Diognetus styrax, Yasunaga & Schwartz & Chérot, 2023

Yasunaga, Tomohide, Schwartz, Michael D. & Chérot, Frédéric, 2023, Revision of the plant bug genus Diognetus, with descriptions of thirteen new species from the Oriental and Eastern Palearctic Regions (Hemiptera: Heteroptera: Miridae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 63 (1), pp. 1-55 : 52

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https://doi.org/ 10.37520/aemnp.2023.001

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scientific name

Diognetus styrax

sp. nov.

Diognetus styrax sp. nov.

( Figs 3D–F View Fig , 19C–D View Fig , 21A–C View Fig , 22E–F View Fig , 34J–O View Fig , 36M–N View Fig )

Type material. HOLOTYPE: J, TAIWAN: NANTOU HSIEN: Huiseun Forest Area, along Guandao-xi, 24.0865, 121.0265, sweeping inflorescence of Styrax suberifolia, 14 Mar 2017, T. Yasunaga ( NMNS) ( AMNH _ PBI 00380755 ) GoogleMaps . PARATYPE: TAIWAN: Same data as for holotype, 1 ♀ ( TYCN).

Additional material examined. Same data, 5th instar nymph ( TYCN).

Description. Body oval (♀, Fig. 3E View Fig ) or elongate ovoid, subparallel-sided (J, Figs 19C–D View Fig ), moderate in size, 5.5– 5.7 mm. COLORATION: Basic coloration reddish-brown, with mottled pattern ( Figs 3E View Fig , 19C View Fig ). Head shiny, pale brown; clypeus darkened. Antennae pale reddish-brown; apex of segment II, segment III (except for pale extreme base) and segment IV dark brown. Labium pale brown, partly tinged with red; apical half of segment IV darkened. Pronotum reddish-brown, with posterior half darkened and posterior margin pale brown; mesal part of mesoscutum and anteromedial scutellum narrowly infuscate; pleura broadly fuscous; propleuron brown; scent efferent system creamy yellow. Hemelytron reddish-brown, speckled with dark maculae; cuneus slightly tinged with red; membrane smoky brown, with pale veins and some transparent maculae. Coxae and legs yellowish brown; pro- and mesofemora each with two obscure rings subapically; apical half of metafemur dark brown, with two pale rings subapically. Ventral surface of abdomen pale brown, mottled with darker maculae ( Fig. 19D View Fig ). SURFACE AND VESTITURE: As in generic diagnosis; dorsal surface weakly shining; punctures on pronotum and propleuron uniformly distributed; mesoscutum and scutellum pruinosed ( Fig. 34M View Fig ); scutellum shallowly and transversely rugose; hemelytron weakly shining, minutely pruinosed. STRUCTURE: Eyes large; vertex narrow. Antennal segment II about as long as labium. Labium slightly exceeding apex of mesocoxa but not reaching apex of metacoxa. Scutellum flat ( Fig. 34K View Fig ). Metathoracic scent efferent system as in Fig. 34L View Fig . Metatarsomere III about twice as long as I, slightly longer than II. MALE GENITALIA ( Figs 21A–C View Fig , 34O View Fig ): Left paramere with round-edged protuberance on sensory lobe and relatively broad hypophysis that is hooked at apex ( Fig. 21A View Fig ). Vesica with long LS and weak TP ( Fig. 21C View Fig ). FEMALE GENITALIA ( Figs 22E–F View Fig ): Some structures were not confirmed, due to teneral specimen. Posterior wall ( Fig. 22E View Fig ) with rather widened dorsal structure and moderate-sized interramal lobe.

Measurements. See Table 1.

Differential diagnosis. Based on the similarity in external appearance and genitalic structures, the present new species is considered as a closest relative of D. cheimon sp. nov. ( Japan) or D. dhampus sp. nov. ( Nepal), from which D. styrax sp. nov. can be distinguished by the following combination of characters: Vertex narrower in J; antennal segment II about as long as labium; protuberance on sensory lobe of left paramere rather rounded, less produced; surfaces of scutellum and hemelytron pruinosed, more sparsely punctate; shorter vesical MS; and interramal lobe wider, more rounded. The final instar nymph ( Fig. 3F View Fig ) is at first sight similar to two Japanese congeners, D. cheimon

sp. nov. and D. vernus sp. nov. (cf. Fig. 5 View Fig ); distinguished from them by generally lemon-yellow coloration, a pair of dark small spots on anterior wingpads, sparser vestiture on dorsum (cf. Fig. 36K View Fig vs. 36N), faint dark spots on each tibia and orange-pink spots scattered on abdominal sterna.

Etymology. Named for the generic name of the breeding host, Styrax formosanus; noun in apposition.

Biology. A pair of adults ( Figs 3D–E View Fig ) and a final instar nymph ( Fig. 3F View Fig ) were found to co-occur on the inflorescence of Styrax formosanus Matsum. ( Styracaceae ) ( Fig. 1I View Fig ) in central montane area of Taiwan.

Distribution. Taiwan (Nantou).


Tavera, Department of Geology and Geophysics


National Museum of Natural Science


American Museum of Natural History













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