Enithares bosavi, Polhemus, 2020

Polhemus, Dan A., 2020, Nine new species of Enithares (Heteroptera: Notonectidae) from New Guinea, with distributional notes on other species and an updated world checklist, Zootaxa 4772 (1), pp. 132-182 : 154-156

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Enithares bosavi

new species

Enithares bosavi new species

( Figs. 3 View FIGURES 2–7 , 15 View FIGURES 9–15 , 19 View FIGURES 16–21 , 63 View FIGURE 63 )

Type material examined. Holotype, male (dissected): PAPUA NEW GUINEA, Southern Highlands Prov., small rocky stream in primary rainforest on N. slope of Mt. Bosavi , 1250 m., 06°32′43′′S, 142°50′23′′E, water temp. 19° C., 17 March 1995, 11:00–15:00 hrs., CL 7026, D. A. Polhemus ( BPBM). GoogleMaps

Description. Male: Length 11.20 mm, width across pronotum 4.40 mm.

Coloration: Ground color dark brown ( Fig. 15 View FIGURES 9–15 ). Vertex creamy white; frons light brown with a pale blue patch immediately above labrum and extending upward along inner margins of eyes. Pronotum with anterior third dark brown; central section with creamy white transverse fascia traversing area between pronotal foveae; posterior half black. Scutellum dark brownish-black, somewhat more embrowned on lateral angles. Hemelytra with clavus and corium greyish hyaline appearing darker due to dorsal color showing through; wing membrane dark fumate brown. Legs yellowish brown, anterior edges of fore tibia, middle femur and hind femur narrowly margined with dark brown. Venter brown, with coxal plates tan.

Structural characters: Head broadly rounded anteriorly when viewed dorsally. Head length 1.00; greatest width 3.50, equal to 0.79 pronotal width; anterior width of vertex 1.30, equal to 1.3× head length. Synthlipsis 0.85, about 0.65 anterior width of vertex and clearly shorter than pronotum. Pronotal length along midline 1.30, humeral width 4.40, lateral margins convex, posterior margin weakly sinuate. Dorsal margin of pronotal fovea directed caudad behind eyes ( Fig. 15 View FIGURES 9–15 ). Nodal furrow curved weakly cephalad, removed by 2.0× its length from membranal suture, length 0.60, distance to membranal suture 1.20.

Front and hind legs typical for genus, lacking unusual modifications. Middle trochanter rounded. Middle femur with single large subapical tooth, bordered basally by about 12 small black pegs, distally by about six similar pegs. Hind femur strongly dorsoventrally flattened when viewed laterally. Lengths of leg segments as follows: fore femur–tibia–tarsal 1–tarsal 2 = 2.00/2.10/0.70/0.40; middle femur–tibia–tarsal 1–tarsal 2 = 2.80/2.20/0.90/0.50; hind femur–tibia–tarsal 1–tarsal 2 = 4.50/3.60/1.80/0.80.

Ventral abdomen with metaxyphus elongate triangular, slightly concave, tip acuminate ( Fig. 3 View FIGURES 2–7 ).

Male genitalia when viewed laterally ( Fig. 19 View FIGURES 16–21 ) with proctiger angular; pygophore with posteroventral angle forming nearly a right angle bearing a prominent setal tuft, posterior lobe broad and blunt, notched on dorsal margin, posteriorly setiferous; paramere elongate, apex rounded, exceeding dorsal margin of posterior process on pygophore; lateral arm of basal plate with distal section broadly curving, apex acute; aedeagus semicircular, with numerous transverse folds.

Female: Unknown.

Etymology. The name “bosavi” represents a noun in apposition, and refers to Mt. Bosavi, an isolated volcano lying south of the central mountain ranges in a remote area of Papua New Guinea.

Discussion. The genitalic morphology of E. bosavi is similar to that of E. stylata , which has a blunt, dorsally notched posterior lobe on the pygophore (PL), an elongate paramere with a rounded apex, and tapered, curving lateral arms on the basal plate (LABP). However, the paramere in E. stylata is basically straight, versus gently curving anterad as in E. bosavi , and the LABP is far more elongate, and slightly hooked at the apex (compare Figs. 19 View FIGURES 16–21 , 37 View FIGURES 35–40 ). Enithares stylata is also a larger species, with body lengths ranging from 11.75–13.00 mm, whereas the only known male of E. bosavi is 11.20 mm in length. Enithares bosavi is also similar to E. atra Brooks , which also possesses a blunt, dorsally notched (PL) and an elongate paramere with a rounded apex. The major difference between the two species lies in the shape of the LABP which is upwardly curving, tapering, and apically acute in E. bosavi , versus backwardly curving, distally expanded and apically truncate in E. atra (compare Figs. 17, 19 View FIGURES 16–21 ).

Ecological notes: Enithares bosavi has to date been taken only from first order, upper elevation streams on Mt. Bosavi , an isolated volcano south of the New Guinea central ranges ( Fig. 63 View FIGURE 63 ), lying in the Papuan Gulf Foreland area of freshwater endemism (Area 25) as defined by D. Polhemus & Allen (2007). The type locality was a small, rocky, heavily shaded headwater stream with cold, clear water, dropping along a moderate but steady gradient through undisturbed montane rain forest. The bed substate consisted of large, mossy rocks, with cobbles and gravel in the intervening runs. The single type specimen of E. bosavi was taken from a flowing pool near the stream’s headwaters .













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