Myiomma austroccidens Yasunaga, Yamada & Tsai, 2017

Yasunaga, Tomohide, Yamada, Kazutaka & Tsai, Jing-Fu, 2017, Taxonomic review of the plant bug subfamily Isometopinae for Taiwan and Japanese Southwest Islands, with descriptions of new taxa (Hemiptera: Heteroptera: Miridae: Isometopinae), Zootaxa 4365 (4), pp. 421-439 : 424

Myiomma Puton, 1872

Myiomma austroccidens Yasunaga, Yamada & Tsai sp. nov. — Taiwan (Nantou, Taichung), Ryukyus (Amami- Oshima) and Yakushima Island—Unknown.

Myiomma choui Lin & Yang, 2004 — Taiwan (Hualien, Nantou)—Unknown.

Myiomma kentingense Yasunaga, Yamada & Tsai sp. nov. —Taiwan (Nantou, Pingtung)— Fraxinus griffithii (tree trunk).

Myiomma minutum Miyamoto, 1965 ( Figs 2E–F , 4H–I , 9F–G )—Ryukyus (Ishigaki and Iriomote Islands)—Several adults were found on Fraxinus griffithii on Ishigaki Island. Note: The live individuals ( Fig. 2E–F ) of this species are shown for the first time. Myiomma minutum can be distinguished from the assumed closest congener, M. samuelsoni , by the almost uniformly dark or reddish brown metafemur (cf. Fig. 4H ).

Myiomma samuelsoni Miyamoto, 1965 ( Fig. 4F–G , 7G–I )—Ryukyus (Okinawa, Ishigaki and Iriomote Islands)— Both adults and nymphs were found on Fraxinus griffithii . Note: Lin & Yang (2004, 2005 for the male genitalia) reported this taxon from Taiwan, based on examination of 13 specimens collected using Malaise traps at Wanfeng, Taichung. However, our recent examination revealed that these specimens do not correspond to M. samuelsoni but represent an undescribed species ( M. austroccidens sp. nov., see below descriptions). Accordingly, M. samuelsoni is excluded from Taiwanese fauna.

Myiomma takahashii Yasunaga & M. Hayashi, 2002 ( Fig. 4J )—Ryukyus (Ishigaki Island)—This species is known to inhabit the trunk of Fraxinus griffithii , where any of seven isometopines, M. Astroscopometopus gryllocephalus , Isometopus ishigaki , I. takaii , Kohnometopus fraxini , Myiomma takahashii , M. minutum and M. samuelsoni , frequently co-occur ( Yasunaga, 2001; 2005).

Myiomma zhengi Lin & Yang, 2004 — Taiwan (Hualien, Taitung, Taoyuan)—Unknown.

Figures

FIGURE 2. Live individuals of 5th instar nymph (A–B) and adults (C–H) of isometopines on Fraxinus griffithii. A. Isometopus bipunctatus Lin, female (photographed at Kenting, S. Taiwan). B. Ditto, male. C. Myiomma kentingense sp. nov., male (Kenting, S. Taiwan). D. Ditto, female. E. Myiomma samuelsoni, male (Ishigaki Island). F. Ditto, female. G–H. Kohnometopus fraxini Yasunaga, female (Ishigaki Island).

FIGURE 4. Dry-preserved specimens of Myiomma species. A. Myiomma austroccidens sp. nov., holotype male from Yakushima Island. B. Ditto, male from Amami-Oshima Island. C. Ditto, female (Yakushima). D. Ditto, ventral view (holotype male = A).E. Ditto, female.F. M. samuelsoni Miyamoto, male from Okinawa Island. G. Ditto, femalefrom IshigakiIsland. H– I. Myiomma minutum Miyamoto, female from Ishigaki Island. J. Myiomma takahashii Yasunaga & Hayashi, female from Ishigaki Island.K. Myiomma kentingense, male, ventral view. L. Ditto, female.

FIGURE 7. Scanning electron micrographs of Myiomma spp. A. M. austroccidens sp. nov., male from Amami-Oshima, left lateral view. B. Ditto, metathoracic scent efferent system (left). C. Ditto, pygophore with left paramere, ventral view. D. M. kentingense sp. nov., male from Pingtung, Taiwan, dorsal habitus. E. Ditto, ventral view.F. Ditto, protarsus. G. M. samuelsoni Miyamoto, female from Ishigaki Island, dorsal view. H. Ditto, male from Okinawa Island, ventral view. I. Ditto, male, dorsal view.J. Ditto, metatarsus.

FIGURE 9. Distributions of mesofemoral (A, C, E-left & F) and metafemoral (B, D, E-right & G) trichobothria of Astroscopometops grillocephalus (Miyamoto, Yasunaga & Hayashi) (A–B) Kohnometopus fraxini Yasunaga (C–D), Alcecoris cochlearatus sp. nov. (E), and Myiomma minutum Miyamoto (F–G), ventral view. Scale bars 0.2 mm.