Aprionus fujisanensis, Jaschhof & Jaschhof, 2017

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

Aprionus fujisanensis sp. nov.

urn:lsid:zoobank.org:act:29B60EC7-5128-4999-B0A5-CBCA93ACD794

Fig. 2

Diagnosis

A key character of Aprionus fujisanensis sp. nov. is the tegmen whose unusually narrow lateral pillars (↓, Fig. 2A ) 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. 2A ) and gonostyli with a narrow apex (↓, Fig. 2A ).

Etymology

The species epithet refers to Fuji-san, the Japanese name for Mount Fuji, the type locality.

Material examined

Holotype

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 ).

Paratypes

JAPAN: 2 ♂♂, same data as for holotype ( DEI, nos A 7636– A 7637).

Differential diagnosis

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. 2D ) 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. 2B ).

Other characters

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. 2B ). 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. 2D ).

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. 2C ). Gonocoxites ( Fig. 2A ): 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. 2A ). Tegmen slender, central opening inconspicuous, slit-like ( Fig. 2A ).

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.

Figures

Fig. 2. Aprionus fujisanensis sp. nov., holotype, ♂. A. Genitalia, ventral. B. Fourth flagellomere, lateral. C. Ninth tergite, dorsal. D. Posterior portion of wing. Scale lines: A–B = 0.05 mm; C = 0.025 mm; D = 0.50 mm. Arrows indicate diagnostic characters.