Dicerura scirpicola Kieffer, 1898

Jaschhof, Mathias, 2024, New taxa and new records of Winnertziinae and Porricondylinae (Diptera: Cecidomyiidae) from Germany, European Journal of Taxonomy 953, pp. 1-134 : 54-55

Dicerura scirpicola Kieffer, 1898

Fig. 12

Dicerura scirpicola , the type species of the genus Dicerura , was discovered more than 120 years ago in France ( Kieffer 1898). Kiefferʼs syntypes are lost and the species had not been recognized since, so our understanding of it was previously limited to information provided in the original description. With the find of a single male in a Malaise trap sample from Bavaria, D. scirpicola may now be regarded as rediscovered. Its identification was made possible by Kieffer’s illustration of the male terminalia ( Kieffer 1899: fig. 2), which shows two structures diagnostic of this species: the large, characteristically shaped gonostylus and the large, furcate apex of the aedeagal apodeme.

Revised diagnosis

Morphology

The unusually long gonostylus is slightly bent, tapered towards the apex, and slightly bulged basally, which together makes for an unmistakable outline ( Fig. 12A ). The linkage between gonostylus and gonocoxa is peculiar for its two joints, the usual one laterally and an additional one dorsally (↓ 1, Fig. 12B ). The gonocoxal synsclerite has two pairs of setose processes on either side of the ventral emargination (↓ 2, Fig. 12A ); the aedeagal apodeme ends in a furca of considerable size (Fig. C); the tegmen, whose lateral and posterior margins are concave, has clusters of barb-like knobs apicolaterally (↓ 3, Fig. 12C ); and the bilobed posterior portion of the ninth tergite is covered in dense, large microtrichia (↓ 4, Fig. 12B ).

DNA barcode

The CO1 sequence (651bp) of the specimen listed below is available in BIN BOLD:AEI1289. Search on BOLD’s BIN Database retrieved a further six matches for this BIN, as Cecidomyiidae sp. from Norway (accessed 26 Aug. 2023).

Material examined

GERMANY ‒ Bavaria • 1 ♂; Upper Palatinate, Bodenwöhr, Postlohe , Sattelbogenweiher ; 49°26′86″ N, 12°37′88″ E; elev. 382 m; 25 Jun.‒13 Jul. 2016; D. Doczkal and J. Voith leg.; Malaise trap; pond edge; BOLD GBDTA10118-21 ; ZSM-DIP-42305-D12 .

Distribution

Germany (new record); France ( Gagné & Jaschhof 2021).

Figures

Fig. 12. Dicerura scirpicola Kieffer, 1898, ♂ (ZSM-DIP-42305-D12). A. Terminalia, ventral view. B. Gonocoxae and ninth tergite, dorsal view. C. Parameres and apex of aedeagal apodeme, ventral view. Scale lines: 0.05 mm. The numbered arrows indicate diagnostic characters (see text).