Sarcotragus, Schmidt, 1862

Sim, Chung Ja, Lee, Kyung Jin & Kim, Hyung June, 2016, Ten new species of genus Sarcotragus (Demospongiae: Dictyoceratida: Irciniidae) from Korea, Journal of Species Research 5 (3), pp. 443-458 : 443-444

Key to the species of Korean Sarcotragus (The key is illustrated by Figs. 1­12 )

1. Primary fibres are cylindrical fascicles ···················· 2

- Primary fibres are not cylindrical fascicles ················· ··················································· S. geomunensis n. sp.

2. Colour in life beige turns to dark brown ·················· 3

- Colour is not changed ·············································· 4

3. Ladder-like choanosome skeletal fibres ······················ ··························································· S. scalaris n. sp.

- Prismatic branched choanosome skeletal fibres ·········· ·························································· S. sucinum n. sp.

4. Cylindrical primary fibres are loose fascicles ·········· 5

- Cylindrical primary fibres are dense fascicles ········· 6

5. Surface conules with porous membrane are clearly distinct ·············································· S. dentilus n. sp.

- Surface conules with thick membrane are not distinct ······················································· S. purpureus n. sp.

6. Subdermal skeletal structure have very complex fibres ··················································································· 7

- Subdermal skeletal structure have simple fibres ······ 8

7. Secondary fibres are fasciculated branch ···················· ····················································· S. seogwiensis n. sp.

- Secondary fibres have large perforated pattern ··········· ························································· S. mamillus n. sp.

8. Subdermal branched secondary fibres are very rare ··· ·················································· S. mureungensis n. sp.

- Subdermal branched secondary fibres are numerous ··· ··················································································· 9

9. Primary fibres are large meshed cylindrical fascicles ···················································· S. chagwiensis n. sp.

- Primary fibres are braided longitudinal fascicles ········ ·························································· S. schmidti n. sp.

Figures

Fig. 1. Sarcotragus seogwiensis n. sp. A, entire animal; B, subdermal skeletal structure; C, fine skeletal structure under membrane; D, pri­ mary fibres fascicles; E, fasciculate branched secondary fibres; F, web of secondary fibres. Scale bars:A=2 cm, B=200 μm, C-F=100 μm.

Fig. 2. Sarcotragus geomunensis n. sp. A, entire animal; B, filamentous membrane; C, subdermal skeletal structure; D, secondary fibres web; E, primary and secondary fibres web; F, choanosome primary fibres. G-H, skeletal structure at the base of sponge. Scale bars: A=2 cm, B=100 μm, C=200 μm, D-H=100 μm.

Fig. 3. Sarcotragus schmidti n. sp. A, entire animal; B, surface skeletal structure; C, primary fibres; D, broad primary fibres fascicles; E, primary and secondary fibres; F, branched secondary fibres; G, narrow primary fibres with simple fascicles; H, branched secondary fibres. Scale bars:A=2 cm, B=200 μm, C-H=100μm.

Fig. 4. Sarcotragus chagwiensis n. sp. A, entire animal; B, closed surface; C, primary and secondary fibres; D, secondary web; E, skeletal structure; F, surface thin secondary fibres; G, primary fibres; H, secondary web. Scale bars:A=2 cm, B=7 cm, C­H=100 μm.

Fig. 5. Sarcotragus sucinum n. sp.A, entire animal; B, closed surface; C, surface skeletal structure; D, branched secondary fibres with mesh net; E, secondary web between primary fibres; F, choanosome prismatic skeletal structure. Scale bars:A=2 cm, B=10cm, C, F=200μm, D, E=100 μm.

Fig. 6. Sarcotragus sucinum n. sp. A, thick secondary fibres; B, primary fascicles with mesh net; C, choanosome skeletal structure; D, cho­ anosome secondary fibres; E, surface thick skeletal structure; F, thin secondary fibres. Scale bars: A-D, F=100μm, E=1 cm.

Fig. 7. Sarcotragus dentilus n. sp. A, entire animal; B, closed surface; C, surface filamentous membrane with pore; D, subsurface thin pri­ mary and secondary fibres; E, fasciculate secondary fibres; F, primary fibres fascicle; G, thin primary fibres; H, primary and branched sec­ ondary fibres. Scale bars:A =2 cm, B=20cm, C­H=100 μm.

Fig. 8. Sarcotragus purpureus n. sp. A, entire animal; B, surface skeletal structure; C, primary fibres fascicle; D, end of primary fibres fas­ cicle; 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, sec­ ondary fibres; F, secondary web. Scale bars: A=2 cm, B=15 cm, C=200 μm, D-F=100μm.

Fig. 10. Sarcotragus scalaris n. sp. A, entire animal; B, closed surface; C, filamentous membrane with pore; D, choanosomal skeletal struc­ ture; E, thick primary fibres; F, branched secondary fibres. Scale bars:A =2 cm, B=20cm, C, E, F=100 μm, D=200μm.

Fig. 11. Sarcotragus scalaris n. sp. A, primary fibres; B, secondary web between primary fibres; C, secondary fibres branch; D, small pri­ mary fibres; E, secondary fibres web; F, large skeletal structure at the base of sponge. Scale bars:A-E=100 μm, F=1 cm.

Fig. 12. Sarcotragus mamillus n. sp.A, entire animal; B, subdermal skeletal structure; C, secondary web; D, branched secondary fibres; E, F, skeletal structure at the base of sponge. Scale bars:A =2 cm, B=200 μm, C-F=100 μm.