Dysidea pyeongdaensis, 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

3. Dysidea pyeongdaensis n. sp. ( Figs. 4 , 5 )

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Type specimen. Holotype (NIBRIV0000895363), Korea: Pyeongdae-ri, Gujwa-eup, Jeju-si , Jejudo, 14 August 2019, intertidal zone (sandy beach), deposited in the NIBR.

Description. Thick encrusting sponge from under side of flat rock in sandy beach, size up to 9 × 7 × 2.5 cm. Surface smooth with several tube-like projections covered with short conules. Oscules, 1 - 4 mm in diameter, at the top of projections and open toward sandy bottom. Color in life pale green. Texture soft and compressible.

Skeleton: All fibres cored with sands and broken spicules, but near surface conules cored with more sands than spicules. All near surface fibres membrane arranged irregularly ( Fig. 4E ). Primary fibres, 100 - 160 μm in diameter, densely cored with sands and broken spicules. Secondary fibres, 50 - 80 μm in diameter, bridged or wide web type, like loose mesh, rarely cored with sands and spicules.

Etymology. The species name, pyeongdaensis , is named after type locality Pyeongdae-ri, Jejudo.

Remarks. This new species is similar to Dysidea hydra Kang et al., 2020 in numerous broken spicules cored in some section of primary fibres, but differs in shape of sponge surface. The new species has several tube-like low projections. Oscules open toward the sandy bottom.

Figures

Fig. 4. Dysidea pyeongdaensis n. sp. A, external morphology in situ; B, surface close up; C- E, skeletal structure; F, breidge type secondary fibres; G, H, primary fibres near conules cored with sands. Scale bars:A=3 cm, B =2 cm, C=200 μm, D-H = 100 μm.

Fig. 5. Dysidea pyeongdaensis n. sp. A, wide secondary fibres rarely cored with spicules; B, primary fibres mostly cored with broken spicules. Scale bars: A, B=50 μm.