Oxyethira (Trichoglene) rectangulata, 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 : 5

Oxyethira (Trichoglene) rectangulata sp. nov.

urn:lsid:zoobank.org:act:C930EB33-5E37-49C2-8A94-882E97EAF988

Fig. 2A–D

Diagnosis

Oxyethira (Trichoglene) rectangulata sp. nov. belongs to the group of Oxyethira spinifera . It is similar to O. tiwaka Wells & Johanson, 2015 by the quadrangular shape of segment IX in ventral view, and in lateral view by the inferior appendages being divided into a dorsal part forming a hump and a ventral part forming a pointed projection. This species can be recognized by the rectangular shape of the inferior appendages in dorsal and ventral views, which are totally fused, bearing two pairs of small setae on the inner face (in O. tiwaka these appendages are much smaller and the ventral part forms a quadrate-shaped sclerotized projection in ventral view); by the shape of the subgenital process in lateral view, which is thinner and almost straight in O. rectangulata sp. nov., and thicker, C-shaped in O. tiwaka .

Etymology

ʻ Rectangulata ʼ, from Latin, ʻrectangularʼ, refers to the shape of the inferior appendages in dorsal and ventral 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 2 ♂♂; same collection data as for holotype; NHRS .

Description

BODY. Male antennae with 20 flagellomeres. Forewing length 1.7–1.8 mm (n = 3); tibial spurs 0, 3, 4; forewings with venation typical for subgenus. Abdominal sternite VII with a small, pointed mesoventral process.

MALE GENITALIA ( Fig. 2A–D ). Abdominal segment VIII cylindrical with wide, V-shaped incision in ventral view ( Fig. 2C ). Abdominal segment IX inserted within segment VIII; anterior margin slightly concave, not surpassing anterior margin of segment VIII ( Fig. 2B–C ). Segment X not visible. Subgenital processes almost straight in dorsal ( Fig. 2B ) and ventral views ( Fig. 2C ), each bearing one bilobed process at base. Inferior appendages fused, rectangular in dorsal ( Fig. 2B ) and ventral views ( Fig. 2C ), bearing two pairs of small mesal setae at inner margin visible in dorsal view ( Fig. 2B ); divided into two parts in lateral view ( Fig. 2A ): dorsal part forming a truncate hump, ventral part forming pointed projection. Setal lobes absent. Aedeagus elongate, with slender apical spine curved left in dorsal view. Ejaculatory duct extending freely at apex. Titillator absent ( Fig. 2D ).

Figures

Fig. 2. Oxyethira (Trichoglene) rectangulata sp. nov., male genitalia. A. Lateral. B. Dorsal. C. Ventral. D. Aedeagus, dorsal. Scale bars = 0.1 mm.