Agmina dathioensis, Espeland & Sjöberg & Johanson, 2020

Espeland, Marianne, Sjoeberg, Tin & Johanson, Kjell Arne, 2020, Description of 47 new species of the New Caledonian endemic caddisfly genus Agmina Ward & Schefter (Trichoptera, Ecnomidae), ZooKeys 956, pp. 49-162 : 49

Agmina dathioensis sp. nov. Figs 120-124

Diagnosis.

Agmina dathioensis sp. nov. is characterised by having long posteriorly orientated sternal processes that are almost parallel-sided along their length. Also A. rostrata sp. nov., A. rougensis sp. nov., and A. lata sp. nov. have long and parallel-sided sternal processes in lateral view. Agmina dathioensis sp. nov. is distinguished from all these species by not having heavily sclerotised parameres. Agmina dathioensis sp. nov. is furthermore distinguished from A. rostrata sp. nov. and A. lata sp. nov. in that the sternal processes are orientated ventrally, not posteriorly, and from A. lata sp. nov. in the slightly narrower sternal processes in lateral view, and absence of megasetae on the posterior apex of the parameres on the mesal face of the superior appendages. Finally, A. dathioensis sp. nov. can be distinguished from A. rougensis sp. nov. by the narrower sternal processes in lateral view.

Etymology.

Dathioensis, named for the Dathio River, the type locality of the species.

Material examined.

Holotype: New Caledonia - Province Sud • ♂; Xwé Pemöu Stream, 300 m N bridge over Dathio River at Atè, 6.2 km WNW of Thio; 21.58835S, 166.15117E; 13 m; 29.xi.2003; light trap; loc#056; leg. KA Johanson; MNHN.

Measurements.

Fore wing length 3.9 mm (N = 1). Total length of genitalia: 0.5 mm.

Description.

Genitalia: In lateral view, segment IX sharply triangular anteriorly, apex located medially; in ventral view anteriorly ovoid. Sternal processes, lateral view, with each apex almost reaching apex of superior appendage, slightly wider anteriorly, curving downwards, apex blunt forming three small lobes; in ventral view, long, robust, parallel, of equal with along their length, apex acute directed posteriorly. Tergum X in lateral view trapezoid, shorter than superior appendage, in dorsal view, mesally fused with wide bridge, wide rounded lobe, inner margin forming very shallow U. Parameres starting at tergum X, in lateral view complex folded structure with truncated apex exceeding dorsal margin of superior appendage; in dorsal view, slender, hardly discernible structure. Superior appendages, in lateral view, irregularly quadrilateral, apex, wide, truncated, almost twice the length of tergum X; in dorsal view relatively long, slender, slightly curving mesad, narrowing along its length, long acute apex sharply curving mesad. Inferior appendages, in lateral view, with dorsoanterad orientated dorsal branch, initially wider, then tapering towards apex, ventral branch with wide, club-shaped apex, both branches exceeding dorsal margin of sternal process, main structure exceeding ventral margin of superior appendage; in ventral view relatively short, with convex lateral margins, ventral branch forming two broad posterior processes with blunt apices. Phallus, in lateral view shorter than segment IX, almost straight; in ventral view irregular, with long, narrow lateral processes at posterior end.

Additional information.

This species was referred to as "sp. 32" in Espeland and Johanson (2010a).

Figures

Figures 120 - 124. Agmina dathioensis sp. nov. male holotype 120 genitalia, left lateral view 121 genitalia, dorsal view 122 genitalia, ventral view 123 phallus, lateral view 124 phallus, ventral view.