Perithreticus neglectus Kvifte, 2022

Kvifte, Gunnar Mikalsen, 2022, Description of Perithreticus neglectus sp. n. from the West Usambara Mountains, Tanzania (Diptera, Psychodidae), Biodiversity Data Journal 10, pp. 81205-81205 : 81205

Perithreticus neglectus Kvifte, 2022 sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: B-10800. ; Taxon: scientificName: Perithreticus neglectus Kvifte, 2022; order: Diptera; family: Psychodidae; genus: Perithreticus; specificEpithet: neglectus; Location: continent: Africa; country: Tanzania; stateProvince: Tanga; locality: Mazumbai forest reserve ; verbatimLocality: Tanzania: Tanga Region, W. Usambara Mts. , Mazumbai, Loc. B; decimalLatitude: -4.800; decimalLongitude: 38.500; geodeticDatum: WGS8; Identification: identifiedBy: Kvifte, Gunnar Mikalsen; Event: samplingProtocol: Malaise trap; year: 1990; month: 11; day: 3; verbatimEventDate: 03/11/1990; fieldNumber: B; Record Level: institutionCode: ZMUB

Description

Adult male (n=1). Head (Fig. 1 A) longer than wide; vertex about a fifth of total head length; eye bridge of four facet rows, separated by 0.5 facet diameters; with single row of 8-9 postocular setae; interocular area slightly broader anteriorly; interocular suture triangular; frontal patch of setae alveoli crown-shaped with median posterior extension reaching anteriormost row of eye bridge; length of first palp segment 67.5, other palpomeres not preserved; labellum bulbous and setose; only single antenna with three flagellomeres preserved in specimen (Fig. 1 B), scape stoutly barrell-shaped, of equal width; pedicel stout spheroid, wider than long; flagellomeres 1-3 symmetrical nodiform with paired ascoid insertions, ascoids lost; length of scape, pedicel and first three flagellomeres 70, 62.5, 130, 125, 125; Thorax with anepisternum with trapezoid hair patch, anterior spiracle with prolonged U-shaped posterior suture delimiting it from anepisternal hair patch; anepimeron triangular with sinusoid lower margin, ventral suture of anepimeron reaching about halfway into sclerite; posterior spiracle with operculum evenly setose; mid-coxa with anteromesal field of setae; Wing (Fig. 1 C) elipsoid, 2.25 mm long, 0.75 mm wide; membrane only with micropilosity; area between C and R1 infuscate; hyaline field below R1 reaching level of medial fork; radial fork clearly distad of medial fork and around same level as CuA; outlines of R5 and M4 more strongly sclerotised than other veins; origin of R5 with dark spot; jugum broadly angular U-shaped.

Terminalia (Fig. 1 D, E) symmetrical, hypandrium with only anterior and posterior margin sclerotised, glabrous or membranous medially; gonocoxites reniform with parabasal process broadly triangular, meeting medially; single band of setae present, covering medial 5th, gonocoxal condyles with triangular plate laterally and narrow strip-like plate medially; gonostyli bluntly acuminate, covered in spiniform sensilla, with subapical trichiform sensilla nearly the length of broad gonostylar base; aedeagus with basiphallus short, about a third of length of distiphallus, divided into two phallomeres that fuse after a drop-shaped basal aperture, forming long parallel-sided rod-like distiphallus; parameres elongate curved subtriangular with lateral margins concave and mesal margins convex, blunt apically, basally with small pointed lateral processes; aedeagus reaching further than parameres; epandrium (Fig. 1 E) wider than long; anteroventral surface covered in hairs; subepandrial sclerite only discernible as submedian keel in specimen; surstylus cylindrical, apparently curved, apically with 6-7 tenacula in single transverse row; hypoproct mostly naked, but with distal margin finely pilose, M-shaped; epiproct subrectangular with rounded corners; proctiger laterally with small sclerites (vestigial cerci?) pointing towards surstyli.

Diagnosis

Can be recognised by the following combination of characters: radial fork distad of medial fork, hypandrium with large unsclerotised area medially, aedeagus parallel-sided with triangular parameres shorter than aedeagus, parameres with triangular basolateral expansions poorly developed, surstylus with 6 tenacula, gonostyle with subapical trichiform sensilla (see also key in Kvifte et al. 2016).

Etymology

From Latin Perithreticus neglectus , "overlooked", "neglected", referring to the specimen not being included in the initial revision of Afrotropical Psychodini by Kvifte (2015).

Distribution

Only known from the type locality in the Mazumbai Forest Reserve, West Usambara Mountains, Tanzania.

Figures

Figure 1. Morphological illustrations of Perithreticus neglectus sp. n. A head; B antenna; C wing; D gonopods, aedeagus and parameres; E epandrium and proctiger. Scale bars: 100 µm (A, B, D, E), 500 µm (C).