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 10. Sarcotragus mamillus n. sp. ( Fig. 12 ) Type specimen. Holotype (NIBRIV0000554219), Korea : Mureungachi , Daejeong­eup , Seogwipo­si , Jeju­do , 15 Fig. 8. Sarcotragus purpureus n. sp. A, entire animal; B, surface skeletal structure; C, primary fibres fascicle; D, end of primary fibres fascicle; E, thin primary and secondary fibres; F, cylindrical primary fibres; G, thick primary fascicles at the base of sponge; H, choanosome skeletal structure. Scale bars: A = 4 cm, B =200 μm, C-H= 100 μm. Fig. 9. Sarcotragus mureungensis n. sp. A, entire animal; B, closed surface; C, primary fibres fascicle; D, branched secondary fibres; E, secondary fibres; F, secondary web. Scale bars: A = 2 cm, B =15 cm, C =200 μm, D-F= 100 μm. Aug 2015, Moon SE, by SCUBA , Depth 20 m , deposited in the NIBR . Description. Irregular mass, size up to 12 × 8 × 4 cm . Surface, slightly protruding like mamillate form, low conules with filamentous membrane. Oscules, 4­6 mm in diameter, open at protruding surface. Colour in life gray. Texture very soft and compressible. Choanosome lacunose, subdermal skeletal fibres well develope. Skeleton: Subdermal skeletal structure very thick, primary fibres, 400­800 μm in diameter, wide secondary web, 600­1400 μm in diameter, bridged secondary fibres, 100­400 μm in diameter. Skeletal structure of basal part, very thick, it’s big different from one near surface. All primary and secondary fibres have numerous irregular perforations. Filaments, 3­5 μm in diameter, terminal knobs, 10 μm in diameter. Etymology. This species is named after surface mamillate form. Remark. This new species is similar to Sarcotragus geomunensis n. sp. in collagenous secondary web, but differs in choanosomal primary fibres. Surface membrane of this new species has no perforation.