Trichomyia muiraquita Araújo & Bravo, 2018

Araújo, Maíra Xavier & Bravo, Freddy, 2018, A new species of Trichomyia (Diptera: Psychodidae: Trichomyiinae) and report of antennal sensilla in adult, Papéis Avulsos de Zoologia (e 20185837) 58, pp. 1-5 : 2-3

Trichomyia muiraquita Araújo & Bravo sp. nov.

( Figs. 1 A‑F; 2A‑D)

Material examined: Brazil, Amazonas, Manaus, Mata da Universidade Federal do Amazonas ( UFAM), 15-30. IV.2014, holotype, male, A. Silva-Neto coll. ( MZFS). 2 males paratypes, same locality, data and collector than holotype ( BMNH) ; 4males paratypes, Amazonas, Manaus, Rodovia AM 010 km 26, Reserva Florestal Adolpho Ducke , IX.2001, J.F.Vidal coll. ( MZFS) .

Etymology: From Tupi, muyrá, “tree”, “wood” and quitã, “node”, “object rounded shape”, for an amulet sculpture in stone or wood produced by the Brazilian Indigenous people of the Lower Amazon, and it refers to the compact shape of the male terminalia of the new species.

Distribution: Known only from Brazil,state of Amazonas.

Diagnosis: Maxillary palpus with four segments, the first two separated by a narrow articular area; sensorial pit present in the first two segments of the palpi. Halter with three small spiniform bristles in the medium posterior area. Gonocoxite with robust arm, perpendicular to aedeagus. Presence of post-hypandrial plate. Gonostylus apically bifurcated. Hypoproct bilobed.

Female: Unknown.

Description

Head: Head subcircular in frontal view, rounded eyes, without eye bridge. Supraocular bristles arranged in two rows. Antennal sockets quadrangular ( Figs. 1A ). Palpus with four segments, with the first two proximal separated by a narrow articular area; first and second segment with sensilla in concave pit on medial surface; palpus formula 1.0:0.5:0.7:1.0 ( Fig. 1B ). Antenna incomplete in the studied specimens; scape subcylindrical; pedicel subspherical; basal flagellomeres fusiform and centric; ascoids long and C-shaped, larger than the flagellomeres ( Fig. 1C ).

Thorax: Presence of bristles in the scutum, scutellum, and anepimeron; postnotum quadrangular and katepisternum wider than long ( Fig. 1F ).

Wing: Wing broad and oval;radial fork apical to the apex of the vein CuA₂;medial fork incomplete at base,basal to radial fork;r-m and m-cu absent ( Fig.1E ). Halter with three short spiniform bristles in the medium posterior area ( Fig. 1D ).

Male terminalia: Hypandrium fused to gonocoxites and expanded posteriorly as a plate covering the aedeagus, slightly sclerotized, with lateral short bristles. Arm of gonocoxite directed to the dorsal region of the genitalia, perpendicular to aedeagus, with long bristles in the internal and external sides ( Figs. 2A, 2B ). Gonostylus articulated ventrally to gonocoxite, strongly sclerotinized, without bristles, curved and bifurcated at apex ( Figs. 2A, 2B, 2C ). Hypoproct slightly bilobed with apical micropilosity. Epandrium wider than long, without bristles. Cercus ovoid with curved margin in ventral view ( Fig. 2D ).

Remarks: Twenty seven species of Trichomyia with four segments, with the first and second segments close together and separated by reduced articular membrane, are known, and they are exclusive to the Neotropics (Araújo & Bravo, 2016; Araújo et al., 2017a). Between these 27 species of Trichomyia , only in seven species the gonocoxite fused with hypandrium is expanded posteriorly as a plate, all of them included in the subgenus Opisthotrichomyia Bravo, 2001 : T. brevitarsa (Rapp, 1945) ; T. festiva Bravo, 2001 ; T. fluminensis Bravo, 2001 ; T. nocturna Bravo, 2001 ; T. pantanensis Araújo & Bravo, 2017; T. riodocensis Alexander, Freitas & Quate, 2001 and T. vargasi (Barretto, 1954) . Trichomyia muiraquita sp. nov. differentiated from the seven species of Trichomyia (Opisthotrichomyia) because in the new species the gonocoxite has a perpendicular arm in relation to aedeagus that is absent in all species of Opisthotrichomyia . At this moment, it is impossible to place this new species in any known subgenus.

Figures

Figures 1A-G.Trichomyia muiraquita sp.nov.(A) Head,anterior view;(B) Palpus;(C) Scape,pediceland basal flagellomeres;(D) Halter;(E) Right wing;(F)Thorax.

Figures 2A-D. Trichomyia muiraquita sp.nov.(A) Male terminalia, lateral: gonocoxite, arm of gonocoxite,gonostilus, epandrium, post-hypandrial plate; cerci and aedeagus;(B) Male terminalia,dorsal: arm of gonocoxites,post-hypandrial plate, aedeagus, right gonostylus;(C) Apex of gonostylus,lateral; (D) Cerci,epandrium and hypropoct.(Abbreviations:agx = arm of gonocoxite,aed = aedeagus,gst = gonostylus,hyp = hypoproct,pph = plate pos-hipandrial).