Cassidoides riparius Jaschhof, 2024, sp. nov.

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.