Description of 47 new species of the New Caledonian endemic caddisfly genus Agmina Ward & Schefter (Trichoptera, Ecnomidae) Author Espeland, Marianne Arthropoda Department, Zoological Research Museum Alexander Koenig, Bonn, Germany Author Sjoeberg, Tin Zoology Department, Swedish Museum of Natural History, Box 50007, 10405 Stockholm, Sweden Author Johanson, Kjell Arne Zoology Department, Swedish Museum of Natural History, Box 50007, 10405 Stockholm, Sweden https://orcid.org/0000-0002-1893-3429 kjell.arne.johanson@nrm.se text ZooKeys 2020 956 49 162 http://dx.doi.org/10.3897/zookeys.956.51592 journal article http://dx.doi.org/10.3897/zookeys.956.51592 1313-2970-956-49 9B9E6A85D8C94794AC84B4D1965C2015 DE73B9FFE81C556285DDAB038D9FF8CB Agmina semiovale sp. nov. Figs 6-9 Diagnosis. Agmina semiovale sp. nov. resembles many other Agmina species in having a large semi-oval shaped superior appendage in lateral view. The species is distinguished from the other species by the presence of very large parameres that partly exceeds the superior appendages dorsally as seen in lateral view, and in dorsal view forming an oval basis and two broad posterad branches. The genitalia are similar to those of A. tuberosa sp. nov. from which it is distinguished by the absence of a row of teeth-like megasetae on the mesal margin of each paramere. Figures 6-9. Agmina semiovale sp. nov. male holotype 6 genitalia, dorsal part in left lateral view 7 genitalia, dorsal view 8 phallus, lateral view 9 phallus, ventral view. Etymology. Semiovale , from Latin, meaning half oval, named for the shape of the superior appendage in lateral view. Material examined. Holotype : New Caledonia - Province Sud • ♂; stream crossing Noumea-Yate road immediately W of turnoff to Riviere Bleue Reserve; 22°10.191'S , 166°44.474'E ; 162 m; 22.xi-4.xii.2003; Malaise trap; loc#040; leg. KA Johanson; MNHN. Measurements. Fore wing length 3.6 mm ( N = 1). Total length of genitalia: 0.5 mm. Description. Genitalia : Segment IX damaged, with sternal processes missing. Tergum X sub-rectangular; in dorsal view, mesally separate, more than two times longer than wide. Parameres robust, starting before tergum X, in lateral view long, wide at base, first half narrowing towards apex, apical half slightly widening, ventral margin slightly concave; in dorsal view, fused at base, apical 2/3rds separated, each with truncated apex, lateral margins convex, mesal margins slightly concave. Superior appendages, in lateral view, longer than tergum X, longer than wide, narrowing along its length, dorsal margin straight, ventral margin convex, with posterad spine-like mesal process present on ventromesal margin not exceeding posteriorly the main branch; in dorsal view slightly narrowing towards apex, running almost parallel, almost straight with blunt apex slightly curving inwards. Mesal processes straight, orientated slightly mesally. Inferior appendages missing due to damage. Phallus, in lateral view approx. as long as segment IX, three times longer than wide; in ventral view proximal half tapering along its length, apical half straight and tapering at apex. Additional information. This species was referred to as "sp. 57" in Espeland and Johanson (2010a) .