Zygomyia napoensis, Kurina & Õunap, 2023

Kurina, Olavi & Õunap, Erki, 2023, Morphological and molecular data reveal fifteen new sympatric Zygomyia Winnertz, 1864 (Diptera: Mycetophilidae) species from Ecuador, Zootaxa 5227 (1), pp. 1-49 : 18-20

Zygomyia napoensis sp. nov.

( Figs 2E , 9A–E , 19F )

urn:lsid:zoobank.org:act:B793783A-F20D-4F90-8696-5215B39BA2F9

Type material. HOLOTYPE ♂, ECUADOR, Napo Province, Yanayacu Biological Station , 0.6164S 77.8831W, alt. 2122 m, 1–3.ix.2019, X. Mengual leg., Malaise trap (mounted from alcohol with terminalia in glycerine, INABIO; specimen code: MECN-EN-DIP-4864; one fore leg used for DNA extraction, GenBank accession number: OP747428 ) . PARATYPE ♂, same as holotype (mounted from alcohol, ZFMK) .

Diagnosis. In having the posteroventral margin of the gonocoxites widely concave and the one-lobed ventral branch of the gonostylus bearing modified megasetae, Z. napoensis resembles Z. triseta . It differs by transversally extended ventral branch of the gonostylus (sub-quadrate in Z. triseta ), which bears one sabre-shaped megaseta posteriorly (three modified megasetae anteromedially and posteriorly in Z. triseta ), and a posteromedially extending digitate, apically mushroom-shaped process (without anteromedial process in Z. triseta ). The dorsal branch of the gonostylus consists of three lobes different in shape and size (simple, posteriorly bifurcate in Z. triseta ).

Description. Male (n = 2). Body length 2.3–2.5 mm. Wing length 2.2–2.3 mm; ratio of length to width 2.67.

Head. Dark yellow with numerous dark setae. Two ocelli, surrounded by narrow dark-brown areas, close to eye margins. Clypeus yellow, somewhat lighter than head. Mouth-parts yellow to light brown. Palpus with all segments light brown, ratios of three apical segments 1:1.3:2.1. Scape, pedicel and flagellomeres light brown. Flagellomeres cylindrical, first flagellomere 1.38 × as long as broad, fourth flagellomere as long as broad, apical flagellomere 2.5 × as long as broad basally. Flagellomeres with short brownish setae.

Thorax. Mesonotum dark yellow. Pleural parts yellow with lower hind corner of anepisternum brown.All bristles and setae on thorax brown. Scutellum with setae, including four strong marginal bristles. Antepronotum with setae, including 8–9 bristles of different lengths. Proepisternum with setae including 4 stronger bristles. Anepisternum with a number of posteriorly-directed short setae and 9–10 bristles of different lengths on dorsal part. Anepimeron with short setae and 2 bristles on dorsal part. Laterotergite with 9–10 dorsally-directed setae of different length medially. Metepimeron with 5 setae on posterior part. Halter with stem yellow and knob brownish. Legs yellow, except mid- and hind femora dorsally somewhat brownish. Tarsi appear darker, due to dense brown setation. Whole anterior side of fore coxa, apical fifth of anterior side of mid coxa and all femora clothed in dark setae. Hind coxa with 4–5 short setae on posterior side apically. Mid femur with 4 apicoventral bristles of different size, hind femur with 4 apicoventral bristles of different size. Mid tibia with 2 a, 5 d (progressively longer towards apex), 3 p and 2 v (distal one half as long as proximal one). Hind tibia with 6–7 a, 4 d (progressively longer towards apex). Hind tibia with apical comb of setae posteriorly. Length ratio of femur to tibia for fore, mid and hind legs: 1.23–1.38, 1.10, 0.88–0.89. Length ratio of tibia to basitarsus for fore, mid and hind legs: 1.24–1.44, 1.29–1.39, 1.55. Wing membrane hyaline with light brownish tinge, without markings. Veins light brown. R 1 and R 4+5 with strong setae on both sides. Crossvein and bM-Cu glabrous. M 1, M 2 with setae on dorsal side. CuA devoid of setae. m-stem about two times as long as r-m. Costa not extending beyond R 4+5.

Abdomen. Entirely brown. Terminalia ( Figs 9A–E , 19F ) yellow. Posteroventral margin of gonocoxites concave. Posterior half of gonocoxite setose with setae stronger posteromedially and laterally. Ventral branch of the gonostylus sub-rectangular, setose, with (1) posterolateral corner drawn out, bearing aggregations of deviated setae, (2) two stronger setae at medial margin, (3) posteromedial corner drawn out to digitate membranous process with apical mushroom-shaped formation, and (4) sabre-shaped megaseta on ventral surface medially (in ventral view exposed at posterior margin). Dorsal branch of the gonostylus with three lobes of different size and shape: (1) lateral lobe about two times longer than wide, posteriorly truncated, dorsally stepped, setose, (2) medial lobe broad, about as long as wide, with two digitate prongs posterolaterally, three setae at posterior margin, posteromedial corner drawn out to rounded sub-lobe, and (3) anterior lobe large, shoe-shaped, with strong marginal setae. Aedeagus narrow, apically protuberant, rounded. Parameres apically narrowly rounded not extending over aedeagus posteriorly, anteriorly bilobed. Gonocoxal apodemes narrow.

Female. Unknown.

Etymology. The species is named after the collecting locality in Napo province, Ecuador.

Figures

FIGURE 2. Habitus of Zygomyia species from Ecuador (all photos, except Z. bicolor, are taken from holotypes). A, Z. spinosa sp. nov.; B, Z. ximoi sp. nov.; C, Z. bicolor Edwards, 1934 (MECN-EN-DIP-4873); D, Z. uniordata sp. nov.; E, Z. napoensis sp. nov.; F, Z. trilobata sp. nov.; G, Z. triseta sp. nov.; H, Z. talpaeforma sp. nov. Scale bars = 1 mm.

FIGURE 9. Zygomyia napoensis sp. nov., male terminalia (holotype, MECN-EN-DIP-4864). A, B, ventral view; C, dorsal view; D, posterior view; E, gonostylus, dorsal view. Scale bar = 0.1 mm (A–D) and 0.02 mm (E).

FIGURE 19. Aedeagal apparatus of Zygomyia species from Ecuador (all photos are taken from holotypes). A, Z. acrotricha sp. nov.; B, Z. pectinella sp. nov.; C, Z. ximoi sp. nov.; D, Z. flamma sp. nov.; E, Z. trilobata sp. nov.; F, Z. napoensis sp. nov. Scale bar = 0.1 mm. Abbreviations: aed = aedeagus, gc ap = gonocoxal apodeme, par = paramere.