Neodexiopsis plana, Couri & Gomes & Carvalho, 2023

Couri, Márcia Souto, Gomes, Lucas Roberto Pereira & Carvalho, Claudio José Barros de, 2023, Neodexiopsis Malloch (Diptera, Muscidae) from Ecuador: description of new species and a key to the species, Revista Brasileira de Entomologia (e 20230017) 67 (3), pp. 1-9 : 6-7

Neodexiopsis plana new species urn:lsid:zoobank.org:act:903A99A3-F4FC-48C1-926C-F9ADDE3460EC

( Figs 4A–G , 6D )

Diagnosis: The female abdomen of Neodexiopsis plana new species is dorsoventrally flattened, an unusual characteristic in other species of the genus.

Description: Male. Length: body: 3.5 mm; wing: 3.7 mm.

Color: General brown, with grey pollinosity. Frons brown with gray pollinosity around the ocellar triangle and along the middle line of the eyes. Face, parafacial, fronto-orbital plate, and gena gray pollinose. Antennae and arista dark brown. Palpus brown. Calypteres uniformly whitish; halter yellow. Wing smoky. Mesonotum brown, postpronotum, and pleurae gray pollinoses. Coxae grey pollinose; trochanter yellow; fore femur brown with extreme apex yellow, mid and hind femora with basal half or third yellow; tibiae yellowish brown and tarsi brown. Abdomen brown, a little shiny in males, and with grey pollinosity laterally in females.

Head: Eyes bare; inner and outer vertical setae long. Frontal row with four pairs of setae, third row long, upper backward directed. Ocellar setae fine, long, forward-directed, and divergent from one another. Lunule slightly projected in males. Antennae inserted slightly above mid-level eyes. Postpedicel approximately 3.8 times the length of the pedicel in males. Arista, very short pubescent. Vibrissa long.

Thorax: Acrostichal hairs very fine, pair pre-scutellar not developed. Presuturals one; supra-alar one; post supra-alar one. Scutellum with a very long pair of basal setae and a very short and fine apical one. Anepisternum with ground setulae and four long setae, inferior one longer. Fore femur with anterodorsal and anteroventral complete rows of setae. Fore tibia on posterior surface with a long median seta; dorsal and ventral surfaces with an apical seta. Mid femur with 1–2 anterior setae; ventral surface with about six fine-spaced setae; posterior surface with two preapical setae. Mid tibia with one median anterodorsal and one median posterodorsal setae; one dorsal preapical, one ventral and one dorsal apical. Hind femur with about 5–6 anterodorsal spaced setae and two anteroventrals on apical third. Hind tibia with one anterodorsal and one posterodorsal median seta, long dorsal on apical third, one dorsal preapical and one ventral apical. Wing long.

Abdomen: Tergites 1 + 2 – 4 with one lateral pair of setae; tergite 5 with a series of setae on disc and apex. Sternite 5 ( Fig. 4A ) trapezoid with many apical setae. Sternite 7 and syntergosternite 7 + 8, as in Fig.4D .

Terminalia : Cercus is longer than wide and not extending beyond the surstylus apex ( Figs 4B–C ). Surstylus long and enlarged ( Figs 4B–C ). Hypandrium tubular and long; phallapodeme with the same diameter in all extensions ( Fig. 4C ). Pregonite and postgonite of similar length ( Fig. 4C ).

Female: Similar to male, except for the postpedicel shorter, approximately 3.0 times the length of the pedicel, median posterodorsal seta absent on hind tibia. Ovipositor long with tergites narrow, epiproct and cerci long, with long seta on external margins ( Fig. 4E ); sternites narrow and two spermathecae rounded ( Figs 4F–G ).

Material examined: Holotype male: ECUADOR: 13074. ( EC) Loja: Cajanuma, Podocarpus National Park, trail Oso de anteojos, 3000m, 16/02/2009 - 20/02/2009 ( YPT), leg. Marc Pollet & Anja De Braekeleer , sorted by Marc Pollet – sample code EC/2009-31/ MP & ADB-012 ( UTPL).

Paratypes: Same label as holotype, sample code EC/2009-34/ MP & ADB- 012, 2♀♀ ( UTPL) , 2♂♂ ( MNRJ) , 2♀♀ ( DZUP); 13106, Trail Los Miradores, EC/2009-34/ MP & ADB- 003, 1♀ ( UTPL) , 1♀ ( RBINS) , 1♀ ( DZUP); 13065, Trail Los Miradores, 16/02/2009 - 20/02/2009, EC/2009- 31/ MP & ADB- 00, 1♀ ( UTPL); 13147, Trail Los Miradores, 27/02/2009 - 05/03/2009, EC/2009-37/ MP & ADB- 003, 2♀♀ ( DZUP); 13170, Trail Bosque Nublado, 16/02/2009 - 05/03/2009, EC/2009-37/ MP & ADB- 013, 1♀ ( RBINS) , 2♀♀ ( MNRJ) .

Etymology: The specific name is derived from the Latin word plana and refers to the flat dorsal aspect of the abdomen.

Figures

Figure 4 Neodexiopsis plana new species: A. Sternite 5, dorsal view; B. Cercal plate and surstylus, dorsal view; C.Cercal plate and surstylus and phallic complex, lateral view; D. Sternite 7 and syntergosternite 7 + 8, dorsal view; E.Ovipositor, dorsal view; F.Ovipositor, ventral view; G. Spermathecae.Scale:0.1 mm.

Figure 6 Neodexiopsis, habitus lateral view:A.N. bicoloratta new species, male paratype;B.N. longialata new species, female paratype;C.N. nigrocalyptrata new species, female paratype; D. N. plana new species, female paratype; E. N. secunda new species, male holotype.Scale:1.0 mm.