Zygomyia diversiseta, 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 : 11-12

Zygomyia diversiseta sp. nov.

( Figs 1A , 5A–E , 21A )

urn:lsid:zoobank.org:act:266DF40B-0499-4A04-B1AF-1BD83A3D39E7

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-4860; part of abdomen used for DNA extraction, GenBank accession number: OP747423 ).

Diagnosis. Distinguished from other species in having five bristles on the anepimeron (2–4 in case of other species) and unique male terminalia, including posteroventral margin of gonocoxites with a pair of convoluted, apically pointed non-setose outgrowths and the ventral branch of the gonostylus elongately oval, about four times as long as wide medially, with five modified megasetae internally.

Description. Male (n = 1). Body length 3.1 mm. Wing length 2.9 mm; ratio of length to width 2.79.

Head. Dark yellow with numerous dark setae. Two ocelli close to eye margins. Clypeus yellow, somewhat lighter than head. Mouth-parts yellow to light brown. Palpus with 3–4 segments dark yellow, apical segment brownish, ratios of three apical segments 1:1.4:1.75. Scape, pedicel and basal half of first flagellomere yellow, rest of flagellomeres light brown. Flagellomeres cylindrical, first flagellomere elongated, 3.0 × as long as broad, fourth flagellomere 1.57 × as long as broad, apical flagellomere 2.2 as long as broad. Flagellomeres with short yellowish setae.

Thorax. Mesonotum dark yellow. Pleural parts somewhat lighter. All bristles and setae on thorax brown. Scutellum with marginal setae, including four strong bristles. Antepronotum with setae, including 5 bristles of different lengths. Proepisternum with setae including 2 stronger bristles.Anepisternum with a number of posteriorlydirected short setae and 4 bristles of different lengths on dorsal part. Anepimeron with short setae and 5 bristles on dorsal part. Laterotergite with 8 dorsally-directed short setae medially. Metepimeron with 1 seta on posterior part. Halter light brown. Legs yellow (only coxae, hind femora and hind tibiae present in holotype). Whole anterior side of fore coxa, apical fourth of anterior side of mid coxa and hind femur clothed in dark setae. Hind coxa with 3 setae on posterior side apically. Hind tibia with 5 a, 4 d, 1 p. Length ratio of femur to tibia for hind leg: 0.80. Wing membrane with brownish tinge, without markings. Veins light brown. R 1 and R 4+5 with strong setae on both sides. Crossvein rm and bM-Cu glabrous. Dorsal surfaces of M 1, M 2 and CuA devoid of setae on dorsal surface. m-stem somewhat longer than r-m. Costa not extending beyond R 4+5.

Abdomen. Tergites brown,sternites yellow.Terminalia( Figs5A–E , 21A )yellow to blackish brown.Posteroventral margin of gonocoxites slightly undulating, with a pair of convoluted, apically pointed non-setose outgrowths, which have small, oval and setose basal lobes. Behind those (= exposed more dorsally in ventral view) an additional pair of convoluted and much longer outgrowths, connected laterally with gonocoxites by basal blackish apodemes. Gonocoxite sparsely setose with a row of sub-marginal strong and long setae deviating from other setosity. Ventral branch of the gonostylus elongately oval, about four times as long as wide medially, with five modified megasetae internally from anterior to posterior as follows: (1) two twisted and pointed alongside megasetae, (2) club-shaped megaseta with hair-like basal outgrowth, (3) unmodified, pointed megaseta, and (4) deeply bifurcated megaseta. Dorsal branch of the gonostylus bifid, with (1) more lateral finger-shaped lobe posteriorly setose, including two pointed megasetae, and (2) more medial finger-shaped posteriorly setose lobe, about half as long as lateral lobe. Aedeagus apically widely hastate. Parameres large, crescent-shaped, apically somewhat hooked, extending over aedeagus posteriorly. Gonocoxal apodemes with anterolateral outgrowth, apically slightly widening, hooked, setose.

Female. Unknown.

Etymology. The specific epithet is Latin, diversiseta [having diverse setae], referring to the number of diverse megasetae internally on the gonostylus.

Figures

FIGURE 1. Habitus of Zygomyia species from Ecuador (all photos are taken from holotypes). A, Z. diversiseta sp. nov.; B, Z. longistyla sp. nov.; C, Z. flamma sp. nov.; D, Z. acrotricha sp. nov.; E, Z. paniculata sp. nov.; F, Z. geniculata sp. nov.; G, Z. pectinella sp. nov.; H, Z. comata sp. nov. Scale bars = 1 mm.

FIGURE 5. Zygomyia diversiseta sp. nov., male terminalia (holotype, MECN-EN-DIP-4860). A, C, ventral view; B, posterior view; D, dorsal view; E, ventral branch gonostylus, dorsal view. Scale bar = 0.1 mm.Abbreviations:gc pvmo = medial outgrowth of posteroventral margin of gonocoxites, gst db = dorsal branch of gonostylus, gst vb = ventral branch of gonostylus.

FIGURE 21. Aedeagal apparatus of Zygomyia species from Ecuador (all photos are taken from holotypes). A, Z. diversiseta sp. nov.; B, Z. spinosa sp. nov.; C, Z. paniculata sp. nov.; D, Z. uniordata sp. nov. Scale bar = 0.1 mm.