Pelecinobaccha unica

Miranda, Gil Felipe Gonçalves, Marshall, Stephen A. & Skevington, Jeffrey H., 2014, Revision of the genus Pelecinobaccha Shannon, description of Relictanum gen. nov., and redescription of Atylobaccha flukiella (Curran, 1941) (Diptera: Syrphidae), Zootaxa 3819 (1), pp. 1-154 : 80-81

Pelecinobaccha unica Miranda sp. nov.

Map 10. Figure 41 (a–e).

Type locality. Costa Rica, Puntarenas, Camino a Las Tablas, 1200m, 9°02'N 82°53'W. Holotype male INBio.

Male. Head: Black. Face lateral 1/6 pale, homogenously covered with white pollen except for tubercle apex. Lunule pale dorsal to antennal insertions, central black macula disconnected from frontal triangle color. Frontal triangle with pair of linear white pollinose maculae laterally connected to pollen from face by narrow lateral vittae of differently oriented pollen. Vertical triangle with most black pile forming a central single row ending dorsal to anterior ocellus; ocellar triangle separated by its length from posterior eye margin. Eye contiguity as long as vertical triangle length. Eye with posterior indentation at level of antenna insertion. Antennal insertions almost separated, medial division unsclerotized on dorsal ⅓. Occiput with dull dark pollen on dorsal ¼ and with white pollen on ventral ¾; dorsal ¼ of occiput with 2 regular rows of simple black pile, anterior one shorter; middle ½ with 3–4 regular rows of pile, posterior row with very long scale-like white pile, anterior rows with shorter pile, simple and black on dorsal ½, scale-like and white on ventral ½; ventral ¼ with 2–4 rows of scale-like white pile, rows become irregular ventrally.

Thorax: Scutum black, mainly brown dull pollinose, except white on notopleuron; scutum with erect black pile, slightly longer on notopleuron anterior to transverse suture, and with anterior row of shining white pile interrupted in the middle. Scutellum black, black pilose, pile slightly longer than on scutum, sub-scutellar fringe long and white medially otherwise black. Pleuron black, with longer microtrichia on anterior ¾ of the katatergite and on the metaepimeron; pleuron white pilose except black pilose dorso-posteriorly on posterior anepisternum and anterior anepimeron. Plumula long and white. Calypter white, pile dark brown. Halter yellow, capitulum light orange.

Wing: Mostly brown, becoming gradually diffuse around apical 1/5, cells c and sc darker, entirely microtrichose; alula diffusely brown, basally 1.3 times to apically 3.2 times as broad as c cell, entirely microtrichose.

Legs: Legs dark brown. Metabasitarsomere apical ¼ until the 4th metatarsomere pale. Pile white laterally on metacoxa and on pale regions.

Abdomen: Dark brown, ~3 times as long as scutum. First tergite entirely white pilose, long pile undulated apically. Second tergite long, length ~4.5 times minimum width, with central rectangular region of black dull pollen, pollen expanding laterally subapically; 2nd tergite with short, appressed and black pile except long, erect and white basally and laterally. Third tergite trapezoidal and long, length ~2.5 times minimum width, pale on basolateral ½ and on inconspicuous baso-median pair of vittae; 3rd tergite with large central triangular region of dull black pollen, and mainly with appressed and black pile, except erect, white and slightly longer on baso-lateral ½. Fourth tergite sub-quadrate, slightly wider than long, with short appressed black pile, and pollen distribution as on 3rd. Fifth tergite rectangular and wide, pollen area reduced; remaining characteristics as on 4th. Genitalia: Cercus with 1–2 rows of pile on medial margin and 3 rows on lateral margin. Surstylus long, sub-oval on lateral view, directed apically, with long pile on baso-dorsal ⅔, with setulae (around 30) ventrally, setulae become weaker posteriorly and sparse basally and posteriorly. Subepandrial sclerite rectangular, with narrow long apico-lateral extensions connected to the base of the surstyli, and long baso-lateral extensions. Hypandrium narrow on apical 3/5 and rounded on basal 2/5, long, dorsal arc with long surface, base and apex very distanced from each other, with ventral notch extending to anterior 3/5. Phallapodeme long, mostly weakly sclerotized but well sclerotized on a narrow sub-dorsal region extending towards the apex. Basiphallus rectangular in lateral view, with posterior extremity normal; distiphallus apex slightly curving apically. Postgonite short, with pile only on baso-ventral ½ although pile sockets are visible on apical ½, dorsal and ventral surface almost straight; postgonite apex convex apically, with small acute dorsal extremity and convex ventral extremity.

Female: Female unknown.

Length. 12mm; wing 10mm.

Distribution. Costa Rica (Puntarenas).

Primary type. Holotype: Male in good condition with left proleg and genitalia dissected and placed in individual plastic tubes pinned with the specimen. Holotype labels: ‘ COSTA RICA, Prov. Puntarenas, // Camino a las Tablas, horilla de un // charral. 1200m. 28 JUN 1998. E. // Navarro. L_S_318300_594400 #50799’ ‘INB0003045918 INBIOCRI COSTA RICA’ ‘ Holotype // Pelecinobaccha // unica // Miranda’ [red label].

Comments. This species is similar to P. telescopica , but the sub-scutellar fringe has much longer pile, the 1st abdominal segment is entirely white pilose, and the surstylus and postgonite are distinctive.

Etymology. The specific epithet refers to the unique characteristics of the type specimen when compared to P. telescopica . It is to be treated as an adjective.

Figures

FIGURE 41. a – e. Pelecinobaccha unica sp. nov., holotype: a – d. Male genitalia: a. Epandrium, lateral. b. Epandrium, ventral. c. Hypandrium, lateral. d. Hypandrium, ventral. e. Habitus, dorsal. f – j. Pelecinobaccha wyatti sp. nov., holotype: f – i. Male genitalia: f. Epandrium, lateral. g. Epandrium, ventral. h. Hypandrium, lateral. i. Hypandrium, ventral. j. Habitus, dorsal. s scl: subepandrial sclerite.