Hornylia obtusipetala, Chen & Li & Cai, 2020

Chen, Zhuo, Li, Hu & Cai, Wanzhi, 2020, A new species of Hornylia Wygodzinsky (Hemiptera, Heteroptera, Reduviidae, Emesinae) from Thailand, ZooKeys 917, pp. 105-115 : 105

Hornylia obtusipetala sp. nov. Figs 1-3 , 4-11 , 12-22

Diagnosis.

Body length 10.98 mm; apex of labial segment II not reaching level of anterior margin of eyes (Fig. 5 ); anteroventral series of fore femur consisting of about seven medium-sized processes, posteroventral series consisting of ca. four large- and two medium-sized processes (Figs 6 , 7 ); mid and hind femora each with one indistinct, brown medial annulus and two distinct, blackish brown annuli, one beyond middle and another subapically (Fig. 8 ); ventral surface of abdomen brown, mottled with blackish brown (Figs 3 , 8 , 10 ); parameres expanded and blunted apically, with a sharp subapical process (Figs 10 - 12 , 18-20 ).

Description.

Apterous male. Coloration: Body generally yellowish brown (Figs 1-3 ). Head (Figs 4 , 5 ): lateral surface as well as gena blackish brown; postocular part slightly mottled with black; eyes silvery; antennae reddish brown, base of first segment pale brown, darkening toward its apex gradually; clypeus and labrum light brown; labium somewhat shiny, labial segment II light brown on apical 2/3, segment III (except apex) dark brown. Prothorax (Figs 4 , 5 ): lateral surface and tubercle of each anterolateral angle blackish brown, ventral surface reddish brown. Meso- and metathorax (Figs 4 , 5 ) with blackish brown lateral surface and reddish brown ventral surface. Fore coxa light brown on basal half and brown on apical half, with a dark brown subapical patch on inner and outer surfaces; fore trochanter brown as apical half of coxa; fore femur light brown, with subbasal, medial, and apical patches dark brown, spiniferous processes light yellowish brown, with their apical spines black; fore tibia light brown as general color of femur, with base, medial patch and apex brown, denticles on ventral surface black; fore tarsus brown, shiny (Figs 6 , 7 ). Mid and hind femora (Figs 1-3 , 8 ) light yellowish brown, with a brown, indistinct medial annulus and two blackish brown, very distinct annuli, one situated beyond middle, and another subapically; mid and hind tibiae (Figs 1-3 ) light yellowish brown with their bases and apexes brown; mid and hind tarsi uniformly brown. Abdomen (Figs 1-3 , 9 , 10 ): tergites with an obscure, nearly disrupted medial stripe and two pairs of lateral brownish stripes, apical half of tergite VII blackish brown (Fig. 9 ); dorsal laterotergites (Fig. 9 ) yellowish brown as general body color, their posterior halves reddish brown to dark brown, posterolateral angles blackish brown; ventral laterotergites (Fig. 10 ) blackish brown, with outer margin yellowish brown; sternites with dark brown suffusion and a pair of lateral brownish stripes; sternite VII (Fig. 10 ) and segment VIII (Figs 10 , 12-14 ) each with two pairs of blackish brown bands; pygophore (Figs 10 - 12 , 15-17 ) blackish brown and suffused with yellowish brown.

Structure: Body elongate. Surfaces of head, thorax and abdomen conspicuously granulated (Figs 1 - 5 ). Body sparsely clothed with very short, decumbent setosity, difficult to observe; first and second (except apical portion) antennal segments sparsely clothed with short setae; apical portion of second antennal segment as well as third and fourth antennal segments densely clothed with decumbent, short pubescence; dorsum of fore trochanter with a pair of erect, long setae; fore femur and fore tibia with numerous erect, long setae (Fig. 6 ); apex of fore tibia and base of fore tarsus with dense, decumbent, long golden setae (Fig. 7 ); femora and tibiae of mid and hind legs densely clothed with short, decumbent setae; mid and hind tarsi densely clothed with short pubescence.

