Cluzobra matilei, Kurina, Olavi, 2008

Kurina, Olavi, 2008, Cluzobra matilei sp. n. from French Guyana, with notes on congeners (Diptera: Mycetophilidae), Zootaxa 1874, pp. 63-68 : 65-67

Cluzobra matilei sp. n.

Figs 2, 4, 5 , 6, 7 , 12, 13 .

Material examined: Holotype, ɗ, FRENCH GUYANA, Régina: Kaw Mts., Point Road 40, Malaise trap; N= 4o33’562’’ W=52o12’425; alt. 300 m a.s.l., leg. K. Sarv 12.II – 03.III. 2007. Paratypes, 5 ɗɗ, same as holotype; 3 ɗɗ, same as holotype except 0 3. – 27.III. 2007; 1 ɗ, same as holotype except leg. V. Soon and 0 6. – 12.I. 2003.

Diagnosis: Wing patterned, with both micro- and macrotrichiae. Two ocelli. Anepisternum setose. Male gonocoxite ventroapically bare, indented and without paired blunt spines. Male gonostylus blackish brown, unbranched, apically rostrum-shaped.

Description: Male. Length of wing 2.35–2.63, 2.51 [2.63] mm.

Head dull yellow, with surroundings of ocelli brown. Two ocelli, separated from eye margins by about their own diameter. Mouthparts yellowish. Palpus with all segments brown. Palpomere ratios 1: 1.09–1.10, 1.10 [1.10]: 1.64–2.00, 1.79 [2.00]: 2.64–3.00, 2.85 [3.00]: 4.20–5.00, 4.71 [5.00]. Clypeus obovoid, with long dark bristles. Scape and pedicel yellow, flagellomeres yellowish, basally darker. Flagellomeres cylindrical, about 1.5 times as long as broad.

Thorax yellowish brown, with scutum and mediotergite somewhat darker, and antepronotum and proepisternum lighter. All bristles and setae dark. Laterotergite and mediotergite with bristles, anepisternum with setae on upper part. Scutellum yellowish brown with six stronger scutellars and some smaller setae. Halteres yellow, with brownish knob.

Legs. Fore and mid coxae brownish. Apical half of hind coxae posteriorly brownish. Fore and mid femora entirely brownish, hind femora yellow with brown band at each end. Fore and mid tibiae yellow, hind tibia basally slightly brownish. Tarsi yellow with darker setae. Tibial spurs dark brown. Ratio of femur to tibia for fore, mid and hind legs: 0.85–0.91, 0.89 [0.89]; 0.83–0.91, 0.88 [0.88]; 0.77–0.83, 0.81 [0.79]. Ratio of tibia to basitarsus for fore, mid and hind legs: 0.88–1.00, 0.92 [0.88]; 1.11–1.21, 1.17 [1.20]; 1.56–1.62, 1.59 [1.58].

Wings patterned (fig. 5). Wing apex widely smoke-coloured to brownish. Cubital cell apically concolorous. R4, apical half of r-m, m-stem and basal fifth of medial fork surrounded by intense brown patches. CuA2 surrounded by narrow brownish band. Microtrichia and macrotrichia almost uniformly distributed on wing membrane, except basal cell, which has, besides of microtrichia, only few macrotrichia on distal half. Costa reaches 0.39 – 0.47, 0.44 [0.47] from R5 to M1. M-stem 1.19 – 1.41, 1.27 [1.27] times as long as r-m.

Abdomen entirely light brown with sternites lighter. All setae dark. Terminalia ( Figs 6, 7 , 12, 13 ) yellowish brown except well sclerotized and blackish-brown, one-lobed gonostyli. Gonocoxite ventroapically extended, without setae or spines. Tergite IX quadrate, with almost straight posterior margin, covered with strong dark setae. Cercus bifid with normal setae.

Female. Unknown.

Biology. Unknown.

Etymology. The species is named in honour of late Prof. Loïc Matile (1938-2000)

to mark his tremendous contribution to the studies of Sciaroidea (= Mycetophiliformia, cf. Amorim & Rindal 2007) all over the world and of the genus Cluzobra , in particular.

Discussion. According to Matile’s key ( Matile 1996), the new species runs to couplet 17: the wings being covered with both micro and macrotrichia, having two ocelli, anepisternum being setose, having brown coxae and brownish fore and mid femora. The scutum, however, is more brownish than yellowish, but the specimens of C. variegata and C. vicina – the alternatives under couplet 17 by Matile – from the Kaw Mountains have the scutum brownish as well. C. matilei also shares the general appearance of the male terminalia with C. variegata and C. vicina (both illustrated for comparison) having a moderately intended ventroapical margin of gonocoxite and well sclerotized one-lobed gonostylus. However, the new species lacks blunt apical paired spines on the gonocoxite, unlike the other two species, and the ventroapical margin of gonocoxite is bare, while it is setose in case of other two species. C. matilei has the gonostylus almost of equal width and apically rostrum shaped. C. variegata and C. vicina have the gonostylus basally much broader: it is humpbacked in C. vicina and heavily tapered in C. variegata . The new species, unlike the other two species, lacks bristles on dorsal surface of gonostylus. The wing pattern of the new species is more similar to that of C. variegata , while C. vicina has the smoke-coloured wing apex divided by an uncoloured patch.

Figures

FIGURES 1 – 5. Habitus, thorax and wing photos of Cluzobra species. 1. Cluzobra vicina Matile, 1996. 2, 4, 5. Cluzobra matilei sp. n. 3. Cluzobra variegata Matile, 1996.

FIGURES 6 – 11. Male terminalia of Cluzobra species, dorsal view, tergite IX removed. 6, 7. C. matilei sp. n. 8, 9. C. vicina Matile. 10, 11. C. variegata Matile.

FIGURES 12 – 13. Male terminalia of C. matilei sp. n. 12. Lateral view. 13. Tergite IX and cerci, dorsal view. Abbreviations: aed, aedeagal complex; cerc, cercus; gc, gonocoxite; gst, gonostylus; tg 9, tergite IX.