Cordyla pseudopusilla, Kurina, Olavi & Oliveira, Sarah Siqueira, 2015

Kurina, Olavi & Oliveira, Sarah Siqueira, 2015, A new case of an Holarctic element in the Colombian Andes: first record of Cordyla Meigen (Diptera, Mycetophilidae) from the Neotropical region, ZooKeys 520, pp. 87-108 : 92-97

Taxon classification Animalia Diptera Mycetophilidae

Cordyla pseudopusilla sp. n. Figs 10-11, 12-16, 17-19, 20-23, 38

Type material.

Holotype. ♂, COLOMBIA Boyacá / SFF Iguaque El Níspero / 05°38'N 73°31'W 2730 m / Malaise 1 13-28.x.2001 / P. Reina Leg. M. 2475 [IAvH]. Paratypes. 1♂, same as holotype except 28.x-14.xi.2001, M. 2482 [IAvH]; 1♂ 2♀♀, same as holotype except 2 07-21.xii.2001, M. 2585 [1♂ 1♀ at MZUSP, 1♀ at IAvH]; 1♂ 1♀, same as holotype except 19.i-03.ii.2002, M. 3067 [IZBE]; 1♂, same as holotype except 3-18.ii.2002, M. 3068 [IAvH].

Description.

Male (Fig. 10). Total length 2.9-3.4, 3.2 [3.4] mm (n=5).

Head (Fig. 11) dark yellow, mouthparts somewhat paler. Two ocelli encircled by brown areas, close to compound eyes. All three visible palpal segments (Fig. 11) setose, swollen antepenultimate segment light brown to brown, succeeding segments pale. 4th segment slightly widening apically, 5th segment apically tapering. Swollen palpal segment 1.8-2.2, 2.0 [1.8] times as long as broad medially from lateral view, and as long as height of compound eye. Ratios of three apical palpomeres 1.0: 0.8: 1.0. Antenna with 2+10 segments. Scape and pedicel yellow, flagellum somewhat darker, all with brown setosity. Scape elongate cup-shaped, 1.9-2.3, 2.1 [2.0] times as long as wide apically. Pedicel cup-shaped, 0.6-0.8, 0.7 [0.6] times as long as wide apically. Flagellomeres rectangular, about twice as wide as long. Apical flagellomere conical, about 2.2 times as long as wide basally. Thorax yellow, mesonotum medially somewhat darker. Hind margin of laterotergite narrowly brown. Katepisternum lighter. Anterior part of mesepimeron with a brown patch leaving anteroapical corner yellow. Haltere with a pale knob, stem basally pale and darker. All setosity on thorax brown. Scutum entirely covered with decumbent setae, scutellum with setae including two pairs of marginal bristles, laterals considerably shorter than internals. Antepronotum with setae including 5-7 [7] bristles, proepisternum with setae including 4-7 [7] bristles. Anepisternum with 4 bristles at hind margin and with ca. 40 setae on its upper two thirds. Mesepimeron and katepisternum bare. Laterotergite with 2-3 [3] bristles medially and ca. 10 setae along upper margin. Mediotergite bare. Metepisternum with 5-6 [5] bristles and ca. 10 setae. Wing with yellowish tinge, otherwise clear. Length 2.2-2.5, 2.4 [2.4] mm (n=10). Ratio of length to width 2.4-2.7, 2.6 [2.4]. All veins light brown. Radial veins seem darker because of setae on both surfaces; other veins bare. Crossvein r-m apically disjunct. M1+2 5-6 times as long as r-m. M2 not reaching wing margin, broken 0.5-0.7, 0.6 [0.5] times of M1+2 length before it. M1 and M4 apically very faint. Posterior fork begins clearly before anterior fork. Legs yellow, hind femora slightly infuscated at apical fifth. Tarsi seem darker because of dense brown setae. Hind coxa with 2-3 [3] posterolateral bristles basally, with one posterior bristle apically, and with ca. 10 weaker setae along posterolateral margin. Ratio of femur to tibia for fore-, mid- and hind legs: 1.5-1.6, 1.6 [1.5]; 1.0-1.1, 1.1 [1.1]; 1.0, 1.0 [1.0]. Ratio tibia to first tarsomere for fore-, mid- and hind legs: 1.0-1.1, 1.0 [1.0]; 1.1-1.3, 1.2 [1.1]; 1.4-1.5, 1.5 [1.4]. Fore-tibia with a spur about 0.5-0.6, 0.5 [0.6] of fore basitarsus; mid-tibia with anterior spur about 0.3, 0.3 [0.3] and with posterior spur about 0.6-0.7, 0.7 [0.7] of mid basitarsus; hind tibia with anterior spur about 0.5 and with posterior spur about 0.6 of hind basitarsus. Abdomen with first segment light brown, and 2-4 segments dorsally brownish, laterally yellow and ventrally pale yellow; succeeding segments entirely brown. Terminalia (Figs 12-19) with basal part of gonocoxite and cerci yellow; apical part of gonocoxite slightly darker; dorsal branch of gonostylus yellow; ventral and medial branches of gonostylus brown. Sternite 8 oblong, apical fourth conical, apex truncated, basal half membranous and bare, setae on apical quarter somewhat stronger than other setae, two apical setae well deviating from other setosity. Gonocoxite subquadrate, with narrow ventral incision about half height of gonocoxite. Ventral medial margin of gonocoxite apically angular and with membranous formations dorsad from the ventral surface of gonocoxite. Dorsal medial margin of gonocoxite simple. Cerci setose, setae on medial margin slightly stronger, deviating from other setosity; clearly separated, prolonged, subapically somewhat constricted, not protruding over gonocoxite. Basal half of gonocoxite bare, apical half with strong bristles. Dorsal branch of gonostylus elongated, tapering, without sclerotized comb, dorsal surface with homogeneous setosity. Ventral branch of gonostylus bare, about half as long as dorsal branch, with serrated lateral margin. Apical corners of ventral branch of gonostylus drawn out to small lobes: ventral wider and rounded, dorsal narrow. Dorsal margin of ventral branch of gonostylus with wide and shallow incision. Medial branch of gonostylus divided into two lobes: 1) ventral lobe with three apical protrusions separated by concavities (ventral finger-like protrusion well discernible at internal view), internal surface with one strong and three weaker setae, and 2) dorsal lobe curved, tapering, as long as the medial protrusion of ventral lobe and with three medial setae. Epiproct apically rounded, covered with small setulae. Hypoproct indiscernible.

