Pelecinobaccha susio Hull 1941, comb. nov.
Creators: name: Miranda, Gil Felipe Gonçalves
name: Marshall, Stephen A.
name: Skevington, Jeffrey H.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Pelecinobaccha
Pelecinobaccha susio

description: Pelecinobaccha susio (Hull, 1941) comb. nov.
Map 4. Figure 2.
Baccha susio Hull, 1941.— Hull, 1941: 61. Type locality: Brazil, São Paulo, Avanhandava. Holotype female CNC. Hull, 1949a: 171 (redescription), 221 (fig. 138, abdomen).
Ocyptamus susio. Thompson et al., 1976: 28 (catalog citation).
Baccha ada Curran, 1941.— Curran, 1941: 278. Type locality: Brazil, Santa Catarina, Nova Teutônia. Holotype male AMNH. Hull, 1949a: 135 (redescription), 195 (fig. 20, female abdomen), 217 (fig. 116, male abdomen). n. syn.
Ocyptamus ada. Thompson et al., 1976: 12 (catalog citation).
Male. Head: Brown. Face pale on lateral ¼; gena light brown. Lunule distinctly pale above antennal insertion, central macula connected to frontal triangle color by a weak light brown median vitta. Frontal triangle pale laterally until eye contiguity, with golden pollen homogenously distributed with a small dorso-lateral region visible only from a dorso-posterior view, white pollen restricted laterally and continuous from face with a small dorsal patch of differently oriented pollen; only frontal prominence protuberant. Vertical triangle with most of its pile restricted to a single row; ocellar triangle separated by its length from posterior eye margin. Eye contiguity as long as vertical triangle length. Eye with sub-triangular indentation on posterior margin positioned slightly dorsal to antennal insertion. Antennal insertions confluent, ventral sclerotized margin slightly extended dorsally; antenna brown. Occiput homogenously covered with white pollen, dorsal ¼ with 2 rows of simple black pile, anterior row shorter, ventral ¾ with 2–3 rows of white, scale-like pile, anterior rows slightly shorter.
Thorax: Scutum dark brown, sometimes pale laterally, with a dull golden pollinose sub-median pair of vittae tapering posteriorly but not reaching scutellum, and a median (usually complete) narrow golden-pollinose vita; scutum mostly black pilose except white on notopleuron and laterally between transverse suture and post-alar callus, and pile longer on notopleuron; scutum anterior row of shining white pile with shorter pile in the middle. Scutellum light brown with a darker median fascia, pile black; subscutellar fringe pile normal, black medially and white laterally. Pleuron dark brown, slightly lightened on posterior anepisternum, dorso-posterior portion of katepisternum and katatergite; pleuron mostly white pilose except black on dorso-medial and posterior anepimeron. Plumula white. Calypter golden, fringe sometimes darker. Halter light brown, capitulum yellow to orange.
Wing: Mostly hyaline, dark on c, basal ½ of r cell, and stigma, entirely microtrichose; alula hyaline, basally 2 times and apically 3 times as broad as c cell, entirely microtrichose.
Legs: Proleg light brown, profemur darker, basal ½ and apex of protibia pale. Mesoleg light brown, mesofemur darker, mesotibia mostly pale except for a slight darkening subapically, ventral setae on apex of mesotibia and mesotarsus light golden; metaleg dark brown, pale on apex of metafemur, base of metatibia and apical ⅔ to ¾ of metabasitarsomere to 4th metatarsomere.
Abdomen: Dark brown, 3.6 times as long as thorax; 1st tergite light brown, palest laterally, mostly black pilose but pile longer and white baso-laterally. Second tergite long, ~4.3 times minimum width, baso-lateral ⅓ pale to indistinct from the rest of the tergite; 2nd tergite with subapical central triangular region of dull black pollen, and with appressed and black pile. Third tergite trapezoidal and long, 2.6 times minimum width, with baso-lateral pale triangular maculae and central pair of pale short vittae; 3rd tergite with large central triangular region of dull black pollen, and with short, appressed and black pile. Fourth tergite sub-quadrate, slightly longer than wide, central spots longer, remaining characteristics as on 3rd. Fifth tergite rectangular and wide, with central vittae that may connect to baso-lateral triangles; remaining characteristics as in 3rd. Genitalia: Cercus with 1 regular row of pile on medial margin and 2 regular rows on lateral margin. Surstylus directed apicoventrally, short, with rounded apex, with weak setulae (around 8) on apicoventral margin, pilose on dorsal surface. Subepandrial sclerite quadrate, with shallow concavity medially on apical margin. Hypandrium with ventral notch quadrate and extending to anterior ½. Distiphallus with anterior surface curved anteriorly on apex. Phallapodeme well sclerotized and slightly enlarged on base. Postgonite with pile mainly on ventral surface, ventral surface straight, dorsal surface slightly concave with small convexity before apex; postgonite apex slightly convex anteriorly, with small rounded ventral extremity and acute dorsal extremity.
