Ircinia, Nardo, 1833

Sim, Chung Ja, Lee, Kyung Jin & Kim, Hyung June, 2016, Nine new species of genus Ircinia (Demospongiae: Dictyoceratida: Irciniidae) from Korea, Journal of Species Research 5 (3), pp. 483-497 : 484

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

1. Primary fibres are cored with foreign debris ············ 2

- Primary fibres are slightly cored or uncored with foreign debris ································································ 8

2. Surface have thin filamentous membrane ················ 3

- Surface have thick filamentous membrane ·············· 7

3. Primary fibres at conules are cored with small and large sands ································································ 4

- Primary fibres at the base of sponge are cored with small and large sands ································ I. jejuensis

4. Primary fibres are cored with pebble-like large sands ······································································ I. lapillus

- Primary fibres are cored with small sands ··············· 5

5. All fibres have numerous perforation ······ I. gapaensis

- All fibres have rare perforation ································ 6

6. Root-like branched secondary fibres ······· I. grobulosa

- Fasciculate branched secondary fibres ········· I. bakusi

7. Thin incrusting sponge, choanosomal skeletal fibres are loosely arranged network ················· I. incrustans

- Round mass sponge, choanosomal skeletal fibres are thick and dense bundles ····················· I. munsumensis

8. Flabbily large round mass sponge, primary fibres are slightly cored ····································· I. mureungensis

- Thick encrusting sponge, primary fibres are uncored ································································ I. bergquistia

Figures

Fig. 1. Ircinia incrustans n. sp. A, entire animal; B, surface skeletal structure; C, closed surface skeletal structure; D, cored primary and secondary fibres; E, F, uncored primary and secondary fibres. Scale bars:A=2 cm, B=200 μm, C-F=100 μm.

Fig. 2. Ircinia grobulosa n. sp. A, entire animal; B, skeletal structure near surface; C, branched secondary fibres; D, cored primary fibres and secondary web; E, F, choanosome skeletal structure. Scale bars:A =2 cm, B=200 μm, C-F=100 μm.

Fig. 3. Ircinia gapaensis n. sp.A, entire animal; B, C, skeletal structure in conules; D­F, subdermal skeletal structure. Scale bars:A=2 cm, B, F=200 μm, C-E=100 μm.

Fig. 4. Ircinia gapaensis n. sp. A, B, choanosome skeletal structure; C, D, perforated fibres at the choanosome. Scale bars:A-D =100 μm.

Fig. 5. Ircinia lapillus n. sp. A, entire animal; B, C, skeletal structure in conules; D, cored primary and secondary web; E, choanosome skeletal structure; F, skeletal structure near surface; G, choanosome thick skeletal structure; H, choanosome skeletal structure. Scale bars:A =2 cm, B, C=200 μm, D-H=100 μm.

Fig. 6. Ircinia bakusi n. sp. A, entire animal; B, skeletal structure in conules; C, subdermal skeletal structure; D, closed skeletal structure; E, cored primary fibres near surface; F, choanosome skeletal structure; G, primary and secondary fibres; H, branched secondary fibres. Scale bars:A=3 cm, B, C=200 μm, D-H=100 μm.

Fig. 7. Ircinia munsumensis n. sp. A, entire animal; B, closed surface; C, skeletal structure near surface; D, secondary web between cored primary fibres; E, choanosome skeletal structure; F, choanosome thick secondary fibres. Scale bars: A=2 cm, B=10 cm, C=200 μm, D­F=100 μm.

Fig. 8. Ircinia munsumensis n. sp. A, choanosome skeletal structure; B, surface membrane with cored primary fibres; C, branched second­ ary fibres; D, secondary web. Scale bars:A-D=100 μm.

Fig. 9. Ircinia jejuensis n. sp. A, entire animal; B, closed surface; C, skeletal structure in conule; D, secondary web between primary fi­ bres cored with spicules; E, uncored primary fibres and secondary fibres; F, perforated secondary fibres. Scale bars: A=4 cm, B=12 cm, C=200μm, D-F=100 μm.

Fig. 10. Ircinia jejuensis n. sp. A, basal part of secondary fibre branch; B, skeletal structure of sponge basement; C, D, primary fibres cored with large and small sands at the base of sponge. Scale bars:A­D=100 μm.

Fig. 11. Ircinia mureungensis n. sp. A, entire animal; B, closed surface; C, skeletal structure near surface; D, closed primary fibres and secondary web; E, subdermal skeletal structure; F, secondary fibres between cored primary fibres; G, choanosome skeletal structure; H, branched secondary fibres. Scale bars:A=6 cm, B=10cm, C=200 μm, D-H=100 μm.

Fig. 12. Ircinia bergquistia n. sp. A, entire animal; B, closed surface; C, surface conules and membrane with spicules; D, E, skeletal structure near surface; F, branched secondary fibres; G, primary and secondary fibres; H, branched secondary fibres. Scale bars:A=2 cm, B=10 cm, C­H=100 μm.