Dixella hernandezi Chaverri and Borkent

Chaverri, Luis Guillermo & Borkent, Art, 2007, The Meniscus midges of Costa Rica (Diptera: Dixidae), Zootaxa 1575 (1), pp. 1-34: 10-11

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http://doi.org/ 10.11646/zootaxa.1575.1.1

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Dixella hernandezi Chaverri and Borkent

n. sp.

Dixella hernandezi Chaverri and Borkent   n. sp.

( Figures 1B View FIGURE 1 , 2B View FIGURE 2 , 4B View FIGURE 4 , 6B View FIGURE 6 , 7B View FIGURE 7 , 10B View FIGURE 10 , 18A View FIGURE 18 )

Diagnosis. Male: only species of Dixidae   in Central America with uniformly dark pleura ( Fig. 4B View FIGURE 4 ), with the lateral vitta, at most, connecting narrowly anteriorly with the medial vitta ( Figs. 2B View FIGURE 2 , 4B View FIGURE 4 ), and R2+3 originating basal to r-m ( Fig. 6B View FIGURE 6 ). Female: unknown.

Description. Male. Head ( Fig. 1B View FIGURE 1 ): brown, with dense spicules in irregular patches. Clypeus brown, as wide as long. Antennal scape yellowish, pedicel dark brown; flagellomeres yellowish. Thorax ( Fig. 2B View FIGURE 2 , 4B View FIGURE 4 ): scutum with one brown medial vitta extending from anterior margin to middle of scutum, broad anteriorly, narrow posteriorly; lateral brown vitta from supraalar area to prescutum, lateral margin notched above spiracular area, not joining medial vitta anteriorly; minute spicules along medial margin of lateral spot. Scutellum, mediotergite brown. Pleura with pronotum yellowish, propleuron, katepisternum, posterior anepisternum, ventral half of anepimeron, metanepisternum brown; dorsal half of anepimeron yellowish. Wing ( Fig. 6B View FIGURE 6 ; Table 1): without dark spot over r-m; R2+3 originating basal to r-m; stem of R2+3 0.50 length of R3. Halter: pale, 0.30 length of fore femur. Legs: coxae, trochanters yellowish; femora yellowish with brown apices; tibiae uniformly pale brown; claws as figured ( Fig. 7B View FIGURE 7 ). Genitalia ( Fig. 10B View FIGURE 10 ): tergite 9 with anterior, posterior margins concave, with scattered setae. Sternite 9 with posterior margin with broad excavation, with 6 lateral setae in row. Gonocoxite as long as wide, with well developed posterolateral sharp projection; basal lobe not visible; apical lobe slightly longer than gonostylus, stem with midlength and subapical seta, some short subapical spicules, apex expanded, apically slightly bilobed with setae as figured. Gonostylus with scattered setae in apical fourth, two apical elongate setae. Parameres dark brown, directed anteriorly. Aedeagus as figured. Tergite 10 with various, poorly defined lobes.

Female and larva. Unknown.

Pupa. Not described.

Distribution and bionomics. This species is known only from the type locality in Costa Rica ( Fig. 18A View FIGURE 18 ). Pupae were found in a seepage pool with muddy substrate in a pasture and in full sun at 1224 m, in the life zone corresponding to Premontane Very Wet Forest.

Types: Holotype, male adult on microscope slide with pupal exuviae, labeled “ HOLOTYPE Dixella hernandezi Chaverri and Borkent   ”, “ Costa Rica, Prov. Cartago, Paraíso, ACLA-P, Parque Nacional Tapantí- Macizo de la Muerte , orilla puente del río Grande de Orosí , 1224 m, 27-IV-2001, B. Hernández, En pozas de naciente, LN 194550 View Materials 558200, BHB 470.17” ( INBC)   . Paratypes: 1♂, on microscope slide, 1♂, pinned with genitalia on microscope slide, labeled as for holotype but with codes BHB 470.23, BHB 470.19, respectively ( CNCI, INBC)   .

Derivation of specific epithet. This species is named in recognition of the significant contribution of Braulio Hernández Bogantes, an excellent parataxonomist working at INBio. He has collected and reared a large number of nematocerous Diptera   , including the paratypes of this species and further type material of D. suzukii   .


Instituto Nacional de Biodiversidad (INBio)


Canadian National Collection Insects