Enithares rinjani, Chen & Nieser & Lansbury, 2008

Chen, Ping-ping, Nieser, Nico & Lansbury, Ivor, 2008, Notes on aquatic and semiaquatic bugs (Hemiptera: Heteroptera: Nepomorpha, Gerromorpha) from Malesia with description of three new species, Acta Entomologica Musei Nationalis Pragae 48 (2), pp. 269-279 : 273-274

Enithares rinjani sp. nov.

( Figs. 10-13 )

Type locality. Indonesia, Nusa Tenggara Province, Lombok Island, Mt. Rinjani, Senaru.

Type material. HOLOTYPE: J, ‘ INDONESIA: N Lombok / Mt. Rinjani: Senaru / waterfall alt. M 0470 / 21.x.1991 / Krikken, Huijbregts, de Vries // multistr evergr forest / (remnant) / rivulets from waterfall’ ( RMNH). Unique specimen, lacking left fore tibia and tarsus.

Description. Medium sized with greatest width at humeral angles of pronotum.

Dimensions (all in mm). Length 10.55, humeral width of pronotum 4.10, width of head 3.22, anterior width of vertex 0.89, synthlipsis 0.55.

Colour. Vertex pale yellowish, eyes castaneous. Pronotum pale yellowish with anterior third medium brown; pronotal fovea brown. Scutellum dark brown, posterior two fifths pale yellowish. Hemelytra anteriorly pale yellowish and posteriorly dark brown to blackish. Pro- and metasternum yellowish, mesosternum mostly brown. Abdominal ventrites II-V and anterior half of ventrite VI blackish, posterior half of ventrite VI and ventrites VII and VIII yellowish; median keel and connexiva yellowish, hair fringes black.

Structural characteristics. In dorsal view, anterior margin of vertex very slightly protruding in front of eyes. Median length of head half its width (1.58 / 3.22); somewhat less than twice the anterior width of vertex (1.58 / 0.89) and slightly longer than median length of pronotum (1.58 / 1.27). Pronotum: humeral width 3.2 times its median length (4.10 / 1.27), lateral margins divergent posteriorly, hind margin gently sinuate; prothoracal fovea well visible in dorsal view, its dorsal margins diverging behind eyes, its ventral margin in lateral view anteriorly rounded. Hemelytra: embolium in ventral view only slightly expanded anteriorly; nodal furrow nearly straight, its distance to membranous suture less than its length (0.30 / 0.56). Fore trochanter posteriorly rounded without ventral nodule; fore tibia and tarsus with dense pilosity and somewhat thickened, otherwise not modified. Middle trochanter and femur ventrally with extensive pilosity ( Fig. 12 ). Connexival segments I-III ventrally smooth. Metasternal xiphus ( Fig. 13 ) with apically convergent margins ending in narrow tip. Genital capsule ( Fig. 10 ): lateral arms of basal plate elongate with apical knob, parameres ( Fig. 11 ) elongate.

Female unknown.

Differential diagnosis. This species does not run well in the key by LANSBURY (1968); the options are E. bergrothi Montandon, 1892 , E. hebridensis Lansbury, 1968 , or E. rogersi Distant, 1911 . However, males of all the three species have much shorter and more or less plump parameres. Enithares lombokensis Lansbury, 1968 , with which this new species was collected together, has very small parameres, a genital capsule with bulky lateral arms of the basal plate, and in addition, its metaxiphus has lateroapical earlike extensions, appearing three pronged apically.

Etymology. Rinjani is a noun in apposition and refers to the type locality, Mount Rinjani, in northern Lombok.

Bionomics. The specimen has been found in a rivulet at the base of a waterfall.

Distribution. Indonesia, north of Lombok Island.

Figures

Figs. 7-13. 7-9 – Micronecta lumutensis sp. nov., J (paratype). 7 – prestigilar lobe; 8 – median lobe of abdominal sternite VII; 9 – left paramere, lateral view. 10-13 – Enithares rinjani sp. nov., J (holotype). 10 – genital capsule; 11 – right paramere, mesal view; 12 – trochanter and femur of middle leg, ventral view; 13 – metasternal xiphus.