Sadoletus laosensis, Ban, 2018

Ban, Teruaki, 2018, The lygaeoid bug family Heterogastridae (Hemiptera: Heteroptera: Lygaeoidea) from Laos and Thailand, with descriptions of three new species, Zootaxa 4446 (1), pp. 51-67 : 56-57

Sadoletus laosensis sp. nov.

( Figs. 6–7 , 14 , 17 , 20–24 )

Type Materials. Holotype: ♀, LAOS: 20°37'N, 102°00'E, alt. 837 m, Lak 11 Waterfall, 11 km South-east From Oudomxay, Oudomxay Prov. , 12.X.2009, Teruaki Ban (TUA) . Paratypes: LAOS: 1 ♀, Same locality as for holotype, 4.X.2009, Genki Ôishi leg. (TUA); Same date as for holotype , 3 ♂ 3 ♀, Teruaki Ban (TUA).

Diagnosis. Recognized among congeners of Sadoletus by the following characters: head, anterior lobe of pronotum and basal half of scutellum black ( Figs. 6, 7 ); labium exceeding posterior margin of prothorax ( Fig. 14 ); posterior lobe of pronotum pale yellow, with 2 pale brownish longitudinal markings ( Figs. 6, 7 ); corium white in basal two-thirds and dark brown in apical third, with pale brown markings around inner angle; clavus white ( Figs. 6, 7 ); femora and tibiae generally pale yellow, profemur with 2 spines; abdominal sterna reddish brown; posterior margin of sternite VI weakly sinuate in female ( Fig. 17 ); posterior margin of pygophore and cuplike sclerite not fused ( Fig. 20 ); paramere acute at apex ( Fig. 21 ).

Description. Female (holotype): Short decumbent setae on body silvery. Punctures on pronotum, scutellum, and corium brown. Head ( Fig. 7 ) black. Clypeus yellowish brown. Antenna generally brownish yellow, apical three-quarters of segment IV tinged with brown. Labium brownish yellow; basal three-quarters of segment I and apex of segment IV brown. Pronotum ( Fig. 7 ) black in anterior lobe, anterior margin reddish brown; posterior lobe of pronotum pale yellow, with darker sublateral stripes ( Fig. 7 ). Venter of thorax black to dark brown for the most part; posterior margin of metepimeron brownish yellow; peritreme yellowish. Scutellum ( Fig. 7 ) black to dark brown in basal half and yellowish in apical half; apical half of scutellum with pale yellowish white longitudinal stripe along meson. Corium ( Fig. 7 ) pale in basal two-thirds and dark brown in remaining part, with small brown marking around inner angle; clavus pale; hemelytral membrane hyaline, with pale brown transverse marking at middle. Coxae pale reddish brown; trochanters, femora and tibiae pale yellow; metafemur and metatibia with brown annulations; tarsomere I pale yellow, tarsomeres II and III pale brown. Abdomen ( Fig. 14 ) reddish brown; posterior margin of segments V and VI, middle of sternites VII and VIII dark brownish yellow; each laterotergite brown.

Body length ( Fig. 7 ) approximately 3 times width across humeri. Head ( Fig. 7 ) 1.8 times as wide as its length, covered with both rough and fine punctures; tylus tumid upwards; clypeus weakly projecting anteriad; juga with decumbent setae. Eyes occupying nearly half area of head in lateral view, not reaching anterior margin of pronotum. Antennae covered with suberect setae; proportional lengths of segments I to IV 1.0: 1.5: 1.3: 2.2. Labium slightly exceeding posterior margin of prothorax, not reaching mesocoxae; proportional lengths of segments I to IV 1.2: 1.3: 1.1: 1.0.

Pronotum ( Fig. 7 ) slightly more than 1.4 times as wide as its length, nearly trapezoidal, lacking collar, and with lateral margin of anterior lobe weakly serrate; posterior lobe 1.5 times as long as anterior lobe, slightly more convex than anterior lobe, covered with dense punctures; posterior margin almost straight. Venter of prothorax, mesepisterna and metepisterna covered with decumbent setae. Scutellum ( Fig. 7 ) triangular, weakly tumid transversely in basal half, covered with decumbent setae. Hemelytra ( Fig. 7 ) exceeding apex of abdomen; apical margin of corium as long as claval suture. Profemur moderately expanded, armed with 2 spines ventrally at about apical third, the basal spine larger; tibiae and tarsi covered with long erect setae.

