Mecynostomella caledonia, Johanson, 2003

Johanson, Kjell Arne, 2003, Revision of the New Caledonian genus Mecynostomella (Trichoptera, Kokiriidae), Zootaxa 270 (1), pp. 1-24 : 12-14

Mecynostomella caledonia sp.n.

( Figs 28­35 , 53 )

Material examined: Male holotype: Trib. of Karionan River , 5 km NW Païta, 122 m (N54), 14.xi.1972 [W. L. & J. G. Peters] ( ROM, alcohol) . 1 male paratype: bank Grand Lakes , 20.viii.1965 [F. Starmühlner] ( NRM, alcohol) . 3 male paratypes: Riviére Bleue, at bridge on Eaux et Forêts road, 21 km NW Ouénarou Forest Station, 183 m (N51), 6­7.xi.1972 [W. L. & J. G. Peters] ( NRM, alcohol) . 1 female paratype: Province Sud, stream, Koghi Mt. , 22°10.327'S, 166°30.524'E, 522 m, Malaise trap, 12­16.xi.2001 [Johanson, Pape, Viklund] ( NRM, alcohol) . 3 male paratypes: Grand Lac , 3.i.1967 [F. Starmühlner] ( ROM, alcohol) . 5 male paratypes: Grand Lac W Cofimpac Camp , 250 m, 9.viii.1971 (#2) [J.D. Holloway] ( ROM, alcohol) . 1 male, 1 female paratype: Mt. Dzumac , 760 m, 22°02'S, 166°28'E, 27­ 28.ii.1984 [M. Pogue & M. Epstein] ( NMNH, pinned) . 1 male, 5 female paratypes: Riviére Bleue , 22°6'S, 166°39'E, 18.x.1986 [ R. Brown & O. Pellmyr] ( NMNH, pinned) . 1 female paratype: Mt. Koghi , 400 m, 12­14.xi.1986 [ R. Brown & O. Pellmyr] ( NMNH, pinned) . 9 male, 1 female paratypes: Mt. Koghi , 400 m, 12­14.xi.1986 [ R. Brown & O. Pellmyr] ( NMNH, alcohol) . 2 male, 1 female paratypes: Col de Mouirange , 225 m, 27.x.1986 [ R. Brown & O. Pellmyr] ( NMNH, alcohol) . 2 male paratypes: Riviére de Pirogue , 22°10'S, 166°42'E, 500 m, 7­9.ii.1984 [M. Pogue & M. Epstein] ( NMNH, alcohol) . 2 male paratypes: same, except ( NRM, pinned from NMNH) . 1 male, 4 female paratypes: Riviére Bleue , 166°40'E, 22°6'S, 8.xi.1986 [ R. Brown & O. Pellmyr] ( NMNH, alcohol) . 2 male paratypes: Riviére Bleue , 166°37.53'E, 22°5'S, 8.xi.1986 [ R. Brown & O. Pellmyr] ( NMNH, alcohol) . 1 male, 4 female paratypes: Riviére Bleue , 166°39.55'E, 22°6'S, 18.xi.1986 [ R. Brown & O. Pellmyr] ( NMNH, alcohol) .

Etymology: caledonia , derived from the type locality, New Caledonia. To be treated as a noun in genitive case.

Diagnosis: M. caledonia sp.n. lacks modified sensillae in the forewings as in brevis and spinosa . The species has a slender gonocoxite apex and a shallow, ellipsoidal incision on the posteroventral margin of segment IX.

Male ( Fig. 28­32 ).

Head: Frontal surface grey­brownish, frons covered by short, dark brownish setae; dorsal part divided into dark anterior and pale posterior half; few, long, golden brown setae present along eye margin and posterior margin of head. Flagellum with 44 flagellomeres.

Thorax: Pronotum dark yellowish­grey, with few dorsolateral, stout, dark brownish setae in distinct warts. Mesonotum dark brownish, with golden setae, setal warts absent.

