Allodia nyeriensis Magnussensp.

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 : 304-306

Allodia nyeriensis Magnussensp. nov.

( Figs 1 , 2 )

Diagnostic characters. A. nyeriensis can best be separated from the other species described here based on the following combination of characters: Rm is almost twice as long as the stem of posterior fork; the dorsal lobe of the gonostylus have a small inconspicuous area at apex, as in A. mazumbaiensis , A. drakensbergensis and A. keurbosensis ; the median lobe is similar to A. keurbosensis , but with more setae on the ventral margin and a well- defined heel-shaped posteroventral corner of the lobe ( Fig. 10 ); the basal part of the gonostylus is different from all the other species ( Fig. 1G ). The shape of the female hypogynal valves ( Fig. 2 ) differs from A. jaschhofi ( Fig. 8 ).

Type material. Holotype ♂. Kenya, Nyeri, Mount Kenya National Park, Base camp at Naro Moru River Lodge (0.17027°S, 37.21500°E, 3050 masl), sweep net, bamboo forest. 18–19 Aug. 2008. TSZD-JKJ-104239. Leg. J. Kjaerandsen. (TMU). Paratypes 1 ♂, 2 ♀, data as for holotype. (TMU).

Measurements. Male (n = 2): Body length 3.04–3.91 mm; wing length 2.91–3.26 mm. Female (n = 2): Body length 4.00–4.35 mm; wing length 3.33 mm

Coloration. Head and clypeus brown. Mouthparts and palpomeres whitish yellow. Antennae brown, with scape, pedicel and basal half of first flagellomere whitish yellow. Scutum brown, with yellow lateral margin. Lateral sclerites brown. Wings clear without markings. Halteres whitishyellow. Legs whitish yellow. Abdomen brown, tergites 2–4, 2–5 in females, with lateral area yellow, broadening towards posterior margin. Terminalia yellow.

Head. Two ocelli, near eye margin. Head covered with fine trichia, except for row of 5 short bristles near eye margin, above ocellus. Antennae in males about twice as long as thorax, in females slightly longer than thorax (1.13 mm/1.09 mm, respectively). Scape and pedicel with several setae on distal third. Flagellomeres cylindrical, densely covered with fine trichia. First flagellomere twice as long as scape.

Thorax. Antepronotum with 5–6 strong setae. Scutum covered with uniform small, pale setae, with strong lateral prealar and postalar setae, more numerous close to wing base. Discal bristles absent. Scutellum with 2 strong bristles. Laterotergite with 2 long and 3 shorter setae. Other lateral sclerites bare.

Legs. All tibiae with short setae arranged in rows. Mid tibia with 5–7 anterodorsal and 25–28 posterodorsal bristles, on distal 3/4 of segment. Hind tibia with 5–7 anterodorsal and 8 posterodorsal bristles.

Wings. Sc short, ending in R, rm almost twice as long as stem of posterior fork, base of anterior fork slightly before base of posterior fork. R1 with setae on distal 2/3 and R5 with setae on distal 3/4.

Male terminalia ( Fig. 1 ). Tergite 9 medially divided, each part rounded, covered with minute trichia, with one strong apical bristle, two short and three longer setae. Cerci covered with fine trichia, with longer setae apically; pseudocerci with several long setae medially and apically ( Fig. 1F ). Dorsal lobe of gonostylus oblong, apex rounded with small, roundish, pouch-like membranous structure internally; outer surface with numerous strong setae. Median lobe with heel-shaped posteroventral corner; 9 strong and 4 shorter setae on posterior margin, plus 4 minute setae on interior surface; one long seta on ventral edge, with short distance from ventral margin (about 1/6 of total distance). Ventral lobe elongated, slightly arched, with 5–6 setae apically. Basal part of gonostylus with ventral semi-circular structure, bearing about 8 short setae, and second small pointed dorsal structure with one short seta ( Fig. 1G ). Hypandrial lobe heavily sclerotized, slender, protruding inwards at apex ( Fig. 1E ).

Female terminalia ( Fig. 2 ). Tergite 8 elongated. Cerci two-segmented; first segment oblong, arcuate, fused at basis; second segment oblong, narrower than first segment, with several long setae. Gonapophyses fused, membranous, tongue-shaped with small setae around edge. Hypogynal valves elongated, triangular shaped, pointed towards apex; one long seta on tip; labia membranous.

Etymology. Named after the region of the type locality.

Remarks. The specimens have become pale after years of storage in ethanol. The measurements were made on ethanol preserved specimens. Wing length for females was measured on one specimen only.

Figures

FIGURE 1. THe MALe TeRMINALIA OF A. nyeriensis. A, DORSAL VIeW;B, LATeRAL VIeW; C, VeNTRAL VIeW; D, GONOSTYLUS FROM INNeR SIDe; E, HYPANDRIAL LObe; F, DORSAL STRUCTUReS; G, BASAL PART OF GONOSTYLUS.Abbreviations: AP = APODeMe, b PAR = bASAL PART, CeRC = CeRCI, D Lb = DORSAL LObe, GC = GONOCOXITe, HYP = HYPOPROCT, HYP Lb = HYPANDRIAL LObe, I bR = INTeRNAL bRANCH, M Lb = MeDIAN LObe,PS CeRC = PSeUDOCeRCI,TG 9 = TeRGITe 9. SCALe bAR = 1µM.

FIGURE 2. THe FeMALe TeRMINALIA OF A. nyeriensis. A, LATeRAL VIeW; B, DORSAL VIeW; C, HYPOGYNIUM, VeNTRAL VIeW. Abbreviations: Ce = CeRCI, G AP = GONAPOPHYSIS, HYP V = HYPOGYNAL VALVeS, LAb = LAbIA, ST = STeRNITe,TG = TeRGITe. 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.

FIGURE8. THe FeMALe TeRMINALIA OF A. jaschhofi. A, LATeRALVIeW; B, DORSALVIeW; C, HYPOGYNIUM,VeNTRAL VIeW.SCALe bAR = 1µM.