Namtokocoris khlonglan Sites

Sites, Robert W. & Vitheepradit, And Akekawat, 2007, Namtokocoris Sites, a new genus of Naucoridae (Hemiptera: Heteroptera) in waterfalls of Indochina, with descriptions of six new species, Zootaxa 1588, pp. 1-29 : 19-21

Namtokocoris khlonglan Sites , NEW SPECIES

Figs. 3, 8, 10e, 11e, 12e, 13e, 14e

Descriptions

Macropterous male. See generic description; only additional details provided here. Holotype, length 8.38; maximum width 5.39. Paratypes (n = 4), length 8.30–8.71 (mean = 8.47); maximum width 5.23–5.39 (mean = 5.25). Overall coloration dorsally dark brown with yellowish-brown head, pronotum, and wide band at anterior end of embolium gradually narrowing to obsolescence beyond embolium; heavy dark punctation forming subtle, indistinct pattern on head and pronotum, heaviest near posterior margin of head and pronotum in middle 2/3 and posterior to transverse sulcus ( Fig. 10 e). Ventrally, medium brown; darker thin band laterally on meso-, metathorax, and abdomen; yellowish-brown on anteclypeus, lateral margins of prothorax, and exposed portion of hemelytra.

Head length 1.42, maximum width 3.24, synthlipsis at posteromesal corner 1.08, with four pairs of setal rosettes bordering inner margin of eyes, fifth pair further mesad and slightly ventrad to anterior margin. Antennal proportions 6:7:11:7. Pronotum broad, 2.8 x as wide as long, with scattered elongate, erect setae; length at midline 1.76; maximum width at posterolateral corners 5.00; posterolateral corners rounded, produced posteriorly ( Fig. 11 e). Scutellum dark reddish-brown, occasionally, heavily punctate, triangular with distinctly sinuate posterolateral margins, twice as wide as long, width 3.16, length 1.56, longitudinal protuberances each with line of erect setae. Claval commissure length 1.97. Embolium with anterolateral margin strongly curved basally ( Fig. 11 e), yellowish anterior band gradually narrowing posteriorly and becoming obsolete beyond posterior end, length 3.57 (chord measurement), maximum width 0.86. All coxae golden brown; trochanters and femora medium brown; fore tibia/tarsus dark brown; middle and hind tibia/tarsus medium brown. Leg measurements as follows: foreleg, femur 1.76, tibia 1.14, tarsus 0.30; middle leg, femur 1.86, tibia 1.40, tarsomeres 1–3 0.12, 0.26, 0.32; hind leg, femur 2.38, tibia 2.54, tarsomeres 1–3 0.30, 0.64, 0.74. Posterior margin of mediosternite III straight, IV concave, V strongly concave, VI concave, VII straight or slightly concave, VIII semicircular. Posterior margin of laterosternite V straight. Genital operculum with posterolateral margins straight, apex acuminate. Parameres symmetrical, mesal margins straight, oriented convergently, anteromesal corners sharply right-angled, distal margins straight to slightly concave, anterolateral corners rounded, larger than and extending beyond median process of pygophore, series of stout setae near apex, long setae in lateral half; median process of pygophore short, broad, apex rounded and with long hairs; aedeagus with mid-dorsal carina, with basal quarter narrow, rapidly widening to greatest width, above basal quarter left margin nearly straight and right margin convex until concave distal fifth, strongly hooked to right at apex, series of striations at middle on right side of mid-dorsal carina ( Figs. 12 e, 13e).

Macropterous female. Paratypes (n = 10), length 8.13–9.05 (mean = 8.61); maximum width 5.31–5.56 (mean = 5.44). Similar to male in general structure and coloration; pad of hairs on middle tibia reduced; posterior margin of mediosternite V and VI slightly concave; subgenital plate (VII) 1.4x as wide as long, lateral margins convergent, posterior margin slightly convex, posterolateral corners broadly rounded; posterior margin of laterosternite VI straight ( Fig. 14 e); pronounced lateral lobe on costal margin of right hemelytron at position of abdominal segment V.

Diagnosis

The claval commissure is longer than the pronotum measured at the midline in N. khlonglan , whereas in all other known species it is shorter than the pronotum. The posterolateral lobes of the pronotum are rounded and produced posteriorly. Males of this species can be recognized by the parameres, which appear to have a straight to slightly concave anterior margin and a sharp right angle in the anteromesal corner in strict dorsal view. Females can be recognized by the posterolateral corners of mediosternite VI distinctly deflected ventrad from the sternum. Also, females have a pronounced lateral lobe extending from the costal margin of the right hemelytron at about the position of abdominal segment V, similar to females of N. akekawati .

Discussion

This species has been found only in Namtok Khlong Lan ( Fig. 8 ) at Khlong Lan National Park, which is in the Thanon Thong Chai mountain range near the border with Burma. This species occurs on the near-vertical algae-covered rock face at the margin of the high shear forces of the waterfall. This species was collected with Oocyclus melinoventris Short & Swanson ( Coleoptera : Hydrophilidae ) and Onychotrechus esakii Andersen ( Hemiptera : Gerridae ).

Etymology

This species is named for the national park and waterfall in which it was collected.

Repositories

The holotype, allotype, and some paratypes are deposited in the Enns Entomology Museum, University of Missouri-Columbia, U.S.A. Additional paratypes will be deposited in the Royal Forestry Department, Bangkok, Thailand; Entomology Collection, Kasetsart University, Bangkok, Thailand; United States National Museum, Washington, D.C., U.S.A., California Academy of Sciences, San Francisco, U.S. A; and the Natural History Museum – Vienna, Austria.

Material examined

Holotype, macropterous male: THAILAND: Kampaeng Phet Province, Khlong Lan National Park, Namtok Khlong Lan, 16°07'N 99°16'E, 310 m, 21 August 2002, CMU team. Paratypes, including allotype, macropterous female: same locality as primary type, 6 April 2003, Sites, Vitheepradit, Prommi, & Setaphan, L-449 (2 males, 8 females, many nymphs).

Additional material examined

Same data as holotype, 19 July 2002; same data, 20 April 2002; same data 19 June 2002; same locality, 8 March 2002, R. W. Sites, L-273; same data, 7 April 2003, L-453.

Figures

FIGURE 8. Namtok Khlong Lan in Kampaeng Phet Province, Thailand, the type locality of Namtokocoris khlonglan n. sp.

FIGURE 10. Holotypes of a) Namtokocoris siamensis, b) Namtokocoris akekawati, c) Namtokocoris dalanta, d) Namtokocoris kem, e) Namtokocoris khlonglan, and f) Namtokocoris minor.

FIGURE 11. Left margin of pronotum and embolium of macropterous a) Namtokocoris siamensis, b) Namtokocoris akekawati, c) Namtokocoris dalanta, d) Namtokocoris kem, e) Namtokocoris khlonglan, and f) Namtokocoris minor.

FIGURE 12. Genital capsule of males of a) Namtokocoris siamensis, b) Namtokocoris akekawati, c) Namtokocoris dalanta, d) Namtokocoris kem, e) Namtokocoris khlonglan, and f) Namtokocoris minor. Scale bar = 1.0 mm

FIGURE 14. Ventral aspects of terminal abdominal segments of females of a) Namtokocoris siamensis, b) Namtokocoris akekawati, c) Namtokocoris dalanta, d) Namtokocoris kem, e) Namtokocoris khlonglan, and f) Namtokocoris minor.