Caledomina dorsospina, Johanson, 2017

Johanson, Kjell Arne, 2017, Description of three new species of Caledomina (Insecta, Trichoptera, Ecnomidae) from New Caledonia, European Journal of Taxonomy 352, pp. 1-12 : 4

Caledomina dorsospina sp. nov.

urn:lsid:zoobank.org:act:147FDE5A-A7A6-4422-B30F-363F5BFAFBE5

Figs 6–10 , 16–17 , 19

GS8 Caledomina sp. 3 – Espeland & Johanson 2010: 2116.

Diagnosis

Caledomina dorsospina is distinguished from other species in the genus by the absence of a prominent sternal process of sternite IX, the dorsal branch of the superior appendages is oriented dorsally, and the ventral branch of the superior appendages is drop-shaped.

Etymology

Dorsospina, after the presence of a prominent dorsally oriented megaseta on each superior appendage.

Type material

Holotype

NEW CALEDONIA: ♂, Province Sud, 1.0 km NW of Pont des Japonais , on road between Noumea and Yaté, 22°11.421' S, 166°42.840' E, 114 m, loc #038, Malaise trap, 22 Nov.–4 Dec. 2003, Johanson leg. ( MNHN, DNA voucher: NHRS-GS8 ).

Description

WINGS. Fore wing length 3.0 mm, hind wing length 2.3 mm.

GENITALIA. Total length about 0.6 mm. Segment IX divided into pair of strong, antero-dorsally pointed ridges in lateral view ( Fig. 6 ); sternite IX originating from anterior ridge below mid-height; anteriorly membranous, gradually more sclerotized posteriorly, posteriorly forming pair of nearly rectangular plates without postero-dorsal sternal process ( Fig. 6 ); with ventral and lateral setae. Tergite IX almost U-shaped in lateral view ( Fig. 6 ), anterodorsal corners strongly curving anterad and strongly pointed at apex; with long, strong setae in lateral row; in dorsal view ( Fig. 7 ) with anterior-most part fused mesally; posterior part fused into superior appendages. Tergite X not visible ( Fig. 6 ). Superior appendages very large; each divided into posterior dorsal and ventral lobes ( Fig. 6 ), with setae basally of bifurcation ( Figs 6–7 ). Dorsal lobes each with pair of very large megasetae, one at each apex and one sub-apically; mesal, finger-like branches present ventrally of megasetae, with sharp setae at each apex ( Figs 6–7 ). Ventral lobes large, oval, oriented posterad, each with lateral face covered by large setae; mesal face with straight spines oriented mesally; ventral margin with minute setae; ventral branch strongly exceeding dorsal lobe posteriorly ( Fig. 6 ). Inferior appendages completely fused into small, mesal process, connected to central part of sternite IX by well defined sclerotized ridges; dorsal margin smoothly sigmoid; ventral margin convex; apex long, narrow in lateral view ( Fig. 6 ); in ventral view ( Fig. 8 ) with broad basis; narrowing stepwise, apex smooth, bifurcated. Phallic apparatus without processes ( Figs 9–10 ); tubeshaped; posterior two-thirds about twice as thick as anterior part in lateral view ( Fig. 9 ); posterior apex membranous, with minute setae at dorsal membrane.

Remarks

This species was referred to as “GS8 Caledomina sp. 3” in Espeland & Johanson (2010).

Figures

Figs 6–10. Caledomina dorsospina sp. nov., holotype, adult ♂. 6. Genitalia, lateral view. 7. Genitalia dorsal view. 8. Genitalia, ventral view. 9. Phallus, lateral view. 10. Phallus ventral view. Scale bar = 0.1 mm.

Fig. 16. Map of New Caledonia with collecting sites of Caledomina indicated. Caledomina paniensis sp. nov. (black square), C. dorsospina sp. nov. (black triangle), C. kohensis sp. nov. (black filled circle), C. noumea Johanson, 2011 (red stars).

Figs 17–18. Type localities with Malaise traps. 17. Type locality of Caledomina dorsospina sp. nov. 18. Type locality of Caledomina kohensis sp. nov.

Fig. 19. Phylogenetic relationship among species of Caledomina, with morphology of male genitalia in lateral view to the right.