Bicaubittacus Tan & Hua

Tan, Jiang-Li & Hua, Bao-Zhen, 2009, Bicaubittacus, a new genus of the Oriental Bittacidae (Mecoptera) with descriptions of two new species, Zootaxa 2221, pp. 27-40 : 29-30

Key to species of Bicaubittacus Tan & Hua , gen. nov. (male)

1. Gonocoxites prolonged caudally, then divided into two long columnar prolongations ( Figs 1 B, 2A, 3A); apex of proctiger emarginated into two unequal processes, roughly L-shaped, dorsal (subapical) one rounded and broad, ventral (apical) one slender, tapering apically .............................................................................................................. 2

- Gonocoxites not prolonged caudally, with a large flat prolongation on each side ( Figs 7 A, C); apex of proctiger

rounded without process; China................................................ Bi. longiprocessus ( Huang & Hua, 2005), comb. nov. 2. Posterior margins of terga VI–VIII deeply emarginate, V-shaped ( Fig. 4 D)); posterior angles of terga VI–VII blackish brown....................................................................................................................................................................... 3

- Posterior margin of tergum VII straight; posterior angles of terga VI–VII yellowish brown ...................................... 4

3. Dorsal margin of epandrial appendage extending ventro-mesad into a large subtriangular lobe ( Figs 2 A, B); gonostylus short, with an upturned, truncate, flat and broad apex ( Fig. 2 C); China................................................................... ............................................................................................... Bi. appendiculatus ( Esben-Petersen, 1927) , comb. nov.

- Dorsal margin of epandrial appendage extending caudo-mesad into a long sabre-shaped lobe with a row of black spines ( Figs 4 A, D); gonostylus long and slender ( Fig. 4 C); China.................................................. Bi. yangi , sp. nov.

4. Epandrial appendage forked apically into a pair of slender prongs, similar size in lateral view; distal prolongations of gonocoxites without thick setae; cerci pointed apically; gonostylus short and slender, oblique straight in lateral view; Myanmar....................................................................................................... Bi. burmanus ( Tjeder, 1974) , comb. nov.

- Epandrial appendage strongly cleft apically into a short upper prong and a large lower elongation, distinctly longer and broader than the upper prong from lateral view ( Figs 5 B, 6A); distal prolongations of gonocoxites with a row of long thick black setae ( Figs 6 A, G); cerci flat and broad, apex rounded ( Fig. 6 A); gonostylus long, L-shaped in lateral view ( Fig. 6 F); China.................................................................................................... Bi. mengyangicus , sp. nov.

Figures

FIGURE 1. Bicaubittacus appendiculatus. A. Male adult; B. Male genitalia, lateral view.

FIGURE 2. Bicaubittacus appendiculatus, genitalia. A – C. Male: A. Terminal abdominal segments, lateral view; B. Right epandrial appendage, mesal view; C. Aedeagus and gonostylus, lateral view. D – G. Female: D. Abdominal segment X, dorsal view; E. ibid, ventral view; F. Posterior abdominal segments, lateral view; G. Subgenital plate, ventral view.

FIGURE 4. Bicaubittacus yangi sp. nov., male genitalia. A. Genitalia, lateral view; B. Ventro-basal process of right epandrial appendage, inner view; C. Left gonostylus and part of cercus and gonocoxite, lateral view; D. Epandrial appendages, dorsal view.

FIGURE 5. Bicaubittacus mengyangicus sp. nov. A. Male adult, lateral view; B. Male genitalia, lateral view.

FIGURE 6. Bicaubittacus mengyangicus sp. nov., male genitalia. A. Genitalia, lateral view; B. Epandrial appendages, dorsal view; C. Basal half of epandrial appendage, meso-dorsal view; D. Dorso-mesal processes of basal half epandrial appendage, inner caudal view; E. Distal half of epandrial appendage, inner view; F. Gonostylus and part of gonocoxite, lateral view; G. Distal prolongations of gonocoxites, lateral view; H. Genitalia with distal prolongations omitted, caudal view.

FIGURE 7. Bicaubittacus longiprocessus, genitalia. A – C. Male: A. Genitalia, lateral view; B. Epandrial appendages, dorsal view; C. Genitalia, caudo-ventral view. D – G. Female: D. Subgenital plates, ventral view; E. Terminal abdominal segments, lateral view; F. Abdominal segment X, dorsal view; G. ibid, ventral view.