Aprionus ymiri,

Jaschhof, Mathias & Jaschhof, Catrin, 2017, New species of Aprionus (Diptera, Cecidomyiidae, Micromyinae) from Sweden and other parts of the Palearctic region, European Journal of Taxonomy 378, pp. 1-38: 29-31

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Aprionus ymiri

sp. nov.

Aprionus ymiri  sp. nov.


Fig. 17View Fig


The male genitalic structures of Aprionus ymiri  sp. nov. are as simple as characteristic of this species. The gonostylus is composed of two portions of the same size, a slightly convex portion basally and a flat portion apically; the gonostylar apex is narrowly rounded and provided with ordinary setae and setulae, no teeth or bristles (↓, Fig. 17BView Fig). The tegmen, which is tapered from the midlength to the narrowly rounded apex, is provided with 2 pairs of small, weakly contoured fingers, which do not intersect medially due to their rearward orientation (↓, Fig. 17AView Fig). A ventral plate is not apparent in this species.


Ymir is the ancestor of all jotunn, a mythological race commonly  glossed as the giants.

Material examined


SWEDEN: ♂, Öland , Borgholm, Skepparsäng Nature Reserve, 57.31° N, 17.04° E, dry pine forest, Malaise trap, M. and C. Jaschhof leg., 11 Jun.–21 Jul. 2015 ( NHRS, no. CEC288).



FINLAND: ♂, Karelia borealis, Lieksa, Patvinsuo NP, 63.08° N, 30.37° E, mature spruce forest with birch and aspen trees, MT, MCJ leg., 12 Jun.–7 Jul. 2004 ( DEI, no. CEC 289).

Differential diagnosis

Aprionus ymiri  sp. nov. lacks characters that, seen individually, would catch the observer’s attention, but the combination of characters as described above is species-specific. To avoid misidentification, this rarely found species should be compared with both Aprionus dispar Mamaev, 1963  and A. pseudispar Jaschhof, 1997  (see Jaschhof 1998: figs 151, 155), two much more common species.

Other characters

Body size 1.1 mm.

HEAD. Postfrons setose. Eye bridge 2–3 ommatidia long dorsally. Postocular bristles: 10 in holotype, 7 in paratype. Neck of fourth flagellomere shorter than node, thick, simply hair-shaped translucent sensilla ( Fig. 17CView Fig). Palpus short, 3-segmented in holotype, 2-segmented (but equally long) in paratype, basal segment somewhat swollen.

WING. ApicR 1 2.5–3.0 times as long as Rs.

LEGS. Claws sickle-shaped, toothless. Empodia rudimentary.

TERMINALIA ( Fig. 17AView Fig). Ninth tergite subrectangular, anterior margin fully sclerotized, concave medially. Gonocoxites slightly pointed ventroposteriorly, dorsal bridge small, subtriangular, extends far beyond ventroanterior gonocoxal margin.

Distribution and phenology

Sweden (Öland), Finland (Karelia borealis). Adults were collected in June–July in various types of forest.

Aprionus  incertae sedis

This category gathers Aprionus  , 12 described in the past and three described here, that cannot be classified in any of the species groups recognized so far ( Jaschhof 1998; Jaschhof & Jaschhof 2009). We think that the number of ‘unplaceables’ will not increase with more species being found and described in the future; rather we expect that the affinities of these species to other Aprionus  will be illuminated and the intrageneric structure of Aprionus  improved with ongoing study (see the differential diagnoses of Aprionus bestlae  sp. nov. and A. borri  sp. nov.).


Mus. Tinro, Vladyvostok


Missouri Southern State College


Senckenberg Deutsches Entomologisches Institut