Iridothrips mariae Pelikan

(Figs 2, 3)

Iridothrips mariae Pelikan, 1961: 64 .

Previously this genus included two semiaquatic European species, iridis and mariae, which are associated with Typha and Iris, respectively, but the former species is distributed in North America (Stannard, 1968; zur Strassen, 2003; Jenser, 2013). Recently, however, Wang et al. (2019) revised this genus based on phylogenetic analysis of Frankliniella genus-group using morphological data. They recognized five Palaearctic species in Iridothrips and provided an identification key to these species. Their analysis suggested this genus is sister-group to Frankliniella supported by four homoplastic characters. In Europe, mariae breeds on Typha, but in Japan it breeds on the basal stems of Colocasia and Eichhornia as well as on Typha . Japanese individuals usually have pore plate-like structures on female sternites III–VI but one female from Typha of Honshu has no such structure, as in European females.

Specimens examined. JAPAN: Ryukyus: Okinawa-ken, Okinawa-hontou Is., Ginowan-shi, Ohyama: 6 females & 3 males on stem of Colocasia esculenta [ Araceae], 17.x.2004, K. Minoura; 52 females & 4 males & 3 second instar larvae on stem of Colocasia esculenta, 23.ii.2007, M. Masumoto; 21 females & 7 males on stem of Colocasia esculenta, 30.x.2009, M. Masumoto; 20 females & 7 males on stem of Typha sp. [ Typhaceae], 21.ix.2014, K. Minoua; 3 females on Eichhornia crassipes [ Pontederiaceae], 25.ix.2014, K. Minoura. Honshu: Chiba-ken, Chibashi, Konakadai-machi, 2 females & 1 male on bottom part of Typha latifolia, 26.vi.2011, R. Igarashi. Ibaraki-ken, Hokota-shi, Touma, 1 male on Typha latifolia, 26.viii.2013, M. Masumoto. All are deposited in TUA. POLAND: Warsaw, Ursynov, 4 females on Typha sp., 4.x.1985, Irena Zawirska (NHM).