Diognetus giganteus, 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 : 18

Diognetus giganteus sp. nov.

( Figs 7I , 27J− K )

Type material. HOLOTYPE: ♀, MALAYSIA: PAHANG: Cameron Highlands , 4.488, 101.367, at UV light, 28 Jul 1986, S. Gotoh ( ZRC) ( AMNH _ PBI 00380748 ).

Description. Female (holotype). Body ovoid, largest among known congeners with total length 6.7 mm, maximum width 3.2 mm. COLORATION: Dorsum pale brown, partly tinged with red ( Fig. 7I ). Head reddish-brown. Antennae pale brown; segment I pale reddish-brown; apical 1/5 of segment II, whole segment III and segment IV (except for yellow extreme base of III) dark brown. Labium shiny pale reddish-brown (segments III− IV not observed as heavily glued). Pronotum irregularly speckled with dark maculae; mesoscutum and scutellum reddish-brown, with irregular symmetrical dark maculae and yellow apex; lateral margin of pronotum and dorsal half of propleuron shiny dark brown; mesepimeron and episternum infuscate; scent efferent system creamy yellow. Hemelytron pale reddish-brown, speckled with irregular dark maculae; cuneus pale brown, with sanguineous suffusion along inner margin; membrane pale grayish brown, semitransparent, with lighter veins. Coxae and legs reddish-brown; metafemur with two brown rings subapically (basal one wider); tarsi pale brown. Ventral surface of abdomen pale brown, with reddish or brownish lateral and posterior margins. SURFACE AND VESTITURE: As in generic diagnosis; dorsal vestiture relatively short; scutellum and hemelytron rather matte, weakly and sparsely punctate ( Fig. 27K ). STRUCTURE: Eye relatively large; vertex a little narrower than an eye in dorsal view. Antennal segment II slightly longer than pronotal width. Scutellum inflated, transversely rugose. Scent efferent system relatively large, with thick peritreme ( Fig. 27J ). FEMALE GENITALIA: Not examined, as a single available specimen is excessively glued.

Male. Unknown.

Measurements. See Table 1.

Differential diagnosis. Easily recognized by its largest size among known congeners; ovoid and tumid body; and relatively inflated pronotal disk and scutellum. These diagnostic characters enable to be distinguished from any other known species of Diognetus .

Etymology. Latin adjective giganteus (large, giant), referring to its largest size among the congeners.

Biology. Unknown.

Distribution. Malaysia (Pahang).

Figures

Fig. 7. Habitus images of Diognetus spp.A−C − D. bagmaticus sp. nov.,J (A−B) and♀ (C); D – undeterminedJ specimen from Queensland,Australia; E−F − D. dhampus sp. nov.,J; G−H − D. duwalorum sp. nov., holotype J; I − D. giganteus sp. nov., holotype ♀; J−K − D. gotohi sp. nov., holotype J; L−N − D. flavigenis (Horváth, 1905), J (M − head in frontal view). Scale bar 2 mm.

Fig. 27. Scanning electron micrographs for Diognetus dhampus sp. nov., J (A−E), D. duwalorum sp. nov., holotype J (F−I), D. giganteus sp. nov., holotype ♀ (J−K) and D. gotohi sp. nov., holotype J (L−O). A, L − anterior body, left lateral view; F, J − left lateral habitus; B, D − scutellum and adjacent structures; C, G, M − pleura and scent efferent system, left lateral view; D, I, N − metatarsus; E, H, O – pygophore.