Pseudostilobezzia Wirth & Ratanaworabhan 1973
Creators: name: Borkent, Art
name: Grogan, William L.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Ceratopogonidae
Pseudostilobezzia

description: Pseudostilobezzia Wirth & Ratanaworabhan
Pseudostilobezzia Wirth & Ratanaworabhan, 1973: 177. Type species: Pseudostilobezzia macclurei Wirth & Ratanaworabhan, by original designation.
DIAGNOSIS: Female adult: the only genus of Ceratopogonidae with an elongate claw and basal tooth nearly or equal in length to the foretarsomere 5 and a short claw (with basal tooth) on the mid- and hind tarsomeres 5 (Figs. 1D–F). Male, pupa and larva: unknown.
DESCRIPTION: Female adult: Head capsule: with or without transverse sulcus; frons extending from vertex to frontoclypeus; vertex with single seta located medially; posterior tentorial pit separated from postoccipital ridge by very narrow gap; antennal flagellomere 13 tapering gradually to apex; antennal scape with dorsomedial projection, with setae; antennal flagellum without sensilla coeloconica; frontoclypeus a single unit (no transverse suture); frontoclypeus dorsolaterally connected to eye by narrow bridge of cuticle; labrum apically bifid, with apical pegs directed ventrolaterally, small lateral teeth; base of labrum with 2 sensilla (on each side); mandible with 7–8 coarse teeth; mandibular arm originating on ventral margin of eye, articulating with base of mandible near apex of frontoclypeus; cardo and/or stipes fused medially; apex of cardo abutting but separate from posterior tentorial pit; with five palpal segments; palpal segment 3 with capitate sensilla arranged on surface or in small, round pit; prementum medial suture forked dorsally; anterior cervical sclerite triangular. Thorax: antepronotum with very slender transverse band medially; basisternal ventrolateral projection, from anterior view, broad, tapering to point; proepisternum, basisternum separate; lateral arm of prosternal apophysis of more or less constant width; postpronotum triangular; scutum with acrostichal setae, dorsocentral setae present, without modification on posteromedial margin, with scutal suture situated anterior to group of prealar setae, with three ventrally directed apodemes arising from well-separated bases, distinctly separated from one another; paratergite without setae; anterior anepisternum with dorsal point of suture posterior to anterior spiracle, with posterior margin more or less evenly curved, without setae; with broad anepisternal cleft, paratergite slender; anapleural suture short, extending to posterior margin of anepisternal cleft or just short of it; katepisternum without setae; katepisternal suture present, extending to anterior margin of katepisternum. Wing: length = 1.13–1.20 mm; margin with one or more costal setae set apart basal to level of the arculus; with 2 radial cells (r 1, r 2), first radial cell rhomboidal to elongate; radial vein with single seta just distal to the arculus, set apart from more apical setae on radial vein; with about four setae near apex of R 3 (observed only with P. curtitarsus); without R 4+5; r-m moderately long; M 1, M 2 forking beyond crossvein r-m, with petiolate base; without or few macrotrichia restricted to apex of wing; microtrichia forming minute to somewhat elongate spicules, more or less evenly spaced. Legs: ratio of foretibia length/ hind tibia length 0.86–0.87; trochanter of fore-, midleg each with pair of thick, contiguous setae; forefemur slender, without ventral spines; hind femur with only slender or stout setae; midtibia lacking spur, with simple subapical setae; hind tibial comb with 6–7 spines; foreleg tarsal ratio (Ta1/Ta2)/ hind leg tarsal ratio 0.82–1.13; midtarsomere 1 without palisade setae; hind tarsomere 1 with two complete, at least partial third row of palisade setae, hind tarsomere 2 with (or without? not reported for P. wirthi, P. macclurei) row of palisade setae; hind tarsomere 1 2.22–3.04 times longer than tarsomere 2; foretarsomere 5 nearly equal in diameter to midtarsomere 5; tarsomeres 4 cordiform; tarsomeres 5 with ventral setae; empodia absent; each leg with single claw and elongate tooth on fore-and midlegs, short or elongate tooth on hind claw. Abdomen: tergite 1 with dorsolateral longitudinal ridge; pigmentation of segments 7–10 more or less uniform; without tergal apodemes, eversible sacs; tergites 6–8 progressively shorter; sternites 7–8 similar in length, each shorter than sternite 6; sternite 8 with elongate, posteriorly directed, straight setae, more or less evenly spaced; sternite 8 with posteromedial cleft moderately U-shaped; without dorsally directed slender apodeme arising from posterior margin of sternite 8; sternite 9 with more laterally placed, elongate, slightly curved setae, directed posteriorly or posterolaterally; tergite 9 entire, undivided medially; without genital fork; sternite 9 discontinuous medially, forming two well-developed, expanded halves; with unmodified hypogynial valve; with more anteriorly placed hypoproct setae (not two posterior ones) tapering to, at most, a gently curved apex; with 3 spermathecae, 2 well-developed, one significantly smaller.
Eggs (in vivo): very elongate, slender.
Male, pupa, larva: unknown.
description: Published as part of Borkent, Art & Grogan, William L., 2024, A new species of Pseudostilobezzia Wirth & Ratanaworabhan (Diptera: Ceratopogonidae) from Vietnam, pp. 128-134 in Zootaxa 5448 (1) on pages 129-130, DOI: 10.11646/zootaxa.5448.1.8, http://zenodo.org/record/11231346