Arthropeina pseudofulva Fachin & Amorim, 2014, sp. nov.
Creators: name: Fachin, Diego Aguilar
name: Amorim, Dalton De Souza
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Xylomyidae
Arthropeina
Arthropeina pseudofulva

description: Arthropeina pseudofulva, sp. nov.
(Figs. 7, 50–55, 59, 65, 76–77, 83, 89)
Diagnosis (female). Body color mostly whitish yellow to reddish yellow (Figs. 83, 89). Thorax mostly whitish yellow except for scutum reddish yellow (Fig. 65). Legs mostly whitish yellow, including hind coxa (Fig. 89). Projection of posterior margin of genital fork very short, nearly indistinguishable (Figs. 50–52). Spermathecal capsule helicoid, with three coils (Fig. 53).
Material examined. HOLOTYPE, ♀, BRAZIL, Rondônia, Campo Novo, Fazenda Amorim, 10º40.6’S 63º29’0”W, Malaise trap 6m, 06–10.xii.2011, Amorim, Ament e Riccardi col. (MZUSP). PARATYPES: 1 ♀, BOLIVIA, Santa Cruz Dist., 4 km N Bermejo, Refugio Los Volcanes, 18°06’S 63°36’W, AR Cline, 1000m, 25–30.x.2007, Malaise trap. (CSCA). 1 ♀ (left antenna and left wing slide–mounted), BRAZIL, Monte Negro, Fazenda Amorim, 10°40.6’S 63°29’0”W, 248m, Malaise trap, 03–15.xii.2011, Amorim, Ament e Riccardi col. (MZUSP).
Description. Female. Length: body, 6.5–9.0 mm; wing, 6.0– 7.5 mm. Head. Vertex pale, setation whitish yellow. Upper frons reddish yellow. Flagellomeres 1–3 brownish on outer margin, paler ventrally on inner margin; flagellomeres 4–8 dark brown to black; length of eighth flagellomere five times length of seventh (Fig. 7). Palpus (Fig. 77) whitish yellow, elongate; basal segment cylindrical, length two times its width; apical segment oval, length two times its width, 1.7 times length of basal segment, both with pale hairs. Thorax (Fig. 65). Entirely whitish yellow to yellow, except scutum reddish yellow; postpronotal lobes whitish yellow, notopleural strip brownish, moderately contrasting with scutum color. Scutellum whitish yellow. Legs. Mostly reddish yellow, except for tarsomeres brownish, hind trochanters, hind femora apically and hind tibiae brown to black. Wing as in Fig. 76. Halter pale, knob yellow whitish. Abdomen. Reddish yellow, with black transverse bands on tergites; sternites unsclerotized; tergites mostly black, except tergite 1 with a thin transverse black distal line; tergites 7–8 weakly sclerotized. Female genitalia (Figs. 50–55). Tergite 8 wide, more or less rectangular, slightly rounded anteriorly. Sternite 8 more or less oval (Fig. 54), narrowing towards apex; gonapophyses slightly sclerotized, strongly bilobed, rounded apically. Tergite 9 wider distally (Fig. 51). Genital fork with anterior arm rounded, clearly narrower than posterior arm (Figs. 50, 52); membranous lobes of genital fork wide, rounded, covering the posterolateral process; projection of posterior margin very short; margin between posterior projections with a moderate medial incision; genital opening more or less oval, widest medially; lateral membrane of bursa sclerotized with a few microtrichia. Three spermathecae present (Fig. 59), lateral ones with short ducts, more sclerotized posteriorly, with a distinct rounded valve near middle; spermathecal capsules more or less ovoid, helicoid, with three coils, strongly sclerotized (Fig. 53). Cercus of first segment moderately compressed, wider basally than distally; length of segment 1 of cercus more than twice that of segment 2.
Male. Unknown.
Etymology. The species name is feminine and the specific epithet adds to fulva the Greek root pseudo, for false, considering its similarity with A. fulva, but actually being a different species.
Geographic distribution. Northern Brazil (State of Rondônia) and Bolivia (Fig. 92).
Comments. This species closely resembles A. fulva, mainly due to the general body color. The hind coxa color may be misleading because some specimens of A. fulva can have a yellow hind coxa, as in A. pseudofulva (see comments on A. fulva). The antenna is also similar in both species, with the same relative lengths of flagellomeres 7–8. Nevertheless, A. pseudofulva can be easily discerned from A. fulva based on the shape of the genital fork—with the projection of the posterior margin very short, nearly indistinguishable—the shape of the genital opening, and the helicoid spermathecal capsules.
The distributions of the two species (Fig. 92) also differ. Arthropeina fulva is restricted to southern Brazil, except for a single record for the State of Mato Grosso, in western Brazil. Arthropeina pseudofulva is restricted to western Amazonia and Bolivia.
description: Published as part of Fachin, Diego Aguilar & Amorim, Dalton De Souza, 2014, Taxonomic revision of the Neotropical genus Arthropeina Lindner, 1949 (Diptera: Xylomyidae), pp. 231-257 in Zootaxa 3827 (2) on pages 253-255, DOI: 10.11646/zootaxa.3827.2.6, http://zenodo.org/record/226503