Lebinthus nattawa, Robillard, 2009

Robillard, Tony, 2009, Eneopterinae crickets (Insecta, Orthoptera, Grylloidea) from Vanuatu, Zoosystema 31 (3), pp. 577-618 : 605-608

Lebinthus nattawa n. sp.

( Figs 1G, H ; 3D ; 6H ; 10 D-F; 11B; 12D-F; 13; 19)

TYPE MATERIAL. — Vanuatu. [Province Sanma], Espiritu Santo Is., Nattawa, forêt pâturée, 15°19’29’’S, 167°12’09’’E, 29.X.2006, jour, litière, adulte en captivité (TR-413), T. Robillard, ♂ holotype ( MNHN- ENSIF2556). — Same locality, date and collector as holotype, jour, litière (TR-414), ♀ allotype ( MNHN- ENSIF2557).

Paratypes (2 ♂♂; 5 ♀♀): same locality, date and collector as holotype, jour: 2 ♂♂ (TR-412, 418), 2 ♀♀ (TR- 417, 419), litière (MNHN-ENSIF2558-2561) ; 1 ♀ (TR-420), litière sous feuilles mortes; 1 ♀ (TR-411), litière, photo SH; 1 ♀ (TR-415), litière, adulte en captivité, PIII: molec TR 2008 (MNHN-ENSIF2562-2564).

TYPE LOCALITY. — Vanuatu, Espiritu Santo Is., Nattawa.

ETYMOLOGY. — Species named after the type locality.

OTHER MATERIAL EXAMINED. — Vanuatu. Province Sanma, Espiritu Santo Is., Nattawa, forêt pâturée, 15°19’29’’S, 167°12’09’’E, 29.X.2006, jour (TR-416), litière, T. Robillard, 1 ♀ juv. (MNHN-ENSIF2565).

DISTRIBUTION. — Vanuatu, Espiritu Santo Is.

DIAGNOSIS. — Species of small size, close to L. santoensis n. sp. and L. lifouensis from which it differs by male genitalia and female copulatory papilla, wider and of more stocky shape (pronotum wider), and colouration dark brown dorsally and darker ventrally, with same dark apical ring on cerci.

DESCRIPTION

Species of small size, shape wider and more stocky than in L. santoensis n. sp. Colouration most often dark brown dorsally and darker ventrally ( Figs 13 ; 19B, C ). Head dorsum with 6 more or less visible dark brown longitudinal bands, sometimes with almost completely brown head dorsum, with faint band patterns still visible. Eyes light brown dorsally, dark brown to black ventrally, the dorsal margin with a dark brown area, thinner or absent in L. santoensis n. sp. Fastigium brown, wider than long and setose, apex whitish with a dark spot behind median ocellus. Scapes light brown, antennae homogeneously brown. Face almost entirely black, except a median yellow line on fastigium. Mouth parts dark brown to black. Palpi light brown, banded with black. Pronotum: Dorsal disk trapezoidal, wider posteriorly than in L. santoensis n. sp.; posterior margin straight; light brown with dark spots arranged in uneven lines; lateral lobes of pronotum almost entirely black, with a partial whitish band near ventral third, ventral margin whitish. Legs: colouration as in L. santoensis n. sp., but generally darker. Hind tibiae dorsal face with 4 or 5 inner (m = 5, n = 8) and 7 or 8 outer (m = 7, n = 8) spines above spurs, and 4 or 5 inner (m = 5, n = 8) and 5 outer (m = 5, n = 8) spines between spurs. Tarsomeres III-1 with 3-5 (m = 4, n = 8) spines on dorso-external edges. Hind wings absent, FWs short. Abdomen wide, brown with a black band on each lateral side; each tergite with dark spots on posterior margin. Cerci light brown, entirely banded, including a preapical black ring, as in L. santoensis n. sp.

Male

FW not reaching abdomen midlength ( Fig.13 ). FW colouration ( Fig. 1G, H ): dorsal field homogeneously dark brown, except MP/MA area greyish; lateral field brown, MA/R area dark brown; veins slightly lighter than cells. FW venation similar to L. santoensis n. sp.: 1A angle wide (>130°); stridulatory file with 149 teeth (n = 1), located on both transverse part (117 teeth) and angle (32 teeth) of 1A ( Fig. 3D ). CuP missing. Harp as wide as long, with one harp vein parallel to transverse axis. CuA curved internally at apex, the median fold triangular and short, located on dorsum. Cell c1 wider than in L. santoensis n. sp., separated at midlength by an accessory vein, c2 large. Mirror triangular, without accessory vein and larger than in L. santoensis n. sp.; d2 thin and rectangular. Apical field almost absent, including only 2 cells behind mirror (E alignment). Lateral field with 6 strong longitudinal veins including MA, R and 4 more ventral veins; latero-dorsal angle made by MP; R without strong bifurcations.

