Olbiogaster nuxco Huerta & Hancock, 2019

Huerta, Heron, Dzul-Manzanilla, Felipe, Navarrete-Carballo, Juan C., Manrique-Saide, Pablo & Hancock, E. Geoffrey, 2019, Olbiogaster Osten Sacken (Diptera: Anisopodidae) from Mexico, with the description of three new species, Zootaxa 4565 (4), pp. 475-492 : 479-482

publication ID	https://doi.org/ 10.11646/zootaxa.4565.4.2
publication LSID	lsid:zoobank.org:pub:EC3B414E-9699-4178-AC58-9D640C6B64CD
DOI	https://doi.org/10.5281/zenodo.5942461
persistent identifier	https://treatment.plazi.org/id/8B1E550E-FF8C-C817-FF07-2174FAF377E1
treatment provided by	Plazi
scientific name	Olbiogaster nuxco Huerta & Hancock
status	sp. nov.

Treatment

Olbiogaster nuxco Huerta & Hancock , new species

( Figs. 2 View FIGURE 2 A–C, 3A–D, 4A–B, 5B–C, 6E–G, 7A–E, 10)

Type material. ♂, labeled: HOLOTYPE, Olbiogaster nuxco sp. nov. MEXICO, Guerrero, Municipio Tecpan de Galeana, Localidad Nuxco, playa, Trampa Malaise , 30-January-2013. Col. Morales-Ríos, E. GPS: 17° 11’ 45.22” N; 100° 46’ 6.79’’ W; 15 m. a. s. l. ( CAIM; slide-mounted). GoogleMaps

Paratypes: 17 specimens (6 ♂, 11 ♀ of which 1 ♂ and 1 ♀ are deposited in the Hunterian Museum, University of Glasgow, Nos 162236; 162237) same data as holotype, except GoogleMaps , 1 ♂, 13-February-2013 ; 1 ♀, 17-March-2013 (slide-mounted) ; 1 ♂ and 2 ♀, on pin ; 3 ♂ (2 ♂, 25-February-2013 ) and 1 ♀, ethanol.

Acapulco, Nuevo Centro Población , GPS: 16° 50’ 19.04” N; 99° 50’ 29.09’’ W; 92 m. a. s. l. ( CAIM), 15- December-2014, colecta directa posado sobre piscina, Col. Dzul-Manzanilla, F., 1 ♂ (slide-mounted) GoogleMaps , 7 ♀ (ethanol) , same data, except 1 ♀, 27-January-2016, aspirador bucal, dentro de una casa.

Diagnosis. Male: distinctive pattern of the mesonotum, with a dark brown central stripe extending to the pronotum, surrounded by a U-shaped black stripe ( Fig. 2C View FIGURE 2 ); coxae black; fore and midfemur yellow, except for subbasal narrow dark brown ring, hind femur dark brown, except for basal 2/3 yellow ring; haltere white. Female: mesonotum yellow, pleura yellow, some sclerites abdominal with dark brown tinges; fore and midcoxae yellow, with dark brown tinge, hind coxae dark brown; fore and midfemur yellow, except for subbasal narrow dark brown ring, hind femur dark brown, except basal 2/3 yellow ring.

Description. Body length (including the antenna), 8.0 mm.

Head ( Fig. 2 View FIGURE 2 B–C). Black pollinose, wider than long; eyes dichoptic, broadly separated, facets of similar width, with scarce interommatidial setae; three ocelli present, of similar size, ocular triangle black, shining; vertex, occiput, and frons gray pollinose; clypeus produced, dark brown, shiny, laterally yellow, pilose ( Fig. 2B View FIGURE 2 ). Scape and pedicel yellow, black pilosity; flagellum black ( Fig. 2A View FIGURE 2 ), with 14 cylindrical flagellomeres, about 1.2 times as long as wide, flagellomeres with scattered setae; antenna 3.38 mm long. Mouthparts yellow; labellum laterally flattened; premental apodeme Y-shaped; palpus setose, longer than labellum, first palpomere very short, about 1/3 as long as second, 2nd segment cylindrical, 3rd segment greatly swollen, with small, deep sensory pit, 4th and 5th cylindrical.

Thorax. ( Figs. 3 View FIGURE 3 A–B). Mostly black. Mesonotum covered with fine whitish setulae, with distinctive pattern, with a dark brown central stripe extending to the pronotum surrounded by U-shaped black stripe ( Fig. 2C View FIGURE 2 , 3A View FIGURE 3 ). Scutellum yellow, postscutellum black, with patch of 7–8 fine, whitish lateral setae. Pleural sclerites uniformly black, shining ( Fig. 3B View FIGURE 3 ). Post-pronotal lobe with ca. 40 fine whitish setae. Anepisternum with patch of 20 fine whitish setae on dorsal lobe, anepimeron with small patch of 15 fine whitish setae on postero-dorsal portion.

