Miyamotolygus, Yasunaga & Schwartz & Chérot, 2018

Yasunaga, Tomohide, Schwartz, Michael D. & Chérot, Frédéric, 2018, Review of the plant bug genus Prolygus and related mirine taxa from eastern Asia (Hemiptera: Heteroptera: Miridae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 58 (2), pp. 357-388: 379-380

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http://doi.org/ 10.2478/aemnp-2018-0030

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gen. nov.

Miyamotolygus   gen. nov.

Type species. Lygocoris rufilorum Lu & Zheng, 1998   , here designated.

Diagnosis. Distinguished from other superficially similar genera by the following combination of characters: generally pale green, ovoid body; two types (pale simple setae and sericeous setae) of dorsal vestiture; narrow but continuous basal carina of vertex; red stripe on lorum; uniformly linear antenna slightly shorter than body; darkened extreme apices of clavus, embolium and cuneus; broadly reddish brown metafemur; and unique shape of male and female genitalia.

Description. Male. Body ovoid, rather small to moderate in size (3.9–4.5). COLOURATION: Generally pale (somewhat olive) green, partly with brownish or reddish patterns ( Figs 63 View Figs 54–65 , 88–89 View Figs 83–93 , 148 View Figs 147–158 ). Maxillary plate with red stripe. Apices of clavus and scutellum dark or reddish brown; apex of embolium usually faintly darkened. Metafemur with apical 0.66 deep reddish brown; each tibia without dark spots at bases of spines; tibial spines dark or reddish brown. Ventral surface of abdomen partly or widely darkened (♁ in particular). SURFACE AND VESTITURE: Dorsal surface shining, with uniformly distributed, simple, silky, reclining setae, partly mixed with sericeous, reclining setae on mesoscutum, scutellum and hemelytron ( Figs 63 View Figs 54–65 , 88–89 View Figs 83–93 , 148 View Figs 147–158 ). Pronotum shiny, uniformly and shallowly punctate. STRUCTURE: Head vertical, short; vertex with continuous, narrow, basal transverse carina about as thick as antennal segment III. Antenna uniformly slender and linear, slightly shorter than body; segment II slightly longer than basal width of pronotum; segment IV slightly longer than I. Labium reaching or slightly exceeding apex of mesocoxa. Calli rather clearly demarcated from disc; collar slightly thicker than basal carina of vertex; scutellum weakly inflated mesally; hemelytron not strongly declivous at cuneal fracture. Metafemur relatively tumid; tarsomere III longer than I or II. GENITALIA ( Figs 159–161 View Figs 159–169 ): Pygophore weakly pointed at apex, lacking spine at base of left paramere. Left paramere ( Fig. 160 View Figs 159–169 ) with sensory lobe not developed basally; hypophysis with a small branch at apex; right paramere ( Fig. 159 View Figs 159–169 ) short, straight, about half as long as left one, with small, flattened hypophysis. Endosoma ( Fig. 161 View Figs 159–169 ) with long, flat primary lobal-sclerite (PL) and secondary lobal-sclerite (SL), densely furnished with noticeable hair-like spinules above heavy- rimmed secondary gonopore (GP); third lobe (TL) with sclerotized process apically and dentate sclerite at middle.

Female. As in male. GENITALIA ( Figs 162–163 View Figs 159–169 ): Bursa copulatrix rather heavily sclerotized ( Fig. 162 View Figs 159–169 ), with sclerotized structure; sclerotized rings thick-rimmed, large, teardrop-shaped; posterior wall with median process, lacking dorsal structure; lateral lobe narrow, toughened with sclerotized dorsal margin; interramal lobe small, thick, triangular, spinulate; interramal sclerite wide ( Fig. 163 View Figs 159–169 ).

Etymology. Named in honor of the late Japanese heteropterist, Dr. Syoiti Miyamoto (1913–2010) ( ISHIKAWA & HAYASHI 2012), combined with the mirine generic name Lygus   ; masculine.

Distribution. India (Darjeeling) ( YASUNAGA et al. 2012), SW Japan (Kyushu) (new record), Nepal ( YASUNAGA et al 2012), P. R. China (Fujian, Guanxi, Shaanxi, Sichuan, Yunnan, Zejiang) ( LU & ZHENG 1998a, YASUNAGA et al 2012, ZHENG et al. 2004), Taiwan ( ZHENG et al. 2004), and N. Thailand (new record).

Discussion. Miyamotolygus   is reminiscent of Neolygus   (as the type species was described under this taxon), but the following characters clearly distinguish this new genus from Neolygus: Darkened   extreme apices of clavus, embolium and cuneus (shared by Anthophilolygus   ); shorter labium slightly exceeding apex of mesocoxa; broadly reddish brown metafemur; apex of left paramere hypophysis with a lateral process (shared by Apolygopsis   , Micromimetus   and Prolygus   ); endosoma with bundles of distinct hair-like spinules ( Fig. 161 View Figs 159–169 ); elongate, flattened endosomal primary (PL) and secondary (SL) lobal-sclerites ( Fig. 161 View Figs 159–169 ) that are not arising from cup-like endosomal base ( Fig. 175 View Figs 170–177 , EDB); female bursa copulatrix with toughly sclerotized genital chamber ( Fig. 162 View Figs 159–169 vs. Fig. 176 View Figs 170–177 ); posterior wall rather similar in general shape to that of Apolygus   , with small, triangular interramal lobe and heavily sclerotized anterior margin of lateral lobe ( Fig. 163 View Figs 159–169 vs. Fig. 177 View Figs 170–177 ). The similarities between the present new genus and Neolygus   are considered only superficial.

As mentioned above, Miyamotolygus   has some characters shared by Anthophilolygus   , Apolygus   , Apolygopsis   , Micromimetus   and/or Prolygus   . Currently, it seems difficult to elucidate the relationship of Miyamotolygus   to these genera. Judging from sharing the pale green body with darkened extreme apices of clavus, cuneus and embolium, dark reddish brown apical part of metafemur, and presence of hair-like spinules on the endosoma, Anthophilolygus   is presumed to be the closest taxon among known mirine genera. However, the definitive systematic position will depend on the acquisition of DNA sequence data.

In addition to the type species, two additional species originally described from continental China under Neolygus   are also transferred here to Miyamotolygus   .