Cassidoides riparius, 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 : 65-66

Cassidoides riparius sp. nov.

urn:lsid:zoobank.org:act:1FDC3219-DA56-426D-BA25-4749179C9D63

Fig. 15C‒E

Diagnosis

Morphology

Cassidoides riparius sp. nov. is one of the smallest species known of the genus. The male is barely 1.3 mm long and its terminalia are of tiny dimensions ( Fig. 15D ). A terminalia structure peculiar to this species relates to the gonocoxal processes, which each consist of a broad, presumably flattened portion basally that transitions into a thick, tusk-shaped portion apically (↓ 4, Fig. 15D ). Larvae and females of the new species are unknown.

DNA barcode

The CO1 sequence (653bp) of the holotype specimen is available in BIN BOLD:AER0232. Search on BOLD’s BIN Database retrieved no further result for this BIN (accessed 26 Aug. 2023).

Etymology

The Latin adjective ‘ riparius ’ means ‘living on the riverbank’, an allusion to the habitat in which the holotype specimen was collected.

Type material

Holotype

GERMANY • ♂; Bavaria, Moos, Isar estuary; 48°78′60″ N, 12°95′94″ E; elev. 313 m; 29 Jul.‒12 Aug. 2021; GBOL and R. Albrecht leg.; Malaise trap; hardwood floodplain forest; BOLD GBDTA10282-21 ; ZSM-DIP-42307-B10 .

Other characters

Male

HEAD. Eye bridge dorsally 1‒2 ommatidia long. Antenna shorter than 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 1.1× as long as node ( Fig. 15C ). Palpus 4-segmented, nearly as long as head height.

WING. Slightly longer than body. Length /width ratio 2.7. M 4 extremely faint, CuA ending well before wing margin.

LEGS. Acropods, to assess structure of claws and empodia, not retained.

TERMINALIA ( Fig. 15D ). Gonocoxal synsclerite broader than long, with dense setae of very different lengths ventrally; ventral emargination faintly contoured, apparently U-shaped. Gonostylus compact, 1.5 × as long as thick; outside with numerous setae of various lengths; inside slightly excavated, sparsely setose incl. 2‒3 long subapical bristles; pectinate claw broad, slightly undulated ( Fig. 15E ). Aedeagal apodeme about as long as gonocoxae, its sclerotized portion narrowed apically and covered by membranous cap. Tegmen: shaped like inverted V, apex bent slightly dorsad, blunt with small 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).