Rhipidoxylomyia bilobata, Jaschhof, 2024

Jaschhof, Mathias, 2024, New taxa and new records of Winnertziinae and Porricondylinae (Diptera: Cecidomyiidae) from Germany, European Journal of Taxonomy 953, pp. 1-134 : 9-11

Rhipidoxylomyia bilobata sp. nov.

urn:lsid:zoobank.org:act:4A6111F6-495E-4025-92D3-A9EE9D2DCBC6

Fig. 2

Diagnosis

A typical representative of the genus, this species belongs to a subset in which T 1 bears a slender microtrichose process (in distinction from a true spine, characterized by a pointed apex and absence of microtrichia). Rhipidoxylomyia bilobata sp. nov. is distinguished by the male ninth tergite, whose emargination extends halfway down the tergiteʼs total length (↓ 1, Fig. 2A ), and thus is deeper than in any other species of the genus. The tegmen has the shape of an equilateral triangle (↓ 2, Fig. 2A ), which, on condition that this outline is stable, is a further peculiarity of this species. Rhipidoxylomyia bilobata is known from a single male; larvae and females are unknown.

Etymology

The Latin adjective ‘ bilobata ’ means ‘bilobate’, describing the structure of the male ninth tergite.

Type material

Holotype

GERMANY • ♂; Bavaria, Lower Franconia, Bobingen ; 48°27′18″ N, 10°84′03″ E; elev. 524 m; 16 Jul. 2019; LandKlif and J. Müller leg.; Malaise trap; ZSM-DIP-42310-E05 .

Other characters

Male

BODY LENGTH. 1.9 mm.

HEAD. Eye bridge dorsally 3‒4 ommatidia long. Antenna markedly shorter than body; scape and pedicel slightly darker than flagellum; 11 flagellomeres, necks somewhat brighter than nodes; translucent sensilla on flagellomeres 1‒9, two per flagellomere, either simple, bi- or trifurcate. Neck of fourth flagellomere 0.8× length of node, node slender, twice as long as broad ( Fig. 2B ). Palpus shorter than head height, 4-segmented, fourth segment as long as second and third segments combined.

THORAX. Pronotal setae 7. Mediotergal lateral microtrichia of normal size. Parascutellar area bright, clearly contoured by dark margin.

WING. Markedly shorter than body. Length / width ratio 2.3. Costal cell reinforced. M 4 weak, nearly straight, CuA gently bent, both veins declining before wing margin.

LEGS. Scales pointed. Fore tibia 1.1 × length of T 2. Acropods: claws slightly bent, basal tooth large. Empodia ⅓ of claw length.

ABDOMEN. Pleural membrane devoid of setae.

TERMINALIA ( Fig. 2A ). Ninth tergite as long as gonocoxae, setae confined to posterior and lateral portions, anterior margin straight, indistinct. Gonocoxal synsclerite broader than long; ventral emargination very deep, U-shaped; a considerable portion ventrobasally glabrous; dorsoposterior portions protruding beyond ventroposterior portions; dorsal apodemes thin, slightly shorter than distance separating them. Gonostylus massive, subcylindrical, 2.3× as long as broad, broadly rounded apically. Tegminal flaps distinct, broad, slightly sclerotized; parameral apodemes small. Aedeagal apodeme gently narrowing beyond midlength, apex more strongly narrowed for a short distance. Aedeagal bulge with loose, irregular lines of tiny spikes.

Figures

Fig. 2. Rhipidoxylomyia bilobata sp. nov., holotype, ♂ (ZSM-DIP-42310-E05). A. Terminalia, ventral view. B. Fourth flagellomere, lateral view. Scale lines: 0.05 mm. The numbered arrows indicate diagnostic characters (see text).