Species Research 12 (1), pp. 38-47 : 41-44

6. Dysidea membrana n. sp. ( Figs. 9 , 10 )

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Type specimen. Holotype (NIBRIV0000895366), Korea: Deokchon-ri (Geomundo Island), Samsan-myeon , Yeosu-si , Jeollanam-do, 18 July 1977, intertidal zone, by S. J. Yoon, SCUBA diving, deposited in the NIBR.

Description. Thin encrusting mass sponge, size up to 9 × 2 × 1.5 cm. Surface, distinctly conulous, covered with thick membrane mixed with sands. Several oscules, 1 - 2 mm in diameter. Color in life, dark brown. Texture firm and compressible.

Skeleton. All fibres not easily separate from sponge body. Primary fibres and secondary fibres difficult to distinguish from each other. Some sections of fibres cored with large sands, 400 - 450 μm in diameter. Primary fibres, 200 - 300 μm in diameter. Secondary fibres, densely cored with sands, 60 - 80 - 100 μm in diameter and partly web type.

Etymology. The species name, membrana , is named after the thick membrane of sponge surface.

Remarks. This new species is similar to Dysidea sabulum Kang et al., 2020 in numerous large sands cored in primary fibres, but differs in sponge surface conules and secondary fibres. The new species has wide interval of thick conules and secondary fibres cored with dense sands more than D. sabulum .

Figures

Fig. 9. Dysidea membrana n. sp. A, external morphology; B, surface close up under the dis- secting microscope; C, D, skel- etal structure; E, F, secondary fibres with large sands; G, H, secondary fibres with middle sized sands. Scale bars: A =2 cm, B=5 mm, C-H =100 μm.

Fig. 10. Dysidea membrana n. sp.A, dense cored primary fibres; B, primary fibres near conules. Scale bars:A, B=100μm.