Legs. ( Fig. 3C View FIGURE 3 ). Coxae black, setose; fore and midfemur yellow, except for subbasal narrow dark brown ring, hind femur dark brown, except for basal 2/3 yellow ring; fore tibia mostly yellow, mid and hind tibia darker, hind tibia dark brown subapically. Tarsi darker, except base of tarsus of fore leg, more pale; tibiae and tarsi with dense black pilosity; all legs with setulae irregularly arranged; tibiae densely covered with irregular rows of setae; tibiae and tarsi with stiff, stout, black setae. Apical comb of seven setae present at inner face of hind tibia; tibial spurs 1:2:1. Tarsal claws black.

Wing ( Fig. 4A View FIGURE 4 ). Membrane mostly translucent, with veins dark brown, radial veins darker, membrane brownish around r-m, m-m, and m-cu, and on basal fifth of cell sc. Length, 5.0 mm; width, 1.8 mm. Membrane irregularly covered by microtrichia. C extending past R 5 at least 1/3 of distance to M 1. R 1 and R 2+3 meeting C very close together. Dark stigma covering 3/4 of R 2+3. R 5 ending before wing tip. Cross-vein r-m short, connecting to just before mid of discal cell. M 1, M 2 and M 3 arising distally from discal cell, m-cu oblique. CuA distal half sinuous. CuP complete, A incomplete. C, Sc, radials, base of M and CuA with macrotrichia. Sc complete; R 1 long, extending about 3/4 of wing length. Haltere white, pedicel and capitulum covered with short setae.

Abdomen. ( Figs. 3 View FIGURE 3 A–B, D). Tergites dark brown, tergites 1 to 3 with pale posterior band, tergites 4 and 5 with posterolateral margins pale. Sternites 1 and 2 dark brown medially with broad pale areas, sternite 3 dark brown with pale area posteriorly, sternites 4 to 7 dark brown.

Male terminalia ( Figs 5 View FIGURE 5 B–C). Dark brown. Gonocoxites with patch of 50–55 large setae; gonostylus ( Fig. 6F View FIGURE 6 ) with two elongated, thin setae subapically and one spine-like, straight, strongly sclerotized, with distal portion abruptly curved inwards; aedeagal guide (ventral plate) with basal apodeme ( Fig. 6E View FIGURE 6 ), midportion enlarged, tapering, distal portion with a pair of long setae directed anterolaterally and 2 to 3 pairs of rows of short, coarse spines, apex with a short pair of coarse spine directed ventrally; sternite 10 ( Fig. 6G View FIGURE 6 ) complex, with two pairs of elongated slender arms connected basally, midportion curved, inner arms with apical spine, outer arms with a group of long, curved setae; cerci setose ( Fig. 5C View FIGURE 5 ).

Female. Similar to male. Body length (including the antenna), 7.9 mm, with the following notable sexual differences.

Head ( Figs 7 View FIGURE 7 A–B). Scape and pedicel yellow, pilosity black; flagellum black, 14 cylindrical flagellomeres.

Thorax. ( Figs 7 View FIGURE 7 A–B). Overall color yellow. Scutellum dark brown, with lateral margins yellow, postscutellum almost completely black, except anterolateral area yellow, with patch of six fine, whitish lateral setae. Pleural sclerites yellow, shining. Pleura yellow, some sclerites with dark brown tinge; anepisternum with patch of 23 fine whitish setae on dorsal lobe, anepimeron with broad dark brown tinge, small patch of 12 fine whitish setae on postero-dorsal portion; laterotergite with broad, basal dark brown tinge; metepisternum almost completely covered with dark brown tinge.

Legs. ( Fig. 7C View FIGURE 7 ). Fore and midcoxae yellow, with dark brown tinges, hind coxae dark brown; fore and midfemur yellow, except for subbasal narrow dark brown ring, hind femur dark brown, except 2/3 basal yellow ring; fore tibia mostly yellow, mid and hind tibia darker, hind tibia dark brown subapically.

Wing ( Fig. 4B View FIGURE 4 ). Length, 5.8 mm; width, 2.0 mm.

Abdomen. ( Figs 7A, D View FIGURE 7 ). Tergites 1 to 5 dark brown with pale posterior bands, more distinctive on anterior tergites, tergites 6 and 7 dark brown. Sternite 1 dark brown, sternite 2 dark brown basally, posterior part with broad yellow areas, sternites 3 and 4 dark brown medially, with yellow broad areas, sternites 5–6 dark brown, with yellow limited areas; sternite 7 with yellow area anterior; cerci dark. Spermathecae three, pyriform, equal in size ( Fig 7E View FIGURE 7 ).

Bionomics. The specimens were collected in a Malaise trap and direct collection in beach vegetation in Guerrero.

Distribution. Mexico (Guerrero). Fig. 10 View FIGURE 10 .

Etymology. This species is named after Nuxco, as the name of the type locality, used in apposition.