Head (Figs 4 , 5 ) porrect forwardly, 1.76 times as long as wide across eyes; anteocular part 2.13 times as long as postocular part; postocular part strongly granulated on dorsum; interocular space 3.50 times as wide as a single eye in dorsal view; eyes rather small, protruding laterally in dorsal view, far remote from dorsal and ventral outlines of head in lateral view; antennae 0.59 times as long as body length, with first segment longest and third segment shortest; labrum smooth; labium as shown in Fig. 5 , labial segment II longest, strongly curved at base, segment III shortest, slightly swollen, reaching anterior margin of eyes, segment IV gradually tapering. Prothorax (Figs 4 , 5 ) subcylindrical, 1.54 times as long as head, and 4.17 times as wide as its greatest width; pronotum divided vaguely into anterior and posterior lobe, with anterior and posterior margins concave, posterior lobe extremely short and indistinct; posterior margin of prosternum largely concave, emarginated. Meso- and metanota (Figs 4 , 5 ) carinated longitudinally along midportion, mesonotum 0.36 times as long as pronotum, metanotum 0.34 times as long as pronotum. Fore legs (Figs 6 , 7 ) stout; fore coxa cylindrical, 0.68 times as long as fore femur; fore trochanter simple, unarmed in venter; anteroventral series of fore femur composed of about seven medium-sized and 20 small-sized processes; posteroventral series composed of about four large-sized, two medium-sized, and eleven small-sized processes, basal most process longest, distinctly longer than distance between basal most process and base of fore femur; accessory series composed of ca. 13-15 small-sized processes arranged irregularly; fore tibia short, 0.45 times as long as fore femur, ventrally with 10-12 strongly sclerotized denticles; fore tarsus 0.80 times as long as fore tibia, slightly curved, ventrally with a row of decumbent, knifelike setae. Mid and hind legs (Figs 1-3 , 8 ) slender; mid and hind tibiae 1.25 and 1.64 times as long as respective femora, hind tibia slightly shorter than body length; mid and hind tarsi minute, apically with a pair of sickle-like claws. Abdomen (Figs 1-3 , 8 ) elongate, 6.14 times as long as its greatest width, with a medial longitudinal ridge on ventral surface; abdominal tergite VII (Figs 9-11 ) projected posteriorly, apically rounded, warping upwardly, covering most part of pygophore; segment VIII (Figs 10 , 12-14 ) distinctly exposed in lateral view, anteromedial margin strongly concave, posteromedial margin nearly straight.

Male genitalia: At rest as shown in Fig. 12 . Pygophore (Figs 12 , 15-17 ) elongate oval, anterior dorsal sclerotization narrow, insertion of paramere slightly produced; posterosuperior process (Figs 16 , 17 ) elongate spine-like, bent near base, apex sharp, slightly curved. Parameres (Figs 18-20 ) broad, covered with simple setae, apical half expanded, apex blunted; subapical projection (Fig. 18 ) acute; margin between apex and subapical projection emarginated. Phallus as in Figs 21 and 22 : articulatory apparatus thickened, strongly curved; basal plates separate; pedicel very short; phallosoma divided into two lobes, strongly sclerotized, apex blunt.

Measurements [in mm, male (N = 1)]. Length of body 10.98; length of head 1.30; length of anteocular part 0.49; length of postocular part 0.23; width across eyes 0.74; interocular space 0.47; length of antennal segments I-IV = 3.20, 2.25, 0.37, 0.71; length of labial segments II-IV = 0.38, 0.15, 0.32; length of anterior pronotal lobe 1.91; length of posterior pronotal lobe 0.09; width of anterior pronotal lobe 0.48; width of posterior pronotal lobe 0.32; length of mesonotum 0.72; length of metanotum 0.68; length of fore coxa, trochanter, femur, tibia, tarsus (without claw) = 1.29, 0.29, 1.91, 0.87, 0.70; length of mid femur, tibia, tarsus = 5.41, 6.76, 0.24; length of hind femur, tibia, tarsus = 6.20, 10.15, 0.27; length of abdomen 3.81; maximum width of abdomen 0.62.

Type material.

Holotype (male): Thailand, Chanthaburi, Khao Soi Dao, 25.xii.2007, leg. W. Sakchoowng (CAU).

Etymology.

The specific epithet is derived from Latin obtus - (meaning obtuse or blunt) and - petala (meaning petal), referring to the apically expanded and blunted parameres of the new species.

Distribution.

Thailand (Chanthaburi).

Figures

Figures 1 - 3. Hornylia obtusipetala sp. nov., male, holotype, habitus 1 dorsal view 2 lateral view 3 ventral view. Scale bar: 3.00 mm.

Figures 4 - 11. Hornylia obtusipetala sp. nov., male 4, 5 head, thorax and base of abdomen, antennae and legs removed 6 left fore leg 7 right fore femur, tibia and tarsus 8 body with fore coxae, femora of left mid and hind legs, arrows indicating the indistinct annuli on ventral surface of mid and hind femora 9 - 11 apex of abdomen 4, 9 dorsal view 5, 6, 10 lateral view 7, 8 ventral view 11 caudal view. Scale bars: 0.75 mm (4 - 7, 9, 10); 1.50 mm (8); 0.375 mm (11).

Figures 12 - 22. Hornylia obtusipetala sp. nov., male 12 abdominal segment VIII and genitalia, the arrow points to the apex of phallus 13, 14 abdominal segment VIII 15 - 17 pygophore 18 - 20 paramere 21, 22 phallus 12, 14, 16, 18, 21 lateral view 13, 15, 20, 22 dorsal view 17 caudal view 19 ventral view. Scale bars: 0.25 mm (12); 0.375 mm (13 - 19); 0.50 mm (20 - 21).