Orthonotus Stephans, 1829

Yasunaga, Tomohide, 2022, The plant bug subfamily Phylinae in Japan, with key to genera and descriptions of eight new species (Hemiptera: Heteroptera: Miridae), Zootaxa 5094 (1), pp. 1-52 : 18-19

publication ID

https://doi.org/ 10.11646/zootaxa.5094.1.1

publication LSID

lsid:zoobank.org:pub:72F6E1D9-E9E4-41F6-9AC0-97A249F94E68

persistent identifier

https://treatment.plazi.org/id/AC7FEA3B-081C-FFFB-FF78-FB9CFA4976AE

treatment provided by

Plazi

scientific name

Orthonotus Stephans, 1829
status

 

Orthonotus Stephans, 1829 View in CoL View at ENA

Diagnosis: East Asian members can be distinguished from other phyline taxa by the following combination of characters: Macropterous, not sexually dimorphic in coloration (cf. Fig. 9 View FIGURE 9 A−B, F−G) but female antennal segment II shorter than that of male; body generally fuscous; overall appearance elongate ovoid or oval; dorsal surface shining, with simple, semierect setae and silvery, recumbent, lanceolate setae ( Figs. 23B, E, L View FIGURE 23 ; 24 View FIGURE 24 M−O); head weakly porrect; labium slender, its apex reaching apex of metacoxa; hemelytra more or less declivous at cuneal fracture ( Fig. 9 View FIGURE 9 D−E); tibiae (at least apical half) pale, without dark spot at base of each spine; pulvilli comparatively wide ( Fig. 23I, O View FIGURE 23 ); male genital segment (pygophore) with broad apical keel ventrally ( Figs. 10B, D View FIGURE 10 ; 24D, I View FIGURE 24 ); phallotheca elongate, gradually tapered towards apex ( Fig. 24A, E, J View FIGURE 24 ); vesica stout, short, terminating in an apical hook ( Fig. 10A, C, E View FIGURE 10 ; 24C, H, L View FIGURE 24 ); bursa copulatrix with small-sized, thick-rimmed sclerotized rings ( Figs. 10F, H View FIGURE 10 ; 25E, K View FIGURE 25 ); posterior wall with relatively wide, smooth interramal sclerite ( Fig. 25C, H View FIGURE 25 ).

Discussion. Orthonotus has been known by 21 Palearctic species and the following congeners were recorded from eastern Asia ( Schuh, 2002 – 2013; Aukema, 2018): Orthonotus bicoloripes Kerzhner, 1988 (from Japan, Korea, and Russian Primorsky Territory), O. alpestris (Reuter, 1906) , O. pallidipennis (Reuter, 1906) and O. tibialis (Reuter, 1906) (from Sichuan, China) (cf. Kerzhner, 1997; Yasunaga, 2001d). The genus is principally composed of the Palearctic elements, and, therefore, the generic placement of O. simplex (Walker, 1873) described from Sri Lanka needs further verification. Some western Palearctic congeners of Orthonotus , such as O. ponticus (Horváth) and O. rufifrons (Fallén) , exhibit remarkable sexual dimorphism and the coleopteroid female adults are reminiscent of hallodapine runner plant bugs of the genus Hallodapus (cf. Yasunaga et al., 2019; Tamada et al., 2020). However, the females of East Asian species are always macropterous, so far as known (cf. Fig. 9B, G View FIGURE 9 ).

The following key would aid in unequivocal identification of three East Asian Orthonotus spp. including two new species from Japan. These three species are arboreal and inhabit deciduous broadleaf forests in temperate and cold temperate zones. In Russian Primorsky (Vladivostok), predation on a small lepidopteran adult by a female of O. bicoloripes (= the individual shown in Fig. 9G View FIGURE 9 ) was observed ( Yasunaga, 2001d).

Key to East Asian species of Orthonotus

1. Basal 1/3–1/2 of each tibia darkened; metafemur uniformly fuscous ( Fig. 9D View FIGURE 9 ).......................... O. takaii n. sp.

– All tibiae pale reddish or yellowish brown, or less than basal 1/5 (or extreme base) of each tibia darkened; metafemur bicolorous, with paler apex or apical part............................................................................ 2

2. Sexual dimorphism distinct in general shape ( Fig. 9F View FIGURE 9 vs. 9G); antennal segment I fuscous; pro- and mesofemora almost wholly darkened; metafemur dark brown, with yellowish extreme apex; species herein excluded from the Japanese fauna.................................................................................................. O. bicoloripes View in CoL

– Body shape similar in both sexes ( Fig. 9A View FIGURE 9 vs. 9B); antennal segment I reddish or orangish brown; pro- and mesofemora widely pale orange brown apically; metafemur pale reddish or orange brown, with darkened basal 1/4−1/2 ( Fig. 9H View FIGURE 9 )................................................................................................. O. nakagawai n. sp.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hemiptera

Family

Miridae

Tribe

Phylini

SubTribe

Phylina

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