Schizomyia castanopsisae Elsayed & Tokuda

Elsayed, Ayman Khamis, Yukawa, Junichi & Tokuda, Makoto, 2018, A taxonomic revision and molecular phylogeny of the eastern Palearctic species of the genera Schizomyia Kieffer and Asteralobia Kovalev (Diptera, Cecidomyiidae, Asphondyliini), with descriptions of five new species of Schizomyia from Japan, ZooKeys 808, pp. 123-160 : 132

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Schizomyia castanopsisae Elsayed & Tokuda

sp. n.

Schizomyia castanopsisae Elsayed & Tokuda View in CoL sp. n. Figs 30-36, 37-42; Table S2

Characters as in S. achyranthesae except for the following:


The species name, castanopsisae, is based on the generic name of the host plant, Castanopsis sieboldii ( Fagaceae ).

Type material.

Holotype: 1♂ (KUEC): reared from a larva obtained from an inflorescence gall on C. sieboldii by A. K. Elsayed, collected from Hachijojima Island on 6.xii.2014, T. Kikuchi leg., emerged on 24.ii.2015. Paratypes: All paratypes were reared by A. K. Elsayed from inflorescence galls on C. sieboldii in Japan. 2 larvae: collected from Hachijojima Island on 6.xii.2014, T. Kikuchi leg., departed from galls on 22.xii.2014; 5 larvae: collected from Hachijojima Island on 6.xii.2014, T. Kikuchi leg., departed from galls on 25.xii.2014; 6 pupal exuviae, 2♀, 3♂: collected from Shikinejima Island on 10.xii.2014, M. Tokuda leg., emerged between 24. i– 20.ii.2015; 3 pupal exuviae, 4♀, 2♂: collected from Hachijojima Island on 6