Dysidea reticulum, 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 : 38-40

1. Dysidea reticulum n. sp. ( Figs. 1 , 2 ) Ğ형qljqḓợ

Type specimen. Holotype (NIBRIV0000879331), Korea: Byeonchon, Seodo-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 5 × 3 × 0.5 cm. Surface with large and small sands in fibres. Mostly primary fibres cored with large sands and secondary fibres with wide sand plates. Surface conules not distinct. Oscules rare, 1.5 mm in diameter. Color in life, dark brown. Texture soft and compressible.

Skeleton: All fibres with irregular diameter. Measurement of diameter in primary fibres is somewhat difficult because of attachment with large sands. Some primary fibres, 150 - 350 μm in diameter. Secondary fibres, 30 - 80 μm in diameter.

Etymology. The species name, reticulum , is named after the shape of skeletal structure network.

Remarks. This new species is similar to Dysidea glavea Kim et al., 2020 in skeletal structure but differ in sponge shape. All fibres of new species are densely cored with numerous large and small sands. Surface of sponge covered with numerous cored and attached sands. Several parts of skeletal structure have plate-like shape with numerous spaced networks ( Fig. 1C ). This new species is much thinner than D. glavea ’s thick mound shape.

Figures

Fig. 1. Dysidea reticulum n. sp. A, external morphology; B, surface close up under the dissecting microscope; C, skeletal structure under the dissecting microscope; D, skeletal struc- ture; E, cored large sands; F-H, secondary fibres cored with small sands. Scale bars: A =1 cm, B=500 μm, C=2 mm, D= 200μm, E-H=100μm.

Fig. 2. Dysidea reticulum n. sp. A, secondary fibres cored with large sands; B, rarely cored bridge type secondary fibres. Scale bars: A, B=100 μm.