Cassidoides rainensis, 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 : 64

Cassidoides rainensis sp. nov.

urn:lsid:zoobank.org:act:261A047E-B4F8-4780-BD17-451BB5F40503

Fig. 15A‒B

Diagnosis

Morphology

Cassidoides rainensis sp. nov. differs from congeneric species in a combination of male terminalia characters, as follows ( Fig. 15B ). The aedeagal apodeme is markedly longer than the gonocoxae (↓ 1), the tegmen is inversely U- rather than V-shaped (↓ 2), and the long, apically hooked gonocoxal processes run parallel and in close proximity to the tegmen (↓ 3). Larvae and females of the new species are unknown.

DNA barcode

The CO1 sequence (654bp) of the holotype specimen is available in BIN BOLD:ACY6187. Search on BOLD’s BIN Database retrieved a further match for this BIN, as Diptera sp. from Mecklenburg-Vorpommern, Germany (accessed 26 Aug. 2023).

Differential diagnosis

Cassidoides rainensis sp. nov. resembles C. fulvus (Kieffer, 1896) , a widespread Holarctic species, in the shape of the gonostylus and the length of the aedeagal apodeme. However, in C. fulvus the apex of the aedeagal apodeme is pointed, not spoon-shaped; the tegmen resembles an inverse V rather than U; and the gonocoxal processes, which are situated at some distance from the tegmen, are evenly bent dorsolaterad ( Jaschhof & Jaschhof 2013: fig. 145b).

Etymology

The name is derived from the type locality, Rain, a small town in Lower Bavaria.

Type material

Holotype

GERMANY • ♂; Bavaria, Lower Bavaria , Rain ; 48°64′61″ N, 11°01′89″ E; elev. 429 m; 15 Jul. 2019; LandKlif and J. Müller leg.; Malaise trap; BOLD GBDTA10247-21 ; ZSM-DIP-42306-G10.

Other characters

Male

BODY LENGTH. 1.8 mm.

HEAD. Eye bridge dorsally 1‒2 ommatidia long. Antenna as long as body; scape and pedicel brighter than flagellum; 12 flagellomeres; apical flagellomere long, composed of two nodes; circumfila present on all flagellomeres, irregularly sinuous; neck of fourth flagellomere 1.7× as long as node ( Fig. 15A ). Palpus 4-segmented, markedly shorter than head height.

WING. As long as body. Length /width ratio 2.6. M 4 missing, CuA ending well before wing margin.

LEGS. Acropods, to assess structure of claws and empodia, lost.

TERMINALIA ( Fig. 15B ). Gonocoxal synsclerite broader than long, with dense setae of very different lengths ventrally; ventral emargination faintly contoured, apparently U-shaped. Gonostylus upright, twice as long as thick; outside with numerous setae of various lengths; inside slightly excavated, sparsely setose incl. 2‒3 long subapical bristles; pectinate claw of moderate size. Apex of aedeagal apodeme membranous rather than sclerotized. Tegminal apex bent slightly dorsad, blunt-ended with minor indentation.

Figures

Fig. 15. A‒B. Cassidoides rainensis sp. nov., holotype, ♂ (ZSM-DIP-42306-G10). A. Fourth flagellomere, lateral view. B. Terminalia, ventral view. – C‒E. C. riparius sp. nov., holotype, ♂ (ZSM- DIP-42307-B10). C. Fourth flagellomere, lateral view. D. Terminalia, ventral view. E. Gonostylus, ventral view. Scale lines: A‒C = 0.05 mm; D‒E = 0.025 mm. The numbered arrows indicate diagnostic characters (see text).