Female. Total length 3.6-3.7, 3.6 mm (n=3). Wing length 2.4-2.5, 2.4 mm. Ratio of length to width 2.4-2.6, 2.5. Antennae 2+9 segments. In setosity and coloration similar to male. Terminalia (Figs 20-23) light brown. Cercus two-segmented: apical segment small, sunken into basal segment, with 2-3 long setae deviating from other setosity; basal segment long ovate, slightly sinusoidal and considerably wider than apical segment. Gonapophysis VIII membranous, visible in dorsal view. Tergite VIII rectangular, subequal to length of basal segment of cercus, apically angular in lateral view, basally and apically well emarginated in dorsal view. Sternite VIII tapering lateroapically, with deep medial cleft in ventral view. Tergite VII longer than tergite VIII, basally and apically well emarginated in dorsal view. Sternite VII apically conical, subequal to length of tergite VII. Tergite VI apically rounded in lateral view and with apicodorsal incision.

Biology.

Unknown.

Etymology.

The specific name is derived by the Greek prefix pseudo– from the Palaearctic species Cordyla pusilla Edwards, 1925 to indicate their morphological similarity.

Comments.

Belonging to the Cordyla fusca species-group (cf. Kurina 2001), Cordyla pseudopusilla sp. n. shares a 10-segmented flagellum and brown to dark brown swollen antepenultimate segment of palpus with five Palaearctic (viz. Cordyla bomloensis Kjærandsen & Kurina, 2004, Cordyla brevicornis Staeger, 1840, Cordyla geminata Sasakawa, 2005, Cordyla pusilla and Cordyla triloba Sasakawa, 2008) and three Nearctic (viz. Cordyla neglecta Johannsen, 1912, Cordyla recens Johannsen, 1912, Cordyla scutellata Garrett, 1925) species. Within these, the new species is remarkably similar to Cordyla pusilla and Cordyla neglecta . All three species have the ventral branch of gonostylus subquadrate with emarginated dorsal margin. However, the emargination is more pronounced in Cordyla pseudopusilla sp. n. The new species has the medial branch of the gonostylus with a curved dorsal lobe (straight in the other two species) and with deep concavities on the ventral lobe apically (more shallow in the other two species).