Saigusaia Vockeroth 1980

Niu, Xiaoling, Wu, Hong & Yu, Xiaoxia, 2008, Four new species of Saigusaia Vockeroth, 1980 (Diptera: Mycetophilidae) from China, Zootaxa 1741, pp. 24-30 : 24-25

Key to the species of Saigusaia Vockeroth 1980 known from China

1. Tergite IX broadened apically ( Figs. 3, 5 , 7,9); hypopygium not elongate, gonostylus simple ( Figs. 7–8 ) or with posterior protuberance bearing at most 1 black spine.........................................................................2

-. Tergite IX weakly tapered apically ( Fig. 1 ); hypopygium elongate ( Fig. 2 ); gonostylus with strong thumblike lateral protuberance bearing two long black spines ............... Saigusaia aberrans Wu et Niu, sp. nov.

2. Shoulders, proepisternum, meskatepisternum yellow.................................................................................3

- Shoulders, proepisternum, meskatepisternum blackish brown....................................................................4

3. Gonostylus strongly swollen distally, lacking strong thumb-like lateral spine-bearing protuberance ( Figs. 3-4 ); ventral portion of tergite IX broadly emarginate (Fig. 12). Saigusaia praegnans Wu et Niu , sp. nov.

- Gonostylus slightly swollen apically, with strong thumb-like lateral protuberance bearing one long black spine ( Figs. 5-6 ); ventral portion of tergite IX narrowly emarginate (Fig. 13) ............................................. ................................................................................................. Saigusais monacanthus Wu et Niu, sp. nov.

4. Gonostylus with small indentation on posterolateral margin at its mid-length and two rows of short spinelike setae apicomedially ( Fig. 7 ) ........................................... Saigusais spinibarbis Wu,Yu et Niu, sp. nov.

- Gonostylus simple, normal ( Fig. 9 ) ........................................................... Saigusaia taiwan Saigusa, 1968

Figures

FIGURES 1 – 9, Male genitalia. 1. S. aberrans, sp. n., dorsal view. 2, S. aberrans, sp. n., ventral view (ceri and proctiger omitted). 3, S. praegnans, sp. n., dorsal view. 4, S. praegnans, sp. n., ventral view (ceri and proctiger omitted). 5, S. monacanthus, sp. n., dorsal view. 6, S. monacanthus, sp. n., ventral view (ceri and proctiger omitted). 7, S. spinibarbis, sp. n., dorsal view. 8, S. spinibarbis, sp. n., ventral view (ceri and proctiger omitted). 9, S. taiwan, dorsal view. Scale bar = 0.10 mm.