Retrocitomyia sisbiota , Mello-Patiu, Cátia Antunes De & Salazar-Souza, Mônica, 2016

Mello-Patiu, Cátia Antunes De & Salazar-Souza, Mônica, 2016, Retrocitomyia Lopes, 1982 (Diptera: Sarcophagidae): new species, new records, key to males, and an updated catalog, Zootaxa 4171 (3), pp. 534-548: 535-539

publication ID

http://doi.org/10.11646/zootaxa.4171.3.8

publication LSID

lsid:zoobank.org:pub:C101431B-233D-44EB-9F8F-D23C171AD50D

persistent identifier

http://treatment.plazi.org/id/D94EEB26-FF84-FF98-FF2D-88667BCBF864

treatment provided by

Plazi

scientific name

Retrocitomyia sisbiota
status

sp. nov.

Retrocitomyia sisbiota  sp. nov.

( Figs 1–9View FIGURES 1 – 3View FIGURES 4 – 9, 14View FIGURES 14 – 19)

Diagnosis. Male cercus, in posterior view, with cercal prong curved and falciform, and a cluster of short setae from the middle of the cercal base to the base of the cercal prong; phallus with vesica consisting of two, ventrally joined lobes with apical margin curved laterally, and phallus with juxta longer than wide, with a straight apical margin (posterior view) and swollen lateral margins (in lateral view). Female ST8 large, not fused to ST7, with two depressed, rounded lateral areas separated by a longitudinal, central, less sclerotized strip.

Description. Male (n = 74). Length: 7–10 mm.

Head. Parafacial, fronto-orbital plate and posterior ocular orbits with intense golden pruinosity; fronto-orbital plate with a row of setulae from the upper region to the gena; face with light silver pruinosity and parafacial dark gray ( Fig. 1View FIGURES 1 – 3); frons about 0.26x head width at level of ocellar triangle; frontal vitta blackish along its whole length; 6 well-developed frontal setae reaching level of apex of pedicel; reclinate orbital seta present and more developed than the largest frontals, proclinate orbital setae absent; ocellar setae as developed as the upper frontals, postocellar seta similar to outer vertical seta; inner vertical seta the largest of the vertex, outer vertical seta undifferentiated from postocular setae; gena and genal groove with intense golden pruinosity, gena with black upper setae and pale lower setae; postgena gray with silvery pruinosity and pale setae; occiput gray with an upper row of black setulae and the remaining setulae pale; antenna with pedicel dark gray and postpedicel blackish, with light gray pruinosity; arista long plumose on basal 2/3; palpus black.

Thorax. Gray with silvery pruinosity and three dark brown longitudinal bands. Chaetotaxy: acrostichals 0+1, dorsocentrals 3 (the posteriormost stronger) + 2 (inserted in posterior half of distance from suture to scutellum), intra-alars 1+2, supra-alars 1+3, postpronotals 3; postalar wall setulose; scutellum with 2 marginal setae, a pair of preapical setae and a pair of long and crossed apical setae; postalar callus with 2 setae; katepisternal setae 3, almost in a straight line; merals 6–8; proepisternum bare, prosternum setulose in posterior half. Wing: hyaline, costal spine present, vein R4+5 with dorsal setulae on 3/4 of distance to crossvein r-m, vein R1 bare, cell r4+5 open at wing margin, third costal sector ventrally bare. Legs: blackish-brown; fore tibia with 2 median-basal anterodorsal setae, 1 median and 1 preapical posterior setae, and 1 preapical dorsal seta; mid femur with 2 strong median anterior setae, a row of 4 setae on anteroventral margin, 2 apical posterior setae, and a row of setae along posteroventral margin (but without a ctenidium); mid tibia with 2 median anterior setae, 1 median ventral seta, 1 basal posterior seta and 2 posterior setae in the apical third; hind trochanter with normal median-ventral setae; hind femur with rows of dorsal, anterodorsal, anteroventral and posteroventral setae, and 1 longer preapical anteroventral seta; hind tibia with 1 median and 1 apical anterior setae, 1 basal, 2 median and 1 apical setae on the anterodorsal and posterodorsal surfaces, and 1 preapical ventral seta.

