Dicerura penttineni Jaschhof & Spungis, 2018

Jaschhof, Mathias & Spungis, Voldemars, 2018, Towards reliable identification of male Dicerura: descriptions of three new and seven poorly known species in the Palearctic region (Diptera: Cecidomyiidae, Porricondylinae), Zootaxa 4422 (1), pp. 85-103 : 89

Dicerura penttineni Jaschhof & Spungis sp. nov.

Figs 3–5

Diagnosis. The gonostylus of D. penttineni , another species of the iridis group, is narrowly rounded apically,

bulbous medially, and provided with a small, subglobular lobe mediobasally that is covered with dense, conspicuously large microtrichia, a few setulae and 2–3 short bristles ( Fig. 3 , ↓1). Of the gonocoxites, the ventral emargination is conspicuously shallow and angular-shaped ( Fig. 3 , ↓2) and the two pairs of processes on either side

of the emargination are same size. The cap-like apex of the tegmen, which is pointed, has a single pair of small barbs laterally ( Fig. 5 , ↓3). The apical fork of the ejaculatory apodeme is one fourth as long as the apodeme’s total

length ( Fig. 5 ). The ninth tergite is strongly tapered towards the apex, which is bilobed and covered densely in short, thick microtrichia ( Fig. 4 , ↓4). The genitalia of D. penttineni closely resemble that of D. triangularis , a

species differing in that the gonostylar lobe is flat and angular, the dorsolateral pair of gonocoxal processes is

larger, and the ventral gonocoxal emargination is rounded ( Jaschhof & Jaschhof 2013: fig. 59).

Other male characters. Body length 3.3 mm. Head. Eye bridge 4–5 ommatidia long dorsally. Antenna

slightly longer than body; scape and pedicel lighter than flagellum. Circumfila with 1 rather short extension. Neck

of fourth flagellomere 1.8 times longer than node. Palpus 4-segmented, as long as head height. Thorax. Scutum

with dark stripes dorsally and laterally. Anepisternum with 5–6 setae. Wing as long as body, with brownish tinge.

M1+2 reduced to short remnant apically. Legs. Empodia rudimentary. Claws slightly bent, 4 basal teeth gradually

decreasing in size. Genitalia. Ninth tergite: setae of various lengths dispersed over entire surface; anterior edge

straight, faintly contoured ( Fig. 4 ). Gonocoxites sparsely setose ventrally; dorsal portions protruding, slightly

angular-shaped posteriorly; dorsal apodemes moderately long ( Fig. 3 ). Gonostylus twice longer than broad, apex

slightly curved, lateral setae larger than medial setae ( Fig. 3 ). Ejaculatory apodeme slightly thickened on basal half

( Fig. 3 ).

Etymology. This species is named after the Finnish biologist Jouni Penttinen (Kuopio, Finland), who, earlier

in the present century, worked on the taxonomy and faunistics of Finnish Porricondylinae . As a lasting proof of his

talent and enthusiasm as a taxonomist, he left a rich collection of well-prepared specimens, which includes several

new, yet unnamed species.

Type material. Holotype. Male , Finland, Kuusamo, Kuohusuo-Kalliovaara 30 km S Kuusamo, mixed forest of

spruce and birch trees, 31 July–2 August 2004, sweepnet, M. Jaschhof (in MZH). Paratypes. 2 males, same data as

for the holotype (specimen no. A 7774 in SDEI, the other (without no.) in MZH).

Figures

FIGURES 3–5. Dicerura penttineni, male, holotype. 3: Genitalia, ventral. 4: Ninth tergite, dorsal. 5: Tegmen and ejaculatory apodeme, ventral. Scales 0.05 mm. Arrows refer to characters described in the diagnosis.