Sadoletus alphus, Gao & Malipatil, 2019

Gao, Cuiqing & Malipatil, M. B., 2019, Revision of the genus Sadoletus Distant, with description of new species from China and Australia (Hemiptera: Heteroptera: Heterogastridae), Zootaxa 4613 (2), pp. 251-289 : 284-287

18. Sadoletus alphus sp. nov.

( Figs. 25–26 )

Description ( Fig. 25 ). Head black with blackish brown eyes, red ocellus and pale yellow tylus. Antenna generally dark brown; labium yellow. Pronotum shiny; anterior lobe of pronotum black, with a yellowish white spot on medi- an of anterior margin; ground colour of posterior pronotal lobe black, with pale median longitudinal ridge; two large tumid lateral spots and other two small spots near posterolateral angles yellowish white. Scutellum blackish brown or black with apex pale yellow, with distal median black longitudinal line shiny. Corium pale yellow with variegated punctures; two longitudinal stripes along basal of exocorium and spot on distal one third of apical margin of corium blackish brown, and black circular spot present at inner angle in male; corium almost totally pale yellow in female; clavus pale yellow, with longitudinal dark stripe along claval commissure; hemelytral membrane hyaline, without any dark spot at middle. Venter of head and thorax black, with buccula brown, posterior margins of pro-, meso- and metapleura brown, covered with dense decumbent hairs. Peritreme brown with apex pale. Coxae variegated; femora and tibiae pale yellow, distal one third of femora with black annulation; tibiae with two black annulations. Tarsomeres I, III and claw complex brown; tarsomere II yellow. Abdomen brown, shiny, with trichobothria blackish brown; each laterotergite bicoloured, black with posterolateral angle pale.

Structure. Head covered with fine punctures; tylus distinctly tumid upwards; eyes occupying more than half area of head in lateral view; antennae covered with both erect and suberect setae; labium slightly exceeding mesocoxae. Pronotum covered with dense punctures, two large tumid pale spots on posterior lobe only covered with quite a few sparse punctures; anterolateral angle rectangular; posterolateral angle rounded; lateral margin of anterior lobe serrate; posterior lobe about 1.2 times as long as anterior lobe; posterior margin straight. Scutellum weakly tumid transversely in basal half, without distinct setae. Hemelytra exceeding apex of abdomen; lateral margin of corium sinuate; clavus arranged with three lines of punctures, with innermost line incomplete; claval suture slightly longer than apical margin of corium. Profemur moderately expanded, armed with a spine and other small spine ventrally at about apical third; tibiae and tarsi only covered with suberect setae. Abdominal connexivum almost fully covered by hemelytra; sternum covered with short decumbent setae. Female resembles male in general appearance, except body slightly wider, colouration of venter darker.

Abdomen ( Fig. 26a, b ): Sutures between tergites III–IV slightly curved caudad, IV–V and V–VI parallelly curved caudad in the middle area, VI–VII slightly sinuate. Outer laterotergite II absent. Anterior margin of tergite I, posterior half of tergites II and III, and median areas of tergites IV–VI covered with dense punctures. Trichobothria with middle one of that on sternites III–IV slightly behind other two.

Female: Sternites III–V not fused together. Inner laterotergites III–IV present. Anterolateral angle of tergite VIII with anterolateral apodemes (as Fig. 9k ). Median line of sternites II–V weakly sclerotized. Two halves of medially completely bisected sternite VII even longer therefore posterior margins of only sternite III straight, sternites IV–VI greatly narrowed in midline. Female genitalia: Spermathecal bulb and distal part of duct sclerotized; bulb globular, without any rim or flange ( Fig. 26i ); distal part of duct enlarged and twisted ( Fig. 26i ), but other part of duct thin, twisted and elongated.

Male genitalia ( Fig. 26 c–h): Cuplike sclerite not fused with posterior margin of pygophore opening; cuplike sclerite trapezoidal, without any ridge or outgrowth. Paramere with obtuse outer lobe and pointed inner lobes; blade sickle-shaped.

Measurements. [Holotype ♂ / Paratype ♀]. Body length 4.04 / 4.83; maximum width across hemelytra 1.42 / 1.71; head length 0.45 / 0.52, head width across eyes 1.15 / 1.35; length of antennal segments I–IV respectively 0.28 / 0.37, 0.55 / 0.62, 0.48 / 0.52, 0.67 / 0.71; length of labial segments 0.50 / 0.64, 0.46 / 0.73, 0.48 / 0.64, 0.32 / 0.46; mesal pronotal length 0.96 / 1.14; anterior pronotal lobe length 0.44 / 0.53; posterior pronotal lobe length 0.52 / 0.61; anterior pronotal width 1.03 / 1.20; posterior pronotal width 1.38 / 1.68; mesal scutellar length 0.83 / 1.01; basal scutellar width 0.77 / 0.99; hemelytral length 2.61 / 3.11.

Types Examined. CHINA: HOLOTYPE , male, Yunnan, Guangnan, Bamei Village \ 2011-VIII-9 \ at light, Jiao Kelong leg. \ Nankai University (pr) (NKUM). PARATYPES, 1♀, same data \ Jiao Kelong, Mu Yiran leg. \ Nankai University (pr) ( NKUM) ; 1♀, Hainan, Sanya , urban area \ 2011-VII-22 \ at light, Mu Yiran leg. \ Nankai University (pr) ( NKUM) .

Distribution. China (Yunnan, Hainan).

Etymology. The species name is a latin word “ alphus ” alludes to the white spots on the pronotum.

Remarks. The colour pattern of this new species is quite unique. It can be distinguished from other species by a combination of the following characters: anterior lobe of pronotum black, with a yellowish white spot on median of anterior margin; ground colour of posterior pronotal lobe black, with pale median longitudinal ridge; two large tumid lateral spots and other two small spots near posterolateral angles yellowish white; tylus distinctly tumid upwards.

Figures

FIGURE 9. Sadoletus planus sp. nov. paratypes. a, male abdominal dorsum, dorsal view; b, male abdominal venter, ventral view; c, female abdominal dorsum, dorsal view; d, female abdominal venter, ventral view; e, pygophore, posterodorsal view; f, phallotheca, lateral view; g–j, left paramere, four different aspects; k, female, tergite VIII, dorsal view; l, ovipositor, inner view. Abbreviations: ap, apodeme; sm, spermatheca.

FIGURE 25. Sadoletus alphus sp. nov. a, holotype, male, dorsal view; b, same, ventral view; c, paratype, female, dorsal view; d, same, ventral view.

FIGURE 26. Sadoletus alphus sp. nov. a–b, paratype. a, female abdominal dorsum, dorsal view; b, female abdominal venter, inner view; c–h, holotype. c, pygophore, posterodorsal view; d, phallus, lateral view; e–h, left paramere, four different aspects; i, paratype, spermatheca. Abbreviations: sm, spermatheca.