Abdomen ( Fig. 7 ) wider than hemelytral width; sternum entirely covered with decumbent setae. Ovipositor ( Fig. 17 ) straight, reaching posterior margin of sternite VI, approximate oviposital length 0.45 mm; the two hemiventrites of the medially completely bisected sternite VII are short therefore posterior margins of sternites III– V straight, posterior margin of sternite VI weakly sinuate ( Fig. 17 ).

Spermatheca (paratypes) as in Fig. 24 .

Male (paratypes): resembles female in general appearance. Body ( Fig. 6 ) evidently narrower; pygophore ( Fig. 20 ) nearly spherical in dorsal view, covered with suberect setae; maximum width of dorsal sinus of posterior aperture more than one-quarter as wide at middle as pygophore, without collar along anterior margin; posterior margin of pygophore and cuplike sclerite not fused; paramere ( Fig. 21 ) narrow, twisted at basal third, acute at apex, sensory processes projecting laterally; phallosoma ( Figs. 22, 23 ) nearly twice as long as its width in ventral view, wrinkled at apical margin.

Measurements. [♂ (n=3) / ♀ (n=5), value for holotype female in parentheses]. Body length 4.3–5.0 / 4.8–5.2 (5.2); body height between coxae and dorsum 1.1–1.25 / 1.25–1.35 (1.25); head length 0.8–0.95 / 0.75–1.0 (0.75), head width across eyes 1.2–1.25 / 1.25–1.35 (1.35); length of antennal segments I–IV respectively 0.35–0.4 / 0.33– 0.38 (0.38), 0.65–0.69 / 0.53–0.65 (0.58), 0.6–0.65 / 0.5–0.63 (0.5), 0.78–0.93 / 0.83–0.88 (0.83); length of rostral segments I–IV respectively 0.38–0.43 / 0.4–0.43 (0.4), 0.43–0.48 / 0.38–0.48 (0.43), 0.35–0.36 / 0.33–0.38 (0.35), 0.3–0.31 / 0.31–0.35 (0.33); mesal pronotal length 1.1–1.25 / 1.1–1.3 (1.25); posterior pronotal width 1.38–1.5 / 1.5–1.8 (1.75); mesal scutellal length 0.75–0.83 / 0.8–0.95 (0.95); basal scutellal width 0.75–0.85 / 0.88–1.0 (1.0); hemelytral length 3.2–3.38 / 3.25–3.5 (3.5); maximum width across hemelytra 1.15–1.38 / 1.58–1.85 (1.85).

Distribution. Laos (Oudomxay Prov.).

Etymology. The species epithet is the Latin adjective “ laosensis ” referring to type locality, Laos.

Remarks. This new species is most similar in general appearance to S. bakeri Bergroth , but it can be distinguished from the latter by a combination of the following characters: antennal segment II 1.5 times longer than segment I (vs. antennal segment II twice longer than segment I); labium exceeding posterior margin of prothorax slightly, not reaching mesocoxae (vs. reaching mesocoxae); coxae pale reddish brown (vs. coxae black); ground color of femora and tibiae pale yellow (vs. femora and tibiae yellowish brown).

Biological notes. The specimens were collected on fruiting trees of Ficus sp. in the forest along a mountain stream with several other heterogastrid and rhyparochromid species.

Figures

FIGURES 6–9. Habitus of Heterogastridae species from Laos and Thailand. 6–7, Sadoletus laosensis sp. nov., male (6), holotype, female (7); 8–9, S. melasmus sp. nov., male (8), holotype, female (9). Scales: 1.0 mm.

FIGURES 14–16. Females of each new Sadoletus species, ventral view. 14, Sadoletus laosensis sp. nov.; 15, S. melasmus sp. nov.; 16, S. subpellucidus sp. nov. Scales: 1.0 mm.

FIGURES 17–19. Abdominal sternite VI and ovipositer of each new Sadoletus species, ventral view. 17, Sadoletus laosensis sp. nov.; 18, S. melasmus sp. nov.; 19, S. subpellucidus sp. nov. Scales: 1.0 mm.

FIGURES 20–24. Sadoletus laosensis sp. nov. 20, Pygophore, dorsal view (setae omitted from left half); 21, left paramere, dorsal view; 22–23, phallus (endosoma not everted), ventral (22) and lateral (23) views; 24, spermatheca. Scales: 0.1 mm.