Sundacapsus, Yasunaga & Chérot & Schwartz, 2021

Yasunaga, Tomohide, Chérot, Frédéric & Schwartz, Michael D., 2021, New genera and species of the Oriental mirine plant bugs from Southeast Asia, with six new combinations (Insecta: Heteroptera: Miridae: Mirinae: Mirini), Raffles Bulletin of Zoology 69, pp. 137-155 : 143-148

publication ID 10.26107/RBZ-2021-0012

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gen. nov.

Sundacapsus , new genus

Type species. Sundacapsus flavonitidus Yasunaga, Chérot & Schwartz , new species.

Diagnosis. Distinguished from other mirine genera by the following combination of characters: Moderate size (4.8−6.0 mm in total length); yellowish brown basic colouration; highly polished, oily shiny dorsum with sparse vestiture ( Figs. 4A, B View Fig , 5B View Fig ); long, almost linear antenna longer than body; slender, short labium not exceeding apex of mesocoxa ( Fig. 5A View Fig ); smooth, impunctate, glabrous pronotum ( Fig. 5A, B, E, F View Fig ); weakly inflated scutellum ( Fig. 5A, B View Fig ); shiny hemelytron with uniformly distributed, simple, reclining setae; trapeziform pygophore ( Fig. 5I View Fig ); left paramere with stout sensory lobe covered in long setae and slender, hooked hypophysis with axe-shaped apex ( Figs. 6B View Fig , 8H View Fig ); endosoma (vesica) membranous, with long, narrow spicule-like support on posterior surface and lobal sclerite on right side ( Fig. 6C View Fig ); noticeably straight gonapophyses ( Fig. 9C View Fig ) with rounded apices ( Figs. 8F View Fig , 9D View Fig ); and posterior wall with paired, spinulate dorsal structure ( Figs. 6D View Fig , 8D, E View Fig ).

Description. Male. Body elongate oval. COLOURATION: Generally yellowish brown; partly suffused with red, with more or less darkened scutellum and hemelytron ( Fig. 4A, B View Fig ). SURFACE AND VESTITURE: Dorsum highly polished, oily shiny, head smooth glabrous, pronotum glabrous, impunctate, scutellum somewhat swollen, shallowly and transversely rugose, hemelytron smooth, with uniformly distributed, pale, simple, reclining setae ( Fig. 5B View Fig ). STRUCTURE: Head: Subvertical ( Fig. 5E, F View Fig ), without sulcation, groove, or carina on vertex and frons ( Fig. 5B View Fig ); clypeus weakly projected. Antenna: Subequal in length to body, generally slender, almost linear, not incrassate; segments II–IV almost uniform in thickness; segment I slightly longer than width of head across eyes, longer than IV; segment II longer than maximum width across hemelytron; antennal segment III longer than head width across eyes; segment III slightly shorter than II; segments III and IV filiform. Labium: Relatively slender, reaching but not exceeding apex of mesocoxa, slightly shorter than metafemur ( Fig. 4C View Fig ). Thorax: Pronotum with weakly demarcated calli ( Fig. 5B View Fig ); scutellum somewhat swollen. Hemelytron: Obovate. Legs: Long, generally slender; tibial spines short, sparse; meta-tarsomere I shorter than II or III; pretarsus with parempodia lamellate, wedge-shaped; pulvilli absent ( Fig. 5H View Fig ). Genitalia ( Figs. 6A–C View Fig , 7A–D View Fig , 8G–I View Fig ): Pygophore rather long, not much narrowed towards apex, with smooth apical margin ( Fig. 5I View Fig ). Parameres as in Figs. 6A, B View Fig , 8G–I View Fig ; left paramere with developed, bulbous, strongly setose sensory lobe and slender, J-shaped hypophysis with axe-shaped apex ( Figs. 6B View Fig , 8H View Fig ); right paramere short, somewhat ovoid, with flat, widened apex ( Figs. 6A View Fig , 8I View Fig ); endosoma (vesica) widely membranous, with lobal-sclerite on right side; posterior surface with long, narrow supporting sclerite ( Fig. 6C View Fig ); ductus seminis with U-shaped sclerite at middle; gonopore ovate, thick-rimmed.

Female. Not significantly different from male in general appearance ( Fig. 4B View Fig ). Genitalia ( Figs. 6D, E View Fig , 7E, F View Fig , 8D–F View Fig , 9C, D View Fig ): Ovipositors uniquely round- or blunt-tipped, not sharpened ( Figs. 7F View Fig , 8F View Fig , 9C, D View Fig ); gonapophysis II straight, rather slender ( Fig. 9C View Fig ); apex of gonapophysis I minutely toothed ( Figs. 8F View Fig , 9D View Fig ); sclerotised ring elongate oval ( Fig. 6E View Fig , 7F View Fig ); posterior wall with obscure, narrow median process, paired, spinulate dorsal structure and slender, projecting interramal lobes ( Figs. 6D View Fig , 8D, E View Fig ) but sometimes interramal lobes very short ( Fig. 7E View Fig ).

Etymology. Named for the Sunda[land], combined with the mirine generic name Capsus Fabricius ; gender masculine.

Discussion. The present new genus is reminiscent of Poppiocapsidea Yasunaga which is composed of two Oriental species, P. biserratense (Distant, 1903) ( Fig. 10E View Fig ) and P. clypeale (Poppius, 1915) , by the similar facies (e.g., mediumsized, elongate ovoid body, pale brown basic colouration, shiny dorsum, long antenna). However, our new genus can be easily distinguished from Poppiocapsidea by the following characters: head rather oblique; vertex smooth, without mesal sulcus; pronotum, scutellum, and hemelytron highly polished, oily shiny; left paramere with developed, bulbous sensory lobe and slender hypophysis J-shaped, apex axe-shaped; endosoma lacking hair-like membranous processes along secondary gonopore; ovipositors with blunt-tipped, rounded apices; and elongate, finger-like interramal lobe.

The structure of the ovipositors in Sundacapsus are unusual, as the apices are rounded and not sharply pointed, being different from those in other mirid bugs which usually have sword-like ovipositors with sharp apices (cf. Figs. 8C View Fig , 9A, B View Fig ). The single representative of Sundacapsus described below is assumed to lay eggs into rather soft plant tissue. Based on this character (apical shape of the gonapophyses), we cannot imagine any reliable close relative for Sundacapsus . Comparison with Liocapsus Poppius , Orientocapsus Yasunaga & Schwartz , or Philostephanus Distant may merit careful consideration, as some members of these genera have similarly well-polished, glabrous dorsum and are known to occur in the Oriental Region. Nonetheless, they are considered to have remote relationships to Sundacapsus , judging from the completely different form of the male and female genitalia including the ovipositors (see Yasunaga & Schwartz, 2007).

The general appearance and elongate interramal lobes ( Figs. 6D View Fig , 8E View Fig ) of Sundacapsus are similar to those possessed by members of Lygocorides Yasunaga, 1991 known from eastern Asia. However, in the latter genus, the dorsal surface uniformly bears simple setae (cf. Yasunaga, 1996) and the interramal lobes are remarkably longer and broader ( Fig. 8J View Fig ). Based on the structure of the male genitalia, the two lineages (genera) are apparently remote from each other. We currently cannot suggest any candidate taxon definitely related to Sundacapsus .











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