Female: Similar to male except: frons pale laterally almost until ocellar triangle, with golden pollen oriented differently only in front of ocellar triangle and white lateral pollen with no patch of differently oriented pollen; ocellar triangle 3 times its length from posterior eye margin and ~2.5 ocelli-width from lateral eye margin; dorsal occipital pile may fade to a pale yellow. Scutum pale laterally, sometimes with a few black pile anterior to transverse suture on notopleura; subscutellar fringe pile very short and black to inconspicuous. Second abdominal tergite shorter than on male, 2.6 times minimum width, with smaller dull pollinose region, and lateral pile much shorter than on male. Third tergite shorter than on male. Fourth tergite rectangular and wide. Sixth segment conical, divided into separate tergite and sternite inconspicuously on most of its extension but distinctly fused at apex, 1.1 times minimum width and 1.4 times as long as 5th. Genitalia: 7th tergite triangular, with basal apodeme extending for ⅔ of the length of the 6th segment, 7th segment lateral sclerite triangular; 8th tergite unsclerotized medially appearing as a pair of separate sclerites, basal crest weakly sclerotized and uniform, without extended ridges. Cercus with 1 row of pile on apical margin.
Length. 8.5–14.5mm; wing 8.0– 10.5mm.
Distribution. Brazil (Mato Grosso, Paraná, Santa Catarina, São Paulo).
Material examined. BRAZIL. Mato Grosso, Maracaju, Frank M. Hull Collection C.N.C. 1973, May 1937, Serviço Febre Amarela M. E. S. Bras. (1 ♀, CNC Diptera 161392); Paraná, Iguassú, Dec 1941, Com. E. N. V. (1 ♀, CNC Diptera 161393); São Paulo, S. Avanhanda[v]a, Holotype susio access [red label], Holotype Baccha susio Hull CNC No 20528 [red label], 28 Apr 1908 (1 ♀, holotype Baccha susio, CNC Diptera 203526); Santa Catarina, Nova Teutônia, 27°11'S 52°23'W, 15 & 24 Oct 1939, F. Plaumann (2 ♀, paratypes Baccha ada, CNC Diptera 161385 & AMNH); ..., 22 Oct 1939, F. Plaumann (1 ♂, paratype Baccha ada, CNC Diptera 161384); ..., 500m, Frank M. Hull Collection C.N.C. 1973, Mar 1948 (4 ♂, CNC Diptera 161386–8, 161391); ..., 300–500m, Nov– Feb 1952, 1966, 1968–9 (2 ♂, CNC Diptera 161389–90, 8 ♀, CNC Diptera 161394, 161396–401 & AMNH).
Comments. Hull (1949a) stated that Baccha susio differed from B. ada: “in the distinctly shorter 4th and 5th abdominal segments (of female) and the absence of coppery or purplish reflection along the sides of the mesonotum”. He furthermore pointed out that “in ada the vittae of the 4th segment tend to be disconnected from the basal fascia and the lower occipital cilia are distinctly less flattened and coarse.” The length of the abdominal segments varies slightly among specimens of both species, mainly due to artefacts of preservation. The “coppery reflection”, a mixture of background shine plus sparse pollinosity, is slightly visible on the B. susio holotype, although difficult to assess due to the poor state of the specimen. It is common for the abdominal vittae to vary among specimens from the same series. Finally, there is no difference between the occipital pile of the type specimens. B. ada is hereby considered a junior synonym of B. susio following the principle of priority (Article 23 of the ICZN), since B. ada was described in August, 1941 and B. susio in April, 1941.
description: Published as part of 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), pp. 1-154 in Zootaxa 3819 (1) on pages 72-73, DOI: 10.11646/zootaxa.3819.1.1, http://zenodo.org/record/251284