Pleroneura hikosana Togashi, 1972,

Shinohara, Akihiko, 2016, The sawfly genus Pleroneura (Hymenoptera, Xyelidae) of Japan: P. itoi n. sp. and a key to species, Zootaxa 4121 (4), pp. 495-500: 496

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Pleroneura hikosana Togashi, 1972


Pleroneura hikosana Togashi, 1972 

( Figs 1View FIGURE 1 A, B, 2 A, B, G)

Pleroneura hikosana Togashi, 1972: 53  ; Shinohara, 1995: 835; Kurokawa, 1996: 8; Shinohara, 1996: 728. See Shinohara (1995) for more references.

Material examined. ♀, Uchiurayama course, Mt. Kiyosumiyama, Kamogawa, Chiba, 17. IV. 2 0 0 5, K. Kubo.

Distribution. Japan (Honshu, Kyushu).

Host plant. Unknown.

Remarks. Pleroneura hikosana  was described from Mt. Hikosan, Fukuoka prefecture, northern Kyushu, Japan, based on a female holotype and a male paratype. Kurokawa (1996, published November 15) and Shinohara (1996, published December 25) independently published “the first record” of P. hikosana  from Honshu, the former based on a female from Mt. Asuwayama, Fukui prefecture, and the latter based on a female from Mt. Tokusagamine, Yamaguchi prefecture, both localities in western Honshu. These four are the only specimens of P. hikosana  recorded so far. The present discovery of P. hikosana  in Chiba prefecture expanded the known distributional range of the species by about 370 km eastwards.

The collection sites of this species, as understood from the label data, are lower mountains. The altitude of the highest peak of Mt. Hikosan is 1199 meters, that of Mt. Tokusagamine is 989 meters, whereas that of Mt. Asuwayama is only 116 meters and that of Mt. Kiyosumiyama is 377 meters. The host plants of the Pleroneura  species are Abies  spp. (Ohmart & Dahlsten 1977; Blank 2002), while one exceptional species, P. piceae  , is known to feed on Picea glehnii (F.Schmidt) Mast.  in Japan ( Shinohara 1995). Although we still have no direct evidence, the almost only candidate for the host plant of P. hikosana  is Abies firma Siebold et Zucc. This  fir species is widely spread on lower mountains of Honshu, Shikoku and Kyushu ( Liu 1971) and is the only Abies  species occurring at lower altitudes including both Mt. Asuwayama (Nakamura, personal communication) and Mt. Kiyosumiyama ( Kasuya & Sakura 1974). Pleroneura hikosana  should probably be distributed in association with A. firma  on lower mountains in Honshu, Kyushu, and probably also in Shikoku.

The Chiba female specimen ( Figs 1View FIGURE 1 A, B, 2 A, G) is the largest (about 6.8 mm, excluding the valvula 3) and the darkest specimen ever known. It has most of the dorsal surface of the head black, without a reddish brown marking on the lateral part of the vertex, which is conspicuous in the previously known specimens (e.g. a specimen from Mt. Tokusagamine, Fig. 2View FIGURE 2 B).














Pleroneura hikosana Togashi, 1972

Shinohara, Akihiko 2016

Pleroneura hikosana

Kurokawa 1996: 8
Shinohara 1996: 728
Shinohara 1995: 835
Togashi 1972: 53