A new species of Brachypremna (Diptera: Tipulidae) from Dominican amber, with a key of the genus to all fossil species Author Men, Qiulei School of Life Sciences, Provincial Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui Province, Anqing Normal University, Anqing 246011, Anhui, P. R. China; E-mail: menqiulei 888 @ 126. com Author Hu, Zhengkun Administrative Bureau of Fanjingshan National Nature Reserve, Jiangkou 554400, Guizhou, P. R. China text Zoological Systematics 2020 45 3 236 240 journal article 10.11865/zs.202027 2095-6827 5360631 B993A757-C27B-4732-94E4-136A4EB6D5C9 Brachypremna chenhuameii sp. nov. ( Figs 1–2 ) Diagnosis. The new species can be recognized by following combination of characters: final part of Scabsent, R 5 straight except arched base, R 5 and M 1 divergent; gonocoxite elongated, broad basally and narrowed to the apex, outer gonostylus narrowed, inner gonostylusin the shape of broad lobe, longer than outer gonostylus. The new species is most similar to another fossil species from Dominican amber, B. brodzinskii Krzeminski, 1996, but differs from the latter by the absence of final part of Sc (present in related species), the origin of Rs obliquely arcuated (the origin of Rs right-angled in shape in related species), the petiole of cell m 1 subequal in length to M 2 (the petiole of cell m 1 distinctly shorter than M 2 in related species), the petiole of cell m 1 distinctly longer than the cross vein m-m (the petiole of cell m 1 subequal in length to cross vein m-m in related species), and the discal cell 2.2 times as long as the width (the discal cell 1.7 times as long as the width in related species). Figure 1. Brachypremna chenhuameii sp. nov. , No. AQNU-DIP-2019004. A. Body, dorsal view. B. Wing. C. Stigma and terminal of Sc. D. Hypopygium, lateral view. Arrow indicates the position of final part of Sc. Scale bars: A–B =1.0 mm; C–D = 0.2 mm. Figure 2. Brachypremna chenhuameii sp. nov. , No. AQNU-DIP-2019004. A. Antenna. B. Palpus. C. Wing. D. Hypopygium, dorsolateral view. E. Hypopygium, ventrolateral view. Abbreviations: goncx—gonocoxite; IG—inner gonostylus; OG—outer gonostylus. Scale bars: A–B, D–E = 0.2 mm; C =1.0 mm. Material examined. Holotype , male, No. AQNU-DIP-2019004, Miocene (18–20 Ma), La Toca mine, Santiago Province , the Dominica Republic. Description. Measurement ( n = 1). Body length 8.36 mm (excluding antenna), wing 10.80 mm , antenna 5.27 mm . Head. Head brown with black setae ( Fig. 1A ). Nasus distinct with several black setae on tip. Antenna entirely black, 11-segmented, scape and pedicel cylindrical, slightly expanded apically, first flagellomere subequal in length to scape and pedicel together, remaining flagellomeres progressively shorter and thinner except last segment which is same length to second flagellomere, each flagellomere with numerous black verticils, longest verticil distinctly shorter than its corresponding flagellomere ( Fig. 2A ). Palpus wholly black, longer than antenna, last segment almost same length to basal three segments together ( Fig. 2B ). Thorax. Thorax brown ( Fig. 1A ). Legs wholly brown ( Fig. 1A ). Fore leg with femur 8.02 mm , tibia 8.61 mm , tarsi 12.90 mm ; middle leg with femur 9.91 mm , tibia 9.20 mm ; hind leg with femur 10.50 mm . Wing brown with dark brown venation, narrowed and elongated, transparent, with an elliptic stigma not reaching anterior margin of wing ( Fig. 2B ). Venation: Sc long, ending distinctly beyond mid-point of wing, sc-r reaching at same level of branch of Rs, final part of Sc absent ( Figs 1C , 2C ); Rs distinctly arcuate at base, slightly longer than R 2+3+4 ; R 1 and R 3 short; R 4 elongated, apical one third curved; R 5 elongated, straight except base arched, R 5 and M 1 divergent; cell m 1 present, slightly longer than its petiole; M 2 as long as petiole of cell m 1 ; r-m absent; discal cell elongated, approximately 2.2 times as long as width; m-m distinctly shorter than petiole of cell m 1 ; m-cu reaching discal cell at distal one fourth; CuA and CuP relatively straight with apex slightly bent, A 1 straight. Halter with stem yellow, knob black ( Figs 1B , 2C ). Abdomen. Abdomen brown with hypopygium black ( Figs 1A, 1D ). Tergite nine small, straight at hind margin ( Fig. 2D ). Gonocoxite elongated, broad basally and narrowed to apex, densely covered with long setae ( Figs 2D–E ). Outer gonostylus being narrowed rod, inner gonostylus longer than outer, being broad lobe ( Figs 2D–E ). Etymology. This specific name is dedicated to Mrs. Chen Huamei for her contribution of this Dominican amber. Key to fossil species of Brachypremna . 1. Cross vein r-m present ................................................................................................................................................... B. gurnetensis Cross vein r-m absent........................................................................................................................................................................... 2 2. Origin of Rs obliquely arcuated, petiole of cell m1 distinctly longer than cross vein m-m............................ B. chenhuameii sp. nov. Origin of Rs right-angled in shape, petiole of cell m1 subequal in length to cross vein m-m ......................................... B. brodzinskii