Oxyethira (Trichoglene) spiralis, 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 : 7

Oxyethira (Trichoglene) spiralis sp. nov.

urn:lsid:zoobank.org:act:5027693E-FC66-4256-B619-34C77CA3E6FF

Fig. 3A–D

Diagnosis

Based on general similarities, Oxyethira (Trichoglene) spiralis sp. nov. is tentatively placed in the group of Oxyethira caledoniensis . It is similar to O. caledoniensis Kelley, 1989 by the shape of segment IX in ventral and lateral views, with the anterior margin only slightly produced anteriorly and by the shape of the apparently fused inferior appendages. In O. caledoniensis the inferior appendages are widely separated and form bilobed sclerotized structures that are absent in O. spiralis sp. nov. The new species can be recognized in lateral view by the subquadrate shape of the inferior appendages, by the strongly curvilinear shape of the subgenital process in dorsal and lateral views, and by the long process spiralling around the ejaculatory duct at the phallus apex.

Etymology

ʻ Spiralis ʼ, from Latin, ʻspiralʼ, referring to the shape of the long process present around the ejaculatory duct in this species.

Material examined

Holotype NEW CALEDONIA • ♂; Province Nord, Western slope of Kugüö Mt, Xwé Wida Di Stream, 2 km E of Koh; 21°35.474′ S, 165°50.776′ E; alt. 154 m; 20 Nov.–12 Dec. 2003; K.A. Johanson leg.; Loc#036; Malaise trap; MNHN.

Description

BODY. Male antennae with 22 flagellomeres. Forewing length 1.7 mm (n = 1); tibial spurs 0, 2, 4; forewings with venation typical for subgenus. Abdominal sternite VII with a small, pointed mesoventral process.

MALE GENITALIA ( Fig. 3A–D ). Abdominal segment VIII cylindrical without excisions. Abdominal segment IX inserted in segment VIII; anterior margin slightly produced anteriorly ( Fig. 3A–B ). Segment X not visible. Subgenital processes with strongly sigmoid shape in dorsal ( Fig. 3B ) and ventral views ( Fig. 3C ), each bearing one bilobed process at base. Inferior appendages fused and almost quadrate in lateral view ( Fig. 3A ). Setal lobes absent. Aedeagus elongate, long process spiralling around ejaculatory duct; ejaculatory duct extending freely in middle of two weakly sclerotized projections at phallus apex. Titillator absent ( Fig. 3D ).

Figures

Fig. 3. Oxyethira (Trichoglene) spiralis sp. nov., male genitalia. A. Lateral. B. Dorsal. C. Ventral. D. Aedeagus, dorsal. Scale bars = 0.1 mm.