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: 5-6
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Aprionus fujisanensis sp. nov.
Fig. 2View Fig
A key character of Aprionus fujisanensis sp. nov. is the tegmen whose unusually narrow lateral pillars (↓, Fig. 2AView Fig) form a perfect, inverted V basally, then run parallel to each other for quite a distance to end in membranous hooks. This conspicuous outline occurs in combination with small ventroposterior gonocoxal lobes (↓, Fig. 2AView Fig) and gonostyli with a narrow apex (↓, Fig. 2AView Fig).
The species epithet refers to Fuji-san, the Japanese name for Mount Fuji, the type locality.
JAPAN: ♂, Honshu, Yamanashi, Oyama, east slope of Mount Fuji , 1900 m a.s.l., mature mixed coniferous forest, Malaise trap, M. and C. Jaschhof leg., 4–13 Jun. 1999 ( KUEC, no. A7635).
JAPAN: 2 ♂♂, same data as for holotype ( DEI, nos A 7636– A 7637).
Male genitalia in Aprionus fujisanensis sp. nov. and A. longitegminis Yukawa, 1967 are generally similar, but the latter has a slightly different tegmen and the ninth tergite is shorter ( Jaschhof & Jaschhof 2009: figs 74A, 76D). The strongly recurved CuA present in A. fujisanensis sp. nov. (↓, Fig. 2DView Fig) is shared with both A. longitegminis and A. brevitegminis Jaschhof, 2009 , but not with other members of the angulatus group. Throughout this group, antennal translucent sensilla tend to branch, but this is most pronounced in A. fujisanensis sp. nov. (↓, Fig. 2BView Fig).
Body size 1.4 mm. HEAD. Eye bridge 2–3 ommatidia long dorsally. A sparse row of 6–7 postocular bristles. Neck of fourth flagellomere as long as node or slightly longer; translucent sensilla usually branched, rarely simply hairshaped ( Fig. 2BView Fig). Palpus with 3 segments, first segment swollen, apical segment longest of all.
WING. ApicR 1 3.0–3.5 times as long as Rs. CuA reaches wing margin ( Fig. 2DView Fig).
LEGS. Claws sickle-shaped, toothless. Empodia half as long as claws.
TERMINALIA. Ninth tergite long, posterior margin almost straight, posterolateral shoulders slightly apparent, anterior margin fully sclerotized ( Fig. 2CView Fig). Gonocoxites ( Fig. 2AView Fig): ventrobasal apodeme poorly sclerotized, especially anteriorly; medial extensions of gonocoxal apodemes weakly sclerotized, not interconnected medially. Gonostylus blunt-ended, 1+1 short bristles among dense setulae and microtrichia apically, dorsoapical and ventrobasal portions same size ( Fig. 2AView Fig). Tegmen slender, central opening inconspicuous, slit-like ( Fig. 2AView Fig).
Distribution and phenology
This species is known from a small series of specimens collected in early June on Japan’s highest mountain peak, Mount Fuji.
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