Agmina digitata, 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 digitata sp. nov. Figs 41-45

Diagnosis.

Agmina digitata sp. nov. is distinguished from the other Agmina species by the combination of a pair of long, straight sternal processes that form almost a right angle with the anterior margin of segment IX in lateral view; the apex almost reaching the posterior terminal part of the superior appendages; inferior appendages well hidden behind the sternal processes in lateral view; and the superior appendages in lateral view being rhomboid and slightly produced dorsally at the posterior end. It resembles A. cunicula sp. nov. in the shape of the genitalia in lateral view, but A. digitata sp. nov. can be separated from A. cunicula sp. nov. by the shape and larger size of the superior appendages.

Etymology.

Digitata, from Latin, meaning digit-like. Named for the shape of the apex of the superior appendage in dorsal view, which is toe-shaped.

Material examined.

Holotype: New Caledonia - Province Nord • ♂; 50 m upstream bridge on Hienghène-Tnèdo road, 3.9 km S summit of Mt. Tnèda, 2.2 km E Tnèdo; 20°43.085'S, 164°49.928'E; 29 m; 7.xii.2003; light trap; loc#071a; leg. KA Johanson; MNHN.

Measurements.

Fore wing length 4.0 mm (N = 1). Total length of genitalia: 0.7 mm.

Description.

Genitalia: In lateral view, segment IX triangular anteriorly, apex located medially; in ventral view, anteriorly widely U-shaped. Sternal processes, lateral view, with each apex exceeding the length of tergum X and almost superior appendage, long, slender, dorsal margin with widely triangular notch before mid-length, then straight, ventral margin slightly concave, apex acute; in ventral view, almost twice as long as inferior appendage, long, slender, straight, slightly widening at club shaped, acute apex. Tergum X in lateral view approx. same length as superior appendage, irregularly triangular; in dorsal view, mesally separate, irregularly quadrilateral, rounded antero-mesally, inner margins forming U. Parameres starting before tergum X, in lateral view slender, with two thin whip-like processes at apex almost forming a ring, barely reaching superior appendage; in dorsal view, anteriorly separated, straight, posterior half fused to complex structure, apex with central lobe and truncate lateral branches ending at base of superior appendage. Superior appendages, in lateral view, axe-blade shaped with dorsal margin slightly concave, as long as tergum X; in dorsal view stout, curving inwards, with rounded outer margin and irregular inner margin, apex finger-like, directed mesoposterad. Inferior appendages, in lateral view, with posterad orientated, small, widely triangular dorsal branch; ventral branch narrowly triangular, apex acute; in ventral view rounded at base, margins almost parallel, posterior margin concave with spine-like central process. Phallus, in lateral view shorter than segment IX, tubular; in ventral view tubular, anterior end with rounded lateral lobes, posterior end convex with spine-like lateral processes.

Additional information.

This species was referred to as "sp. 50" in Espeland and Johanson (2010a).

Figures

Figures 41 - 45. Agmina digitata sp. nov. male holotype 41 genitalia, left lateral view 42 genitalia, dorsal view 43 genitalia, ventral view 44 phallus, lateral view 45 phallus, ventral view.