Allodia keurbosensis Magnussen, 2018

Magnussen, Trude, Kjaerandsen, Jostein, Johnsen, Arild & Søli, Geir E. E., 2018, Six new species of Afrotropical Allodia (Diptera: Mycetophilidae): DNA barcodes indicate recent diversification with a single origin, Zootaxa 4407 (3), pp. 301-320 : 309-311

Allodia keurbosensis Magnussen sp. nov.

( Figs 5 , 6 )

Diagnostic characters. A. keurbosensis can best be separated from the other species described here, based on the following combination of characters: Rm almost twice as long as stem of the posterior fork; the dorsal lobe of gonostylus is similar to A. nyeriensis , A. mazumbaiensis and A. drakensbergensis ; the median lobe is most similar to A. drakensbergensis , but with more setae on the ventral margin ( Fig. 10 ); the shape of the ventral lobe is different to that of A. drakensbergensis ( Fig. 4B ); the basal part of gonostylus different from all the other species ( Fig. 6C ).

Type material. Holotype ♂. South Africa : Eastern Cape , Keurbos forest (33.9072°S, 23.7285°E, 500 masl), malaise trap, indigenous montane forest. 28–30 Mar. 2009. Leg. A.H. Kirk-Spriggs; S. Otto. (BMSA).

Measurements. Male: Body length 3.91 mm; wing length 3.23 mm.

Coloration. Head and clypeus brown. Mouthparts and palpomeres yellow. Antennae brown, with scape, pedicel and first half of first flagellomere yellow. Scutum brown. Antepronotum whitish anteriorly, lateral sclerites otherwise brown. Halteres whitish. Legs whitish. Wings clear without markings. Abdomen brown, with small yellow triangular area on tergites 3 and 4. Terminalia yellow.

Head. Two ocelli, located close to eye margin. Head covered with fine trichia, except for row of about 8 short bristles near eye margin, above ocellus. Antennae about twice as long as thorax. Scape and pedicel with several setae on distal third. Flagellomeres cylindrical, densely clothed with fine trichia. First flagellomere twice as long as scape.

Thorax. Antepronotum with 4 strong setae. Scutum covered with uniform small, pale setae, with strong lateral prealar and postalar setae. Discal bristles absent. Scutellum with 3 strong bristles. Laterotergite with 3 long setae. Other lateral sclerites bare.

Legs. Fore-, mid and hind tibiae with short setae arranged in rows. Mid tibia with 4 anterodorsal and 20 posterodorsal bristles, on distal 3/4 of segment. Hind tibia with 6 anterodorsal and 6 posterodorsal bristles.

Wings. Sc short, ending in R, rm almost twice as long as stem of posterior fork, base of anterior fork just opposite base of posterior fork. R1 and R5 setae, absent at basis of veins.

Male terminalia ( Fig. 6 ). Tergite 9 medially divided, each part rounded, covered with minute trichia, with two strong bristles and three long setae. Cerci clothed with fine trichia, with some long setae apically; pseudocerci with several long setae randomly medially and apically. Dorsal lobe of gonostylus oblong, apex rounded with small, pouch-like membranous area internally, outer surface with numerous strong setae. Median lobe with straight ventral side, with row of 7 strong setae on posterior margin; 10 shorter present on posterior margin and on lobe surface; three setae on ventral side, two close to posteroventral corner, one about one third of the total distance from posterior edge. Ventral lobe slightly club-shaped with 6-7 setae apically, plus one on posterior edge. Basal part of gonostylus with two bulbous structures of equal size, each with 4 short setae. Hypandrial lobe elongated, pointed inwards, with strong sclerotized apodemes ( Fig. 6A ).

Etymology. Named after the type locality

Remarks. Measurements were made on pinned specimen.

Figures

FIGURE 4. THe MALe TeRMINALIA OF A. drakensbergensis. A, LeFT: DORSAL VIeW, RIGHT: VeNTRAL VIeW; B, GONOSTYLUS FROM INNeR SIDe;C, BASAL PART OF GONOSTYLUS.SCALe bAR = 1µM.

FIGURE 5. HAbITUS Allodia keurbosensis sp. nov. HOLOTYPe. PHOTO: KARSTeN SUND, NATURAL HISTORY MUSeUM, UNIVeRSITY OF OSLO.

FIGURE6. THe MALe TeRMINALIA OF A.keurbosensis. A, LeFT:DORSAL VIeW,RIGHT:VeNTRAL VIeW;B, GONOSTYLUS FROM INNeR SIDe;C, BASAL PART OF GONOSTYLUS.SCALe bAR = 1µM.

FIGURE10. VARIATION beTWeeN AFROTROPICAL Allodia, GONOSTYLUS FROM INNeR SIDe.A, A.nyeriensis; B, A.mazumbaiensis; C, A. drakensbergensis; D, A.keurbosensis; E, A.jaschhofi; F, A. karkloofensis. SCALe bAR = 1µM.