Agmina triangulata, 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 triangulata sp. nov. Figs 195-200

Diagnosis.

Agmina triangulata sp. nov. resembles A. comata Ward, 2003 in the genitalia, particularly, in lateral view, the triangular shape of the superior appendages, and the presence of a cluster of mesally orientated setae on the median face of the superior appendages; the curving sternal processes and inferior appendages. Agmina triangulata sp. nov. is distinguished from A. comata in that the superior appendages are slightly more strongly produced posteriorly, the wider sternal process in lateral view, the much shorter dorsally curving branch of the inferior appendage in lateral view, and the more widely round shape of the inferior appendage in ventral view.

Etymology.

Triangulata, from Latin, meaning triangular. Referring to the shape of the superior appendages in lateral view.

Material examined.

Holotype: New Caledonia - Province Sud • ♂; Dumbea River, Branche Nord, 2.2 km SE summit of Mt. Piditéré; 22°07.503'S, 166°29.899'E; 25 m; 21.i.2004; light trap; loc#124; leg. KA Johanson & C Pöllabauer; MNHN.

Measurements.

Fore wing length 3.9 mm (N = 1). Total length of genitalia: 0.6 mm.

Description.

Genitalia: In lateral view, segment IX almost triangular, apex located at mid-height of genitalia; in ventral view widely oval. Sternal processes, lateral view, with sharply triangular, longer than high; in ventral view, slender, with almost uniformly concave inner margin, apex slightly curving mesally. Tergum X triangular in lateral view, slightly longer than high; in dorsal view, almost tangential mesally at narrow apices, posteriorly convex and anteriorly concave margins; Parameres slender, starting below anterior end of tergum X, almost straight till mid-height of basis of superior appendage, bending strongly ventrally before fading into posteroventral margin; in dorsal view, separated along their length, orientated posterad, slightly narrowing, with mesal lobe with small setae present before superior appendage, fusing with superior appendage and with long row of short megasetae. Superior appendages, in lateral view, sharply triangular, longer than high; in dorsal view basally narrow, expanding mesally at mid-length; apex pointing mesally; lateral margins nearly straight. Inferior appendages, in lateral view, with basal part almost rectangular, posteroventral margin parallel with posteroventral margin of sternal process, posterior corner expanded into finger-like, dorsally curved process not reaching as far posterior as apex of sternal process; in ventral view large, oval, with deep central posterior V-shaped incision; lateral processes orientated posterad and slightly mesally curving. Phallus, in lateral view sub-straight, slightly longer than superior appendage; in ventral view almost uniformly wide along its length.

Additional information.

This species was referred to as "sp. 14" in Espeland and Johanson (2010a).

Figures

Figures 195 - 200. Agmina triangulata sp. nov. male holotype 195 genitalia, left lateral view 196 superior appendage, left lateral view of mesal surface 197 genitalia, dorsal view 198 genitalia, ventral view 199 phallus, lateral view 200 phallus, ventral view.