Tetraneuromyia lapponica, Jaschhof & Jaschhof, 2019

Jaschhof, Mathias & Jaschhof, Catrin, 2019, New Dicerurini from Europe, mostly Sweden (Diptera: Cecidomyiidae, Porricondylinae), Zootaxa 4559 (2), pp. 245-264 : 260-262

Tetraneuromyia lapponica sp. nov.

Figs 36–38, 40

Diagnosis. Tetraneuromyia lapponica belongs to a subgroup of Tetraneuromyia with distinct gonocoxal processes bordering a small, U-shaped emargination ( Fig. 38 , ↓ 6); the other species belonging here are T. lenticularis , T. moldaviensis ( Spungis, 1987) , and T. wilksae . Each of these species has a distinctive tegmen, which in T. lapponica is structured as follows. The apex is made of two long, pointed processes, whose orientation is to the posterior end but with a slight bend to the ventral side; the process bases are blunt-ended, somewhat elongated and slightly bent ventrally ( Fig. 40 , ↓ 7); and the central trunk has a conspicuous, ovoid sclerotization dorsally ( Fig. 40 , ↓ 8). Female and larva of T. lapponica are unknown.

Other male characters. Body size 1.3–1.5 mm. Head. Eye bridge 1 ommatidium long dorsally. Scape and pedicel concolorous with flagellum. Neck of fourth flagellomere 1.9–2.1 times as long as node ( Fig. 36 ). Circumfila occasionally with posterior extensions of varying lengths. Thorax. Anepisternum asetose. Wing. 3.1 times longer than wide. M 1+2 absent. Setae on the anterobasal portion of membrane very sparse. Genitalia. Posterior edge of ninth tergite deeply emarginated ( Fig. 38 ). Gonocoxae: ventral setae confined to lateral portions; gonocoxal processes long, narrow; dorsal apodemes angled posteriorly, with massive anterior processes ( Fig. 38 ). Gonostylus slightly bent inwards, tapered towards apex, dorsoventrally compressed on apical half; 2–3 long, subapical bristles, 1 on ventral side, 1–2 on dorsal side ( Fig. 37 ). Parameral apodemes very large ( Fig. 40 ). Ejaculatory apodeme with subbasal thickening, slightly tapered towards apex ( Fig. 38 ).

Etymology. The species name, lapponica , is derived from Lapponia, the Latin name for Lapland, where the types of this species were collected.

Type material. Holotype. Male , Sweden, Lule Lappmark, Sorsele, 8 km N Ammarnäs, 520 m above sea level, herb-rich subalpine birch forest, 12 August 2016, aspirator, M. Jaschhof (spm. no. CEC 1513 in NHRS).

Paratypes. 1 male, same data as the holotype (spm. no. CEC 1514 in NHRS) ; 1 male, Sorsele , Bissitjbäcken 6 km N Ammarnäs, 490 m above sea level, mixed forest of pine, spruce and birch with blueberry, 23 July–15 August 2016, MT, MCJ (spm. no. CEC 1515 in SDEI) .

Figures

FIGURES 32–40. Tetraneuromyia brevipalpis, male, holotype. 32: Genitalia, ventral. 33: Tegmen, ventral. 34: Fourth flagellomere, lateral. Tetraneuromyia discrepans, male, holotype. 35: Fourth flagellomere, lateral. 39: Genitalia, ventral. Tetraneuromyia lapponica, males. 36: Fourth flagellomere, lateral, holotype. 37: Gonostylus, dorsal, paratype. 38: Genitalia, ventral, holotype. 40: Tegmen, ventral, holotype. Scales 0.05 mm. Arrows refer to characters described in the diagnosis.