Agmina circulata, 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 circulata sp. nov. Figs 36-40

Diagnosis.

Agmina circulata sp. nov. is distinguished from the other Agmina species in the genitalia by the presence of a pair of inferior appendages having a ventral part that, in lateral view, almost reaches as far posteriorly as the sternal processes, and with the apex of the sternal processes and inferior appendages that are separated by a rectangular incision. It resembles A. sagittata sp. nov. in the overall similarity in the genitalia, but A. circulata sp. nov. is smaller than A. sagittata sp. nov., and in the genitalia A. sagittata sp. nov. has superior appendages that are more rounded in lateral view, shorter sternal processes in relation to the inferior appendages, and the sternal processes of A. sagittata sp. nov. is slightly wider and straighter than those of A. circulata sp. nov.

Etymology.

Circulata from Latin, meaning rounded. Named for the parameres forming a circular loop at the apex.

Material examined.

Holotype: New Caledonia - Province Sud • ♂; W part of Plaine des lacs, 150 m downstream bridge at La Capture; 22°15.967'S, 166°49.493'E; 261 m; 4-22.xi.2003; Malaise trap; loc#007; leg. KA Johanson; MNHN.

Paratype: New Caledonia - Province Nord • 1 ♂; same data as for holotype, except NHRS.

Measurements.

Fore wing length 4.6 mm (N = 1). Total length of genitalia: 0.5 mm.

Description.

Genitalia: In lateral view, segment IX narrowly bell-shaped anteriorly, apex located medially; in ventral view anteriorly concave lens-shaped with slightly rounded lateral margins. Sternal processes, lateral view, with each apex exceeding the length of tergum X and almost superior appendage, elongated narrowly triangular with acute apex, dorsal margin relatively straight, ventral margin gently concave; in ventral view, longer than inferior appendage, narrowing along their length, apex semi-acute, outer margin slightly rounded, inner margin straight. Tergum X in lateral view semi-triangular with concave anterior margin, dorsal margin with central bump, longer than superior appendage, longer than wide; in dorsal view, mesally separate, golf club shaped, inner margins forming shallow triangle. Parameres starting before tergum X, in lateral view long, slowly widening along 2/3 of its length, then narrow, apex forming ring, ending before apex of superior appendage; in dorsal view, separated, long, slender, straight, apex forming ring. Superior appendages, in lateral view, shorter than tergum X, irregularly rounded; in dorsal view stout, slightly curving inwards, with rounded outer margin and gently lobed inner margin, apex directed mesad with claw like process directed posteromesad. Inferior appendages, in lateral view, with posterad orientated short, rounded dorsal branch; ventral branch spine like, gently curving dorsad, almost reaching length of sternal process; in ventral view narrowly rounded base, slightly diverging along its length towards triangular apex. Phallus, in lateral view shorter than segment IX, tubular; in ventral view tubular with rounded anterior end.

Additional information.

This species was referred to as "sp. 19" in Espeland and Johanson (2010a).

Figures

Figures 36 - 40. Agmina circulata sp. nov. male holotype 36 genitalia, left lateral view 37 genitalia, dorsal view 38 genitalia, ventral view 39 phallus, lateral view 40 phallus, ventral view.