Neohydatothrips elaeagni (Kudo)

Masumoto, Masami & Okajima, Shûji, 2020, Two new species of Neohydatothrips John (Thysanoptera, Thripidae) from Japan with a record of micropterous N. elaeagni (Kudo), Zootaxa 4869 (3), pp. 404-412 : 407-408

Neohydatothrips elaeagni (Kudo)

( Figs 2, 3 , 16 & 17 )

Hydatothrips (Neohydatothrips) elaeagni Kudo, 1991: 535 .

Neohydatothrips popli Han, 1991: 449 . [Synonymized by Wang, 2007.]

This species was described from Elaeagnus umbellata [ Elaeagnaceae ] based on the macropterous female in Hokkaido, Japan, and Han (1991) described N. popli , which was synonymized by Wang (2007), from Populus sp. [ Salicaceae ] based on both sexes. Thereafter, it has been collected from not only Elaeagnus but also Salix [ Salicaceae ] in Honshu. Moreover, micropterous females were recorded in Honshu ( Okajima 2000) but their character states have never been described so far. The micropterous and macropterous females of N. elaeagni have almost same character states, but in the micropterous form the abdominal tergites II–VIII are almost uniformly covered with microtrichia, the discal setae are shorter than on the macropterous form, and all the tergites have posteromarginal microtrichia ( Fig. 17 ). In the macropterous form the abdominal tergites have no microtrichia posteromedially and posteromarginal microtrichia are absent between S2 setae except on tergite VIII. Thus, the micropterous form is similar to species of Sericothrips . However, it can be distinguished from Sericothrips by the metanotum without microtrichia, abdominal tergite I without microtrichia medially and tergites II–VIII with S1 setae not similar in size and position. In the micropterous form of N. abnormis , the fore wing is longer than the width of the mesothorax, but in N. elaeagni the fore wing is lobe-like and much shorter than the width of thorax ( Figs 8 & 16 ). Sericothrips looks like micropterous form of Neohydatothrips (also see, Lima & Mound 2016b), but molecular data Buckman et al. (2013) suggested that Neohydatothrips was sister group of Hydatothrips rather than Sericothrips , although only three species of these three genera were included in that analysis.

Specimens examined. JAPAN: Honshu: Iwate-ken, Morioka-shi, nr. Shijyushida-damu; 24 females (mic) on leaves of Salix integra [ Salicaceae ], 64 females (mic) on Elaeagnus sp. [ Elaeagnaceae ], 11.v.1999, T. Nonaka (TUA). Tokyo-to, The Imperial Palace Grounds, Fukiage-gyoen, 30 females (24 mac & 6 mic), 30.iv.1999, S. Okajima (TUA). Kanagawa-ken, Yokohama-shi, Kanazawa-shizen park, 62 micropterous females on Elaeagnus umbellata [ Elaeagnaceae ], 1.v.2005, M.Masumoto (TUA). Hiroshima-ken, Mihara-shi, Hongou-cho, 9 micropterous females on Elaeagnus umbellata [ Elaeagnaceae ], 4.v.2008, Y.Kojima (TUA).

Figures

FIGURES 1–9. Neohydatothrips species. (1) N. bicolor sp. n., female. N. elaeagni, female, 2–3: (2) Microptera; (3) Macroptera. N. fascipennis sp. n., 4–5: (4) Female; (5) Male. (6) N. samayunkur, female; (7) N. bicolor, sp. n., female; (8) N. elaeagni, female microptera; (9) N. fascipennis sp. n., male.

FIGURES 10–17. Neohydatothrips species. N. bicolor sp. n., female, 10–15: (10) Head–metanotum; (11) Antenna; (12) Metasternum; (13) Fore wing; (14) Abdominal tergites VI-XI; (15) Abdominal sternite V. N. elaeagni, female microptera, 16–17: (16) Meso- & metanota; (17) Abdominal tergites V–VI.