Ten new species of genus Sarcotragus (Demospongiae: Dictyoceratida: Irciniidae) from Korea Author Sim, Chung Ja Author Lee, Kyung Jin Author Kim, Hyung June text Journal of Species Research 2016 2016-10-31 5 3 443 458 http://dx.doi.org/10.12651/jsr.2016.5.3.443 journal article 10.12651/JSR.2016.5.3.443 2713-8615 13146859 6. Sarcotragus dentilus n. sp. ( Fig. 7 ) Type specimen. Holotype (NIBRIV0000325794), Korea : Fig. 7. Sarcotragus dentilus n. sp. A, entire animal; B, closed surface; C, surface filamentous membrane with pore; D, subsurface thin primary and secondary fibres; E, fasciculate secondary fibres; F, primary fibres fascicle; G, thin primary fibres; H, primary and branched secondary fibres. Scale bars: A =2 cm, B = 20 cm, C­H= 100 μm. Munseom , Seogwipo­si , Jeju­do , 10 Feb 2002 , Lee KJ , by SCUBA , Depth 25m , deposited in the NIBR . Description. Hemispherical mass, size up to 12 × 9 × 4 cm . Surface, sharp conules covered with thin perforated filamentous membrane. Fine fasciculate fibres appeared under membrane. Several oscules open on sponge surface, 1­5 mm in diameter. Colour pale gray and beige in life. Texture firm and compressible. Skeleton: Primary fibres loose fascicles, 400-1000 μm in diameter, with numerous perforations. Fasciculate or porous secondary fibres branched out. Bridge form of secondary fibres, 50-200 μm in diameter. Filaments, 3-5 μm in diameter, terminal knobs, 10-12 μm in diameter. Fibres difficult to separate from filaments. Etymology. This species name dentilus is named after teeth­like surface conules. Remark. This new species is characterized by perforating membrane with numerous opening. Loose fasciculate primary fibres have numerous perforation.