Alavesia longistylata Zhang and Wang
Creators: name: Sinclair, Bradley J.
name: Grimaldi, David A.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Atelestidae
Alavesia
Alavesia longistylata

description: Alavesia longistylata Zhang and Wang   Figures 1H, 3A, 6B–C, 9E, 11A, 14B–C  
 Alavesia longistylata Zhang and Wang in Zhang et al., 2020.   
 DIAGNOSIS: Like A. longicornuta, sp. nov., males characterized by greatly lengthened aristalike stylus (2 × length of postpedicel) (fig. 14B, C), bearing an apical, flaglike expansion; palpi elongate, narrow, projecting; CuA strongly recurved, cell cua truncate; M 1+2 and R 4+5 parallel. Differences with A. longicornuta given in diagnosis of that species.   
 REDESCRIPTION: Male. Coloration, except stylus, not preserved. Head: Scape and pedicel quadrate, subequal in size and length. Postpedicel greatly lengthened (fig. 1H), L/ W 3.3, tapered throughout, longer than head height. Stylus with two small basal articles, apical aristalike stylus 2 × length of postpedicel; apex of stylus with darkened, flaglike flattened expansion, twice width of apex of postpedicel. Palpus slender and elongate, tapered apically (fig. 9E), length about two-thirds as long as eye height; ventral edge with short, erect setulae; apex with several longer, curved setulae.   
 Thorax: Chaetotaxy thickened: uniserial row of short acrostichal setae; dorsocentral setae similar to acrostichals, ending in pair of long prescutellar dorsocentral setae; 1 anterior and 1 posterior postpronotal seta; 4 anterior notopleural setae of variable lengths, 1 posterior notopleural seta; 1 postsutural supraalar seta; 1 postalar seta; 1 pair of apical scutellar setae.   
 Legs: Forecoxa with short erect anterior setae; anteroapical setae longer and stouter. Femora (fig. 11A) with anteroventral row of short setae. Mid and hind coxae with 2–3 stout lateral setae on apical half. Tibiae with biserial row of short, stout ventral setae; apex of tibiae with long, apical ventral seta; hind tibia with dorsal row of setae, length about half width of tibia.   
 Wing: Length 1.9 mm (fig. 3A), costa terminating slightly beyond M 1+2; Sc nearly reaching costal margin; R 4+5 parallel to M 1+2, slightly divergent near wing margin; crossvein r-m opposite near middle of cell dm; apex of M 4 equal distance between M 1+2 and CuA+CuP; CuA straight, strongly recurved; apex of cell cua truncate, length of cell cua shorter than cell bm; CuA+CuP mostly straight, curved subapically to wing margin.   
 Abdomen: Setae short, without distinct posteromarginal setae. Segments 1–5 broad, remaining segments retracted with segment 5. Terminalia (fig. 6B, C): cercus finely setose; truncate apically. Epandrium U-shaped with broad dorsal bridge anterior to cerci; row of ~7 long setae along posteroventral margin, half length of epandrium. Surstylus very narrow and elongate, digitiform, projecting nearly vertically from epandrium, slightly shorter than apical epandrial setae; surstylus having thinner, shorter dorsal lobe. Phallus slender, sclerotized projection; strongly bent subapically with apex arched ventrally, tip microsetulose.   
MATERIAL EXAMINED: Male, USNM PAL 726872.
description: Published as part of Sinclair, Bradley J. & Grimaldi, David A., 2020, Cretaceous diversity of the relict genus Alavesia Waters and Arillo (Diptera: Empidoidea: Atelestidae), pp. 1-40 in American Museum Novitates 2020 (3961) on pages 25-26, DOI: 10.1206/3961.1, http://zenodo.org/record/5370399