Tyloperla, Sivec & Stark, 1988

Stark, Bill P. & Sivec, Ignac, 2005, New Species Of Tyloperla (Plecoptera: Perlidae) From Vietnam And Thailand, Illiesia 1 (1), pp. 1-7 : 7

Key to Tyloperla Males

( T. sauteri and T. sinensis not included)

1. Aedeagal sac with a pair of basolateral lobes ( Fig. 13 )………………………………………………...2

Aedeagal sac tubular, basolateral lobes absent ( Fig.18 ).........………………………………....... T. khang

2. Tergum 8 without a distinctly produced mesal lobe ( Fig. 2 )……………………………………………3

Tergum 8 with a distinctly produced,esal lobe ( Fig. 11 )………………………………………….……..4

3. Basal cushion of hemitergal lobes more than half as long as inner length of process; aedeagal sac with largest spines forming a band distal to small ear shaped lobes; known from Taiwan ……….……………………………. T. formosana

Basal cushion of hemitergal lobes about 1/3 as long as inner length of process ( Fig. 2 ); aedeagal sac with largest spines forming a dense subapical patch ( Fig. 4 ); known from Thailand ……………………………………………… T. courtneyi

4. Hemitergal processes slender throughout length and reaching well beyond hind margin of tergum 9……………………………….….. T. attenuata

Hemitergal processes broad at base and reaching, at most, hind margin of tergum 9.……………………………………………………….…5

5. Aedeagal sac armature continuous laterally near base of lobes ( Fig. 13 ); apical region of aedeagal sac offset by a subapical groove ( Fig. 13 ); known from Vietnam ……………………………………. T. illiesi

Aedeagal sac armature divided laterally near base of lobes into two patches; apical region of aedeagal sac without subapical groove; known from Assam……………………………………..… T. schmidi

Figures

Figs. 11-17. Tyloperla khang. 11. Head and pronotum. 12. Male terminalia. 13. Hemitergal process, dorsal. 14. Hemitergal process, lateral. 15. Aedeagus, lateral. 16. Female terminalia. 17. Vagina and spermateca.

Figs. 18-20. Tyloperla khang egg structures. 18. Entire egg, lateral. 19. Egg collar end with anchor. 20. Opercular ring and lid.

Figs. 1-6. Tyloperla courtneyi. 1. Head and pronotum. 2. Male terminalia. 3. Hemitergal process, dorsolateral. 4. Aedeagus, lateral. 5. Female terminalia. 6. Vagina and spermatheca.