Aprionus oljonsbynensis, Jaschhof & Jaschhof, 2020

Jaschhof, Mathias & Jaschhof, Catrin, 2020, An update of Micromyinae (Diptera: Cecidomyiidae) taxonomy, with descriptions of a new genus and 13 new species from Northern Europe, Zootaxa 4750 (3), pp. 349-369 : 354-355

Aprionus oljonsbynensis sp. nov.

Figs 8–10

Diagnosis. This new Aprionus is distinguished by the following male genitalic characters in combination. The gonocoxal synsclerite has conspicuous, subtriangular protrusions ventromedially ( Fig. 10 , ↓ 4). The dorsal gonocoxal bridge extends unusually deeply into the abdominal cavity (↓ 5). The tegmen, whose lateral edges are slightly bulging on the basal half, has about 6 pairs of fingerlike, dorsomedially oriented processes, which intersect in the middle (↓ 6). Of the subanal plate, the longitudinal axis is strongly reinforced by sclerotization ( Fig. 9 , ↓ 7), all four corners are somewhat extended, and the central portions have 10 or so tiny, bright spots (holes?) arranged in two groups. Females and preimaginal stages of A. oljonsbynensis are unknown.

Other male characters. Body size 1.2 mm. Head. Eye bridge 2–3 ommatidia long dorsally. A single row of 9–12 postocular bristles. Neck of fourth flagellomere shorter than node; translucent sensilla thick, simply hairshaped ( Fig. 8 ). Palpus 4-segmented. Wing. R 1 twice as long as Rs. Legs. Claws sickle-shaped, 2–3 fine teeth near midlength. Empodia vestigial. Genitalia ( Fig. 10 ). Ninth tergite short; anterior edge somewhat irregular; posterior edge broadly rounded. Gonocoxal apodemes conspicuously broad; dorsal transverse bridge tapered towards the truncated apex, with strongly sclerotized median. Gonostylus small in relation to gonocoxa, dorso-ventrally flattened, in ventral view elongate and tapered towards the apex, the latter with fingernail-like tooth.

Etymology. The species epithet is derived from the type locality, Oljonsbyn. This is an ancient name for a district of Orsa, a small town located in Sweden’s Dalarna province.

Type material. Holotype. Male, Sweden, Dalarna, Orsa, Oljonsbyn , backyard with diverse flora including woody plants, 31 July–24 August 2016, Malaise trap, M. & C. Jaschhof, B. Oldhammer & K. Hedmark (spn. CEC 2693 in NHRS). Paratypes. 4 males, same data as the holotype (spns CEC2694 – CEC 2697 in NHRS) ; 2 males, same data but 17 September 2016 – 18 June 2017 (spns CEC2698 – CEC 2699 in SDEI) .

Other material examined. Sweden: 1 male, Småland, Gränna, Lönnemålen, spruce forest, 19 May–10 June 2004, MT, SMTP (trap 17, collecting event 966) (spn. CEC 2700 in NHRS) ; 1 male, Småland, Nybro, Bäckebo, Grytsjön NR, haymeadow at edge of old-growth mixed hemiboreal forest, 20 May–4 June 2005, MT, SMTP (trap 1001, collecting event 1328) (spn. CEC 2701 in NHRS) .

Figures

FIGURES 5–10. Male morphology of Aprionus mossbergi (5–7) and Aprionus oljonsbynensis (8–10), holotypes. 5: Genitalia, ventral. 6: Subanal plate, ventral. 7: Fourth flagellomere, lateral. 8: Fourth flagellomere, lateral. 9: Subanal plate, ventral. 10: Genitalia, ventral. Scales for 5 and 10, 0.05 mm; for 6–9 0.025 mm. Arrows refer to characters described in the diagnoses.