Abdomen. Brown with pattern of silvery-gray pruinosity ( Fig. 1View FIGURES 1 – 3); syntergite 1+2, T3 and T4 each with one lateral marginal seta, T4 with one pair of stronger median marginal setae, T5 with about 18 marginal setae; ST5 with short lobes, apically expanded and truncated ( Figs 1–2View FIGURES 1 – 3).

Terminalia. Syntergosternite 7+8 and epandrium brown with pale golden pruinosity on almost the entire dorsal surface except for a glabrous anterior band ( Figs 1–2View FIGURES 1 – 3; cercus, pregonite, postgonite, and phallus blackish-brown; syntergosternite 7+8 with 6 long and strong marginal setae ( Figs 2View FIGURES 1 – 3, 5View FIGURES 4 – 9); cercus enlarged and flattened, with a depression and numerous setae along its inner margin in basal half (posterior view), cercal prong curved and falciform (posterior view), with some short setae ( Figs 2View FIGURES 1 – 3, 5–6View FIGURES 4 – 9, 14View FIGURES 14 – 19); surstylus narrow and elongated, with several long setae in apical half and a membranous lateral projection ( Fig. 5View FIGURES 4 – 9); postgonite short, with a conspicuously laterally curved and pointed apex, and a dilated region near the apex with a small ventral seta ( Fig. 14View FIGURES 14 – 19); pregonite long and setulose on its dorsal surface, with a curved apex; phallus short, compact and dark blackish-brown ( Fig. 2View FIGURES 1 – 3), basiphallus short ( Fig. 7View FIGURES 4 – 9); vesica well sclerotized, formed of two ventrally-joined lobes with apical margin curved laterally ( Figs 2View FIGURES 1 – 3, 7–8View FIGURES 4 – 9); juxta well sclerotized, with a straight apical margin (posterior view) and swollen lateral margins (lateral view) ( Figs 2View FIGURES 1 – 3, 7–8View FIGURES 4 – 9).

Female (n = 17). Length: 7–8 mm. Differs from male as follows:

Head. Frons about 0.34x head width at level of ocellar triangle; 5–6 well-developed frontal setae; 2 proclinate orbital setae similar to or slightly longer than reclinate orbitals; outer vertical seta about 2/3 to 1/2 of length of inner vertical seta. Thorax. Scutellum with 2 long marginal setae, a pair of small preapical setae and no apical setae. Abdomen. T5 with posterior margin yellowish-brown, and with 7–8 pairs of premarginal setae besides the large number of smaller marginal setae ( Fig. 3View FIGURES 1 – 3); T6 as 2 narrow bare plates, almost attached by an extremely narrow membranous dorsal join; spiracles 6 and 7 located in the intersegmental membrane ( Fig. 9View FIGURES 4 – 9). Epiproct undivided and ventrally projected, with 2–3 pairs of well-developed setae ( Fig. 9View FIGURES 4 – 9); hypoproct broad. ST4 and ST5 each with a pair of large setae on posterior margin, and both slightly oval and narrower than ST6. ST6 and ST7 united, but with a well-defined delimitation between them and both with their posterior margin medially concave and with a cluster of setae on their lateral margins ( Fig. 9View FIGURES 4 – 9). ST8 wide and not fused to ST7, with two depressed, rounded lateral areas separated by a longitudinal, central, less sclerotized strip, where 1–2 pairs of well-developed distal setae are inserted ( Fig. 9View FIGURES 4 – 9); posterior margin slightly V-shaped; lateral areas and posterior margin conspicuously covered with golden pubescence ( Figs 3View FIGURES 1 – 3, 9View FIGURES 4 – 9). Vaginal plate dark and glabrous, very sclerotized, as wide and as long as ST8, with a triangular sclerotized signum at its proximal end ( Figs 3View FIGURES 1 – 3, 9View FIGURES 4 – 9).

