Neodexiopsis secunda, 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 : 7-8

Neodexiopsis secunda new species urn:lsid:zoobank.org:act:31C145EC-3A8B-4874-A82C-3467AF54DBA5

( Figs 5A–E , 6E )

Diagnosis: The new species belongs to the ovata group. In Snyder’s (1958) key to this group, this species approaches N. willistoni because of the length of the apical scutellar setae but differs in many other characters. The species is easily distinguished from the other Neodexiopsis recorded in Ecuador by a long median seta on the posterior surface of the hind tibia. This species is known only by its holotype.

Description: Male. Length: body: 3.2 mm; wing: 3.4 mm.

Color: General brown, with grey pollinosity.Frons brown and light brown along the midline. Face, parafacial, fronto-orbital plate, and gena gray pollinose. Antenna and arista dark brown, the apex of the pedicel lighter with gray pollinosity. Palpus yellowish on basal twothirds and brown on apical third. Calypteres uniformly whitish; halter yellow. Wing clear. Mesonotum brown-grey pollinose with five faint stripes. Legs yellow, the apex of femora brown on dorsal surface; tarsi brown. Abdomen brown, lateral areas of tergites 1 + 2 and 3 yellow; terminalia yellow.

Head: Eyes bare; inner vertical setae longer than outer setae. Frontal row with four pairs of setae, third row long, upper backward directed. Ocellar setae fine. Antennae inserted slightly above mid-level eyes. Postpedicel about 2.8 times the length of the pedicel. Arista, very short pubescent.

Thorax: Acrostichals very fine.Presutural 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. The two posterior katepisternals very long. Lower calypter long, about 2.8 times the length of the superior and broad. Fore femur with anterodorsal and anteroventral complete rows of spaced setae. Fore tibia on the posterior surface with a long median seta; one short preapical dorsal and posterodorsal; ventral surface with an apical seta. Mid femur with one fine anterior setae on apical fourth; ventral surface with three fine-spaced setae; posterior surface with two preapical setae. Mid tibia with one median anterodorsal submedian and one median posterodorsal setae, one anterior and one ventral apical setae, the last one very strong. Hind femur with about five anterodorsal spaced setae and two anteroventral on apical third. Hind tibia with one anterodorsal and one posterodorsal median seta, long dorsal on apical third, dorsal preapical, and ventral apical. Wing with the basal lobe ( Fig. 5E ).

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. 5A ) rounded with many apical setae.Sternite 7 and syntergosternite 7 + 8, as inFig.5D.

Terminalia : Cercus is longer than wide, shorter than the length of the surstylus ( Figs 5B–C ). Surstylus long and very enlarged apically ( Figs 5B–C ). Hypandrium tubular and long; phallapodeme with the same diameter in all extensions ( Fig. 5C ). Pregonite and postgonite of similar lengths ( Fig. 5C ).

Female: unknown.

Material examined: Holotype male: ECUADOR: 13147. ( EC) Loja: Cajanuma Podocarpus National Park, Trail Los Miradores, 3000m, 20/02/2009 - 05/03/2009 ( YPT). Leg. Marc Pollet & Anja De Braekeleer , sorted by Marc Pollet – sample code EC/2009-34/ MP & ADB-003 ( UTPL).

Etymology: The name refers to the second species of the ovata group recorded in Ecuador.

Geographical distribution

Neodexiopsis species occurring in the Ecuadorian highland sites are mostly endemic, as only N.latifrons andN. equator occur in other regions ( Fig. 7 ). In the same sites as the new species described here, many other endemic Muscidae species are present, some of them occurring also up to 3000 meters ( Fogaça and de Carvalho, 2015; de Carvalho et al., 2019). We updated the distribution of N. devia , the records from Trinidad and Tobago and the United States of America presented by Löwenberg-Neto & de Carvalho (2013) are mistaken. Based on this, we updated the distribution of N. devia as being endemic to Isla de San Cristóbal and Isla Santiago (Galapagos Islands), as previously presented by Curran (1934).

Figures

Figure 5 Neodexiopsis secunda 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.Wing. 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.

Figure 7 Geographical distribution of Neodexiopsis species in Ecuador.N.bicoloratta new species (red circle);N.devia (red diamond);N.latifrons (yellow diamond); N.rufitibia (black circle). Orange circle= N. equator and N. rufitibia. Blue circle= N. longialata new species and N. nigrocalyptrata new species. Yellow circle= N. longialata new species, N. nigrocalyptrata new species, N. plana new species, N.secunda new species.