Leuctridae Klapálek, 1905

Murányi, Dávid & Hwang, Jeong Mi, 2017, Four new species and further contributions to the Leuctridae (Plecoptera) of the Korean Peninsula, Zootaxa 4282 (1), pp. 43-61 : 44

Key to the Leuctridae Klapálek, 1905 known from or expected in the Korean Peninsula

1. Tergum X and paraprocts modified. Males................................................................. 2.

- Tergum X and paraprocts unmodified. Females............................................................ 19.

2. Paraprocts forming a long subanal probe curved up over tergum IX. Body larger than 10 mm ....................................................................... Megaleuctra Neave, 1934 ; M. saebat Ham & Bae, 2002 (South Korea)

- Paraprocts curve back over tergum X at maximum. Body smaller than 10 mm ..................................... 3.

3. Paraprocts divided into paired sclerites.................................................................... 4.

- Paraprocts united into a single, though sometimes complex organ............................................... 5.

4. Inner paraproct lobe forming a specillum much longer than the reduced outer (main) paraproct lobe. No projections on terga VI–VII................................. Despaxia Ricker, 1943 ; D. asiatica Zwick, 2010 ( North Korea , South Korea)

- Specillum not much longer than the elongated apex of the outer paraproct lobe. With tergal projections on terga VI–VII ( Figs. 1–2 ).................... Leuctra Stephens, 1836 ; L. fusca tergostyla Wu, 1973 (China, Russia, North Korea, South Korea)

5. Tergum X undivided, sometimes with median furrow ( Figs. 8–9 ). Paraleuctra Hanson, 1941 ......................... 7.

- Tergum X divided into hemiterga ( Fig. 11 )................................................................. 6.

6. Tergum X with central plate between hemiterga. Sternum IX without posterior prolongation.... Rhopalopsole Klapálek, 1912 (Oriental Realm, Palaearctic China and Japan; not yet known from Korea)

- Tergum X without central plate, hemiterga nearly touching ( Fig. 11 ). Sternum IX with distinct posterior prolongation ( Fig. 12 ). Perlomyia Banks, 1906 ............................................................................... 10.

7. Cercus with a single apical projection........ P. okamotoa ( Claassen, 1936) (Russia and Japan; not yet reported from Korea)

- Cercus forked or with pair of apical teeth ( Fig. 4 )............................................................ 8.

8. Cercus forked. Subanal probe without distinct apical lobes......... P. cercia ( Okamoto, 1922) ( Russia, Japan, South Korea )

- Cercus with two apical teeth. Subanal probe with apical lobes ( Fig. 5 )........................................... 9.

9. Ventral lobes larger than dorsal lobe at the apex of subanal probe ( Fig. 7 )............ P. malaisei Zwick, 2010 (South Korea)

- Dorsal lobe larger than ventral lobes at the apex of subanal probe ( Fig. 6 )..... Paraleuctra paramalaisei sp. n. (South Korea)

10. Cercus globular, without apical spine ( Fig. 23 )............................................................. 11.

- Cercus elongated and/or with apical spine ( Fig. 19 )......................................................... 15.

11. Tergum X with a pair of mesal knobs (e.g. Fig. 19 ).......... P. mahunkai ( Zwick, 1973) ( Russia, North Korea, South Korea )

- Tergum X without knobs or spines ( Fig. 11 )............................................................... 12.

12. Tergum IX with distinct posteromedial lobe ( Fig. 16 )....................... P. koreana sp. n. ( North Korea , South Korea)

- Tergum IX with paired lobe ( Fig. 11 ), or lobe vestigial or lacking ( Fig. 19 )....................................... 13.

13. Epiproct with undivided base, apical half abruptly bent foreward ( Figs. 23, 25 )..................................................................................... P. martynovi ( Zhiltzova, 1975) (Russia, North Korea, South Korea)

- Epiroct with divided base, apical part claw-like ( Figs. 11, 13 )................................................. 14.

14. Apex of epiproct evenly bent and tapering, its tip is straight............................................................................................ P. smithae Nelson & Hanson, 1973 (China, Russia, North Korea, South Korea)

- Apex of epiproct dilated above the callus, its tip is slightly curved towards its base ( Fig. 13 ).................................................................................................... Perlomyia baei sp. n. ( South Korea)

15. Cercus short ( Fig. 19 )............................................... P. lamellata sp. n. ( North Korea , South Korea)

Figures

FIGURES 1 – 3. Terminalia of Leuctra fusca tergostyla (Wu, 1973) comb. n., China, Beijing— 1: male, lateral view; 2: male, dorsal view; 3: female, ventral view—scale 1 mm.

FIGURES 4 – 10. Terminalia of Korean endemic Paraleuctra Hanson, 1941 species— 4 – 6, 8, 10: P. paramalisei sp. n., male holotype and female paratype, South Korea, Chungcheongbuk Province; 7, 9: P. malaisei Zwick, 2010, South Korea, Gangwon Province; 4: male terminalia, lateral view; 5: male terminalia, oblique ventrocaudal view; 6 – 7: male subanal probe, lateral view; 8 – 9: male terminalia, dorsal view; 10: female terminalia, ventral view—scale 0.5 mm.

FIGURES 11 – 15. Terminalia of Perlomyia baei sp. n., paratypes, South Korea, Gapyeong Province— 11: male terminalia, dorsal view; 12: male terminalia, ventral view; 13: male terminalia, lateral view; 14: female sterna 7 – 8, lateral view; 15: female terminalia, ventral view—scale 0.5 mm.

FIGURES 23 – 25. Male terminalia of Perlomyia martynovi (Zhiltzova, 1975), South Korea, Chungcheongbuk Province— 23: dorsal view; 24: ventral view; 25: lateral view— scale 0.5 mm.

FIGURES 19 – 22. Terminalia of Perlomyia lamellata sp. n., paratypes, South Korea, Gangwon Province— 19: male terminalia, dorsal view; 20: male terminalia, ventral view; 21: male terminalia, lateral view; 22: female sterna 7 – 8, ventral view—scale 0. 5 mm.

FIGURES 16 – 18. Male terminalia of Perlomyia koreana sp. n., paratype, South Korea, Gyeongsangbuk Province— 16: dorsal view; 17: ventral view; 18: lateral view— scale 0.5 mm.