Type-material. Holotype ♂: “ BRAZIL, MS [Mato Grosso do Sul], Corumbá / Passo do Lontra—B.E.P [Base de Estudos do Pantanal / UFMS] / 19º34’20.9”S 57º00’58.0”W / Shannon [trap] (peixe) [= fish] / 06.xii.2011 / Patiu & Patiu col. [leg.] [printed on white paper] / Sisbiota  / CNPq/FAPESP [vertical]” // “ Holotype [printed on red paper, black frame]” // “ Retrocitomyia  / sisbiota Mello-Patiu  / & Salazar-Souza, 2016 [handwritten on white paper] / Det. C.A. Mello-Patiu [printed]” ( MNRJAbout MNRJ)GoogleMaps  . Paratypes (73 ♂ and 17 ♀ in total): same data as holotype, 46 ♂, 6 ♀ (37 MNRJAbout MNRJ, 15 MZUSPAbout MZUSP)GoogleMaps  ; same data as holotype except 07. xii.2011, 4 ♂, 5 ♀ (4 MNRJAbout MNRJ, 5 MZUSPAbout MZUSP)GoogleMaps  ; same data as holotype except hand net, Lamas, Nihei & equipe leg., 9 ♂, 1 ♀ ( MZUSPAbout MZUSP)GoogleMaps  ; same data as previous except 07. xii.2011, 5 ♂, 4 ♀ (7 MNRJAbout MNRJ, 2 MZUSPAbout MZUSP)GoogleMaps  ; same data as previous except yellow pan trap, 06. xii.2011, 2 ♂ ( MZUSPAbout MZUSP)GoogleMaps  ; same data as previous except 07. xii.2011, 3 ♂ ( MZUSPAbout MZUSP)GoogleMaps  ; same data as previous except Malaise trap, 02–17. xii.2011, 1 ♂, 1 ♀ ( MNRJAbout MNRJ)GoogleMaps  ; same data as previous except 16–31. i.2012, 1 ♂ ( MNRJAbout MNRJ)GoogleMaps  ; same data as previous except 02–17. xi.2012, 1 ♂ ( MNRJAbout MNRJ)GoogleMaps  ; same data as previous except modified van Sommeren trap, 07. xii.2012, 1 ♂ ( MZUSPAbout MZUSP)GoogleMaps  .

Etymology. The species epithet, sisbiota  , is a noun in apposition derived from the name of the project that allowed us to collect this species.

Remarks. The Sisbiota  Diptera project  included many collection sites in a number of habitats; however, the new species was collected exclusively in one, annually flooded locality in the south Pantanal in the state of MS, suggesting that it is possibly endemic. It was attracted by several means: by using rotten fish as bait in Shannon and modified van Sommeren traps, or with hand nets, Malaise traps, and yellow pan traps.

A comparative analysis among species of Retrocitomyia  with a short and wide cercus revealed that the male terminalia of R. sisbiota  are morphologically very similar to those of R. paraguayensis  and R. mexicana  for the presence of a median constriction along the outer margin of the cercus (posterior view). The three species can be differentiated by the following features of the cercus: a setose elevation near the inner margin in R. mexicana  ( Fig. 23View FIGURES 20 – 24), a band of clustered short setae in a depressed median area in R. sisbiota  ( Fig. 14View FIGURES 14 – 19), and a cluster of hair-like setae at the base of the cercal prong in R. paraguayensis  ( Fig. 17View FIGURES 14 – 19).

A comparison between females of R. sisbiota  and R. retrocita  showed that they share a similar epiproct in the shape of a tongue-like setose plate ventrally projected together with the cerci, a well-sclerotized vaginal plate, and a sclerotized signum (in which the spermathecal ducts are inserted). Females of these two species can be differentiated mainly by T6 wide and setose and ST8 longer than wide with lateral round depressions in R. retrocita  , and T6 narrow and bare and ST8 wider than long with a longitudinal central unsclerotized strip between the lateral areas in R. sisbiota  .

MNRJ

Museu Nacional/Universidade Federal de Rio de Janeiro

MZUSP

Museu de Zoologia da Universidade de Sao Paulo