Dineura sharkeyi Smith, 2011

Smith, David R., 2011, Nematinae (Hymenoptera, Tenthredinidae) of Thailand, with notes on some other southeastern Asian nematines, Journal of Hymenoptera Research 22, pp. 1-27 : 6-7

Dineura sharkeyi Smith sp. n. Figs 4-7

Description.

Female. Length, 4.5 mm. Head black with clypeus brown and mouthparts white. Thorax black with posterior angles or pronotum and tegulae white; small orange-brown spot on central posterior margin of mesepisternum. Legs white with femora light orange. Abdomen brown, lighter than thorax, with narrow posterior margin of segments white; sheath black; 9th tergite, cercus, and apical sternite orange brown. Wings hyaline; veins and stigma brown with extreme bases of veins white.

Head and thorax shiny, with fine white pubescence; abdomen shiny with very fine microsculpture on tergites. Antennal length (apical antennomere missing) about 2.1 × head width; 3rd antennomere subequal in length to 4th antennomere. Clypeus circularly emarginated, emargination about half medial length of clypeus. Malar space about 1.5 × diameter of front ocellus. Postocellar area 3.6 × broader than long. Left mandible evenly tapering from base to apex. Distance between eye and lateral ocellus about 1.2 × distance between lateral ocelli. Lower interocular distance 1.6 × eye height. In dorsal view, head rounded behind eyes, distance behind eyes about 0.8 × eye length. Forewing with 2A+3A straight; 2r present; crossvein 2r-m absent; intercostal crossvein basal to M. Hind basitarsomere subequal to length of following 3 tarsomeres combined. Tarsal claws simple. Tibial spurs short, inner spur about 0.4 × length of basitarsomere. Sheath simple ( Fig. 6 ), from above broad at base evenly tapering to acute apex; hairs straight. Cerci shorter than sheath in dorsal view. Lancet long, slender, well sclerotized, serrulae most evident on apical third; annuli with short, stout spines ( Fig. 7 ).

Male. Unknown.

Holotype.

Female labeled "Thailand, Soi Dao, 500-1850 m., sweep, UTM 1429610, Jan. 16, 2005, Sharkey" (QSBG).

Etymology.

The species is named for the collector, M. J. Sharkey, University of Kentucky.

Discussion.

This species is assigned to Dineura . It shares most characters with species of Dineura except for the simple tarsal claws and absence of vein 2r-m in the forewing: broad malar space, emarginated clypeus, forewing with vein 2r present, intercostal crossvein basal to vein M, and similarities of the sheath and lancet. All other species have the tarsal claw with long inner tooth. The lancet is almost identical to species in Pristiphora subgenus Sharliphora , previously known as the Pristiphora ambigua group. The lancets of the three Pristiphora ( Sharliphora ) species are illustrated by Wong (1969: Figs 1-6), and that of Pristiphora amphibola ( Förster) is the closest. However, Dineura sharkeyi shares most characters with Dineura and cannot be a Pristiphora .

Dineura sharkeyi differs from the two species known from China, Dineura blanki Wei and Dineura testaceipes (Klug) by the simple tarsal claws and long lancet with short annular spines. Other species of the genus have a long inner tooth on the tarsal claws and the lancet is shorter and broader and usually with long annular teeth on the central segments ( Wei 2002b, Schmidt and Walter 1995).

Figures

Figures 4 - 7. Dineura sharkeyi, holotype 4 Lateral view; line points to vein 2 r 5 Dorsal view 6 Apex of abdomen and sheath, dorsal view 7 Lancet.