Xanthochorema neocaledonia, Johanson, 2002

Johanson, Kjell Arne, 2002, A new species of the New Caledonian endemic genus Xanthochorema Kimmins, 1953 (Insecta: Trichoptera: Hydrobiosidae), Zootaxa 42, pp. 1-6 : 2

Xanthochorema neocaledonia sp.n.

( Figs 1­6 , 13 )

Material examined: Male holotype: NEW CALEDONIA: Prov. Sud, Sarraméa , 207 m., stream near waterfall, 21°36.981'S, 165°51.154'E, Malaise trap, 18­21.xi.2001 [Johanson, Pape & Viklund] . Paratype (1 male): ditto, except 130 m, large, stony stream, 21°38.291'S, 165°51.562'E, 3­5.xii.2001 .

Etymology: neocaledonia derived from New Caledonia.

Diagnosis. In genitalia, the parapod is deeply bifurcated and forms a pointed, dorsal branch which is oriented dorsad; and a pointed, ventral branch which is oriented posteroventrad; the coxopodite is broad along its length, and at posterodorsal corner strongly produced posterodorsad.

Description.

Fore wing: 7.1 mm; hind wing: 6.0 mm. Spurs 0, 4, 4.

Abdominal segment with internal gland situated in posterior part of segment IV and anterior part of segment V, connected to lateral filament on segment V ( Fig. 1 ). Filament nearly twice the length of segment V; arising anteroventrally on segment V, oriented posteroventrad, tuboid along its length, narrowing towards apex; distal half with dorsal microtrichia and ventral teeth ( Fig. 1 ). Segment VI with sternal process arising medially on segment; exceeds segment VI; slightly posteriorly curved; covered by ventral microtrichia ( Fig. 1 ); in ventral view ( Fig. 2 ), slightly tapered toward truncated apex.

Genitalia ( Figs 3­6 ): Segment IX, lateral view ( Fig. 3 ), parallelogram­shaped, with slightly convex anterior margin; in dorsal view ( Fig. 4 ), with inner margin widely ellipsoid; in ventral view ( Fig. 5 ), posterior margin shallowly produced medially, anterior margin concave; longitudinal apodeme only visible in ventral view ( Fig. 5 ). Proctiger, lateral view ( Fig. 3 ), substraight, broad, apically obtuse, apical margin undulated, dorsal margin incised at proximal part, opposite to lateral process of proctiger; in dorsal view ( Fig. 4 ) substraight, with parallel lateral margins, apically incised. Lateral process of proctiger ( Fig. 3 ) slender, nearly as long as the height of proctiger, oriented posterodorsad. Filopod, lateral view ( Fig. 3 ), slightly curved dorsad, about 3.7x longer than lateral process of proctiger, dorsal margin covered by very long setae, ventral margin with shorter setae; in dorsal view curved mesad along its length ( Fig. 4 ). Preanal appendage ( Fig. 3 ), short, slightly club­shaped, covered by short setae, parallel with basal part of filopod. Parapod ( Fig. 3 ), deeply bifurcated, dorsal fork slightly curved dorsad, with smooth margins, apically pointed; in dorsal view apically strongly curved laterad; ventral fork oriented posteroventrad, apically sigmoid, proximally with ventral swelling ( Fig. 3 ). Gonocoxite: coxopodite, lateral view ( Fig. 3 ), very broad along its length, with subparallel dorsal and ventral margins; dorsodistally strongly produced into long, pointed process, covered by short setae on both lateral and median face; harpago proximally thick compared to central part, apically club­shaped, smooth; in ventral view ( Fig. 5 ), coxopodite median margin proximally expanded, tapered medially toward slender distal half, apically obtuse; harpago long, slender, curved mediad along its length. Phallus in lateral view ( Fig. 6 ), sigmoid, generally broad along its length, except constricted at two thirds its length; aedeagus, long, slender, distal part slightly curved dorsad; sperm channel slender proximally, expanded strongly in medial part of phallus; endotheca forms simple lobe with internal, darkly sclerotized process.

Figures

FIGURES 1 ­ 6. Xanthochorema neocaledonia sp. n., male. 1, Abdominal segments IV­VI, lateral view; 2, sternal process of abdominal segment VI, ventral view; 3, Genitalia, lateral view; 4, Genitalia, dorsal view; 5, Genitalia, ventral view; 6, Phallus, lateral view.

FIGURES 7 ­ 13. Maps indicating distributions of New Caledonian Hydrobiosidae, based on published and new records. 7, Apsilochorema caledonicum Schmid, 1989; 8, Xanthochorema bifurcatum Schmid, 1989; 9, Xanthochorema calcaratum Schmid, 1989; 10, Xanthochorema caledon Kimmins, 1953; 11, Xanthochorema celadon Schmid, 1989; 12, Xanthochorema paniensis Ward & Mary, 2000; 13, Xanthochorema neocaledonia sp. n.