Oxyethira (Trichoglene) hamus, Cavalcante & Johanson, 2022

Cavalcante, Bruna Maria Silva & Johanson, Kjell Arne, 2022, Three new species of Oxyethira Eaton, 1873 (Trichoptera: Hydroptilidae) from New Caledonia, European Journal of Taxonomy 789, pp. 1-10 : 3

Oxyethira (Trichoglene) hamus sp. nov.

urn:lsid:zoobank.org:act:200E6D45-51B4-4012-A3B1-4FE519ED65F6

Fig. 1A–D

Diagnosis

This new species belongs to the group of Oxyethira caledoniensis . It is similar to O. houailou Wells & Johanson, 2015 by the presence of strong sclerotized margins of the inferior appendages, each one bearing one seta in the mesal region as seen in ventral view; and by the general shape of the phallus apex, with a subdistal spine curved to the left in dorsal view. Oxyethira (Trichoglene) hamus sp. nov. is recognized by the hook-shaped apex of the long inferior appendages in lateral view (short and with pointed apex in O. houailou ) and by the posterior margin of segment IX having a trilobed appearance in ventral view (forming a subtriangular projection in O. houailou ).

Etymology

ʻ Hamus ʼ, ʻhookʼ in Latin, refers to the shape of the inferior appendages in lateral view.

Material examined

Holotype NEW CALEDONIA • ♂; Province Sud Haute Yaté fauna reserve , 1760 m S of bridge Pont Perignon, 50 m upstream from bridge over stream; 22.14954° S, 166.701211° E; alt. 180 m; 14 Dec. 2003 – 13 Jan. 2004; K.A. Johanson leg.; Loc#081; Malaise trap; MNHN.

Paratypes

9 ♂♂; same collection data as for holotype; NHRS.

Description

BODY. Male antennae with 18 flagellomeres. Forewing length 1.4–1.8 mm (n = 10, mean 1.5 mm); tibial spurs 0,3,4; forewings with venation typical for subgenus. Abdominal sternite VII without mesoventral process.

MALE GENITALIA ( Fig. 1A–D ). Abdominal segment VIII almost cylindrical, with shallow incision at posterior margin in ventral view ( Fig. 1C ). Abdominal segment IX inserted within segment VIII; anterior margin forming three lobes in ventral view ( Fig. 1C ), surpassing anterior margin of segment VIII ( Fig. 1A–B ). Segment X not visible. Subgenital processes slightly curvilinear in dorsal view ( Fig. 1B ), each with pointed apex curved downward in lateral view and one bilobed process at base ( Fig. 1A ). Inferior appendages fused, with strongly sclerotized margins, bearing one pair of small mesal setae at posterior margin visible in dorsal ( Fig. 1B ) and ventral views ( Fig. 1C ), and one pair of small setae at inner margin visible in dorsal view ( Fig. 1B ); posterior margin slightly concave; in lateral view hook-shaped with apex curved backward and touching base of subgenital process ( Fig. 1A ). Setal lobes absent. Aedeagus elongate; in subdistal region, slender spine pointing left in dorsal view. Titillator absent ( Fig. 1D ).

Figures

Fig. 1. Oxyethira (Trichoglene) hamus sp. nov., male genitalia. A. Lateral. B. Dorsal. C. Ventral. D. Aedeagus, dorsal. Abbreviations: See Material and methods. Scale bars = 0.1 mm.