Wings: Forewing length 6.9­9.5 mm (n=10), hind wing length 5.9­8.5 mm (n=10). Forewings greyish­black, hind wings grey. Venation as described for genus.

Genitalia ( Figs 28­32 ): Segment IX, lateral view ( Fig. 28 ), about 2.3x higher than long; anterior margin shallowly produced, slightly undulating; rounded dorsally; posterior margin bi­lobed, dorsal lobe small; ventral margin widely incised ( Fig. 30 ). Segment X with simple, central branch about parallel­sided at distal half in dorsal view ( Fig. 29 ); in lateral view ( Fig. 28 ), slender, about parallel­sided proximally, tapers distally; dorsal margin slightly bent ventrally at mid­length; with few setae on dorsolateral margin at distal half; more than 2x longer than high ( Fig. 28 ); apex narrowly rounded in lateral view, slightly incised in dorsal view ( Fig. 29 ). Lateral branch nearly as long as central branch, tubular, slightly curving ventrally along its length ( Fig. 28 ), apex slightly bent laterad in dorsal view ( Fig. 29 ), with short setae confined to apex, setae on proximal part form continuous band with setae on segment IX. Median lobe, lateral view ( Fig. 28 ), large, slightly longer than high, longer than lateral branches; with setae on ventral margin; in dorsal view ( Fig. 29 ) oriented posteriorly, visible between the central and lateral branches, pointed. Gonocoxite, lateral view ( Fig. 28 ), sub­straight along its length; dorsal margin sigmoid, ventral margin sub­straight, apex produced dorsally, slender sub­apical part about 0.6x as high as proximal part; in ventral view ( Fig. 30 ) oriented posteriad and with setae along its length. Phallus simple; phallobase, lateral view ( Fig. 31 ), length about three­quarts the height of segment IX; endothecae produced dorsally in dorsal opening, without spines; in ventral view ( Fig. 32 ) lateral incisions at proximal part located opposite to anterior margin of phallus opening.

Female ( Figs 33­35 ).

Wings: forewing length 9.6­10.9 mm (n=5), hind wing length 7.8­9.0 mm (n=5). Venation as in male, except fork 1 in forewing present, sessile.

Genitalia: Vagina without spines. Segments VIII and IX separate. Segment IX apparently without setae; in lateral view ( Fig. 33 ), dorsal process absent, ventral part produced posteriorly into lobe being slightly incised posteriorly and covered by small, marginal microtrichiae; in ventral view ( Fig. 35 ), dorsal margin of lobe with central V­shaped incision surrounded by microtrichiae; in lateral view, dorsal and ventral margins of lobe subparallel. Pair of dark microtrichiae­filled, sickle­shaped, multi­lobed cavity on ventral margin of transition between segments IX and X; in dorsal view ( Fig. 34 ), cavity visible through the segment, circular, with apices of outgrowths being distinctly darker. Segment X oriented ventrally; in lateral view ( Fig. 33 ) divided into wide proximal half, and narrow distal half, with sub­straight dorsal margin, slightly undulating ventral margin; in dorsal view ( Fig. 34 ), median processes curve medially, tapers apically, bears marginal microtrichiae; lateral processes oriented posteriorly.

Figures

FIGURES 28­32. Mecynostomella caledonia sp.n., male holotype. 28, genitalia, lateral view; 29, genitalia, dorsal view; 30, genitalia, ventral view; 31, phallus, lateral view; 32, phallus, ventral view.

FIGURES 33­35. Mecynostomella caledonia sp.n., female paratype. 33, genitalia, lateral view; 34, genitalia, dorsal view; 35, genitalia, ventral view.

FIGURES 53­54. Distribution maps of New Caledonian Mecynostomella. 53, caledonia (circles), hollowayi (rectangles), and sigma (triangle); 54, spinosa (circles), flinti (rectangle), brevis (triangles), and fusca (diamond).