Agmina rectangulata, 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 rectangulata sp. nov. Figs 89-93

Diagnosis.

The inferior appendages of A. rectangulata sp. nov. is unique from most other species in the genus due to being almost rectangular in ventral view; and a wide, with a convex ventral margin and presence of a posterodorsal and posteroventral process when viewed from the lateral side. The inferior appendages of Agmina diriwi Ward & Schefter, 2000, and A. hexacantha Ward, 2003 resemble those of A. rectangulata sp. nov. in lateral view, except lacking the posterodorsal processes, and in ventral view the shape of the appendages are different, i.e., the plate is produced posteriorly in A. rectangulata while excised in A. diriwi and A. hexacantha . Agmina rectangulata is morphologically closest to A. chela sp. nov. Agmina chela sp. nov. is distinguished from A. rectangulata sp. nov. by the inferior appendages having slightly larger posterodorsal process in lateral view; in ventral view, a more truncate posterior margin of inferior appendages. Furthermore, the superior appendage is clearly longer than in A. rectangulata sp. nov. in lateral view.

Etymology.

Rectangulata, from Latin, meaning rectangular. Named for the shape of the inferior appendages having an almost rectangular impression.

Material examined.

Holotype: New Caledonia - Province Sud • ♂; Plateau de Dogny; 846 m; 21°37.000'S, 165°52.500'E; loc#145 (15-2001); Malaise trap; 18-21.xi.2001; leg. KA Johanson, T Pape & B Viklund; MNHN.

Paratypes: New Caledonia - Province Sud • 1 ♂; same data as holotype, except NHRS; • 1 ♂; Mt. Rembai, River Xwê Be, upstream bridge on road Sarraméa-Koh; 21°33.877'S, 165°49.922'E; loc#157; Malaise trap; 9-19.x.2006; leg. KA Johanson & M Espeland; NHRS.

Measurements.

Fore wing length 4.0-4.3 mm (N = 3). Total length of genitalia: 0.5 mm.

Description.

Genitalia: In lateral view, segment IX triangular anteriorly, apex located medially; in ventral view anteriorly U-shaped. Sternal processes, lateral view, with each apex reaching apex of superior appendage, gently curving with convex dorsal margin and concave ventral margin, apex blunt; in ventral view, parallel, ventral margin convex, mesal margin straight, apex semi-acute. Tergum X in lateral view saddle-shaped, anteriorly narrowly triangular with acuminate apex, anterior margin concave, dorsal margin straight, approx. same length as superior appendage; in dorsal view, mesally fused, irregular quadrilateral, inner margin widely U-shaped. Parameres starting at base of tergum X, in lateral view wider at base, then slender, tubular, second half extremely wide sheet-like, curving laterally and ventrally, with apex below superior appendage; in dorsal view, separated, wider at base, then slender, tubular, wider, club-shaped apex with lateral spine. Superior appendages, in lateral view, nearly oblong with straighter anterior margin, similar in length to tergum X; in dorsal view converging, longer than wide, finger-shaped with rounded apex with claw-like spine directed anteromesad, two small triangular processes on mesal margin anteriorly of claw. Inferior appendages, in lateral view, with dorsoposterad orientated shorter, claw-shaped dorsal branch; ventral branch longer, strongly curving at base, then straight, orientated dorsad; in ventral view almost rectangular with oval anterior margin, posterior margin widely triangular with ventral process forming acuminate apex, dorsal processes barely exceeding posterior margin, apices rounded with triangular notch mesally, lateral margins slightly undulating. Phallus, in lateral view shorter than segment IX, dorsal margin straight, ventral margin concave; in ventral view tubular, slightly tapering towards apex, with triangular lateral lobes near anterior end.

Additional information.

This species was referred to as "sp. 45" in Espeland and Johanson (2010a).

Figures

Figures 89 - 93. Agmina rectangulata sp. nov. male holotype 89 genitalia, left lateral view 90 genitalia, dorsal view 91 genitalia, ventral view 92 phallus, lateral view 93 phallus, ventral view.