Male genitalia ( Fig. 10 D-F): very similar to L. lifouensis , but pseudepiphallic sclerite wider, rounded laterally, its anterior edge bisinuate, very indented medially; lophi setose, thinner than in L. santoensis n. sp. Pseudepiphallic parameres large, trilobate. Ectophallic arc complete and wide, immediately anterior to pseudepiphallic parameres. Ectophallic fold short and wide, with a Y preapical sclerotization. Endophallic sclerite Y-shaped, shorter than in L. santoensis n. sp., not reaching beyond anterior margin of pseudepiphallic sclerite; endophallic apodeme made of a thin median crest.

Female

FW dark brown, shorter than in L. santoensis n. sp., not reaching beyond posterior margin of first tergite, separated by a distance equal to length ( Fig. 11B ); dorsal field with 4 or 5 strong longitudinal veins. Lateral field with 3 or 4 strong longitudinal veins. Ovipositor short; apex lanceolate, denticulate on dorsal edge ( Fig. 6H ).

Female genitalia: copulatory papilla ( Fig. 12 D-F) widened dorsally, more elongate than in L. santoensis n. sp., its basal sclerotized ring irregular; apex narrowed and long, curved ventrally, with a preapical ventral bump.

Juvenile

Subadults similar to adults in colouration. Measurements

See Table 13.

HABITAT AND LIFE HISTORY TRAITS

Lebinthus nattawa n. sp. lives in leaf litter in forested areas ( Fig. 19 ). Specimens are found in dense populations in wet leaf litter, generally on or under large dead leaves.

BEHAVIOUR

Not documented.

Figures

FIG. 1. — Male FW venation in dorsal and lateral views:A, B, Cardiodactylus enkraussi Otte,2007;C, D, C. tankara n. sp.; E, F, Lebinthus santoensis n. sp.; G, H, L. nattawa n. sp. Abbreviations: see Material and methods. Scale bars: 1 mm.

FIG. 3. — SEM view of stridulatory file: A, Cardiodactylus tankara n. sp.; B, Lebinthus santoensis n. sp.; C, C. enkraussi Otte, 2007; D, L. nattawa n. sp. Photos: S. Hugel. Scale bars: 100 μm.

FIG. 6. — Apex of ovipositor in lateral view: A, Cardiodactylus enkraussi Otte, 2007; B, C. tankara n. sp.; C, C. pentecotensis n. sp.; D, C. aobaensis n. sp.; E, C. cheesmani Otte, 2007a; F, C. epiensis n. sp.; G, Lebinthus santoensis n. sp.; H, L. nattawa n. sp.; I, L. malekulensis n. sp. Scale bar: 1 mm.

FIG. 10. — Male genitalia: A-C, Lebinthus santoensis n. sp., in dorsal (A), ventral (B) and lateral (C) views; D-F, L. nattawa n. sp., in dorsal (D), ventral (E) and lateral (F) views. Abbreviations: see Material and methods. Scale bar: 1 mm.

FIG. 13. — Lebinthus nattawa n. sp., male habitus, holotype. Scale bar: 5 mm.

FIG. 19.— Lebinthus nattawa n. sp.:A, habitat,B, female;C, male,in Nattawa,Espiritu Santo,Vanuatu,by day,pastured forest.Photos: T. Robillard (A, TR-114) and S. Hugel (B, C, SH-29x06a).

FIG. 11. — Female FW venation: A, Lebinthus santoensis n. sp.; B, L.nattawa n. sp.;C, L.malekulensis n.sp. Dotted areas represent patterns of white or yellow areas.Abbreviations:see Material and methods. Scale bar: 5 mm.

FIG. 12. — Female copulatory papilla in ventral, dorsal and lateral views: A-C, Lebinthus santoensis n. sp.; D-F, L. nattawa n. sp.; G-I, L. malekulensis n. sp. Scale bar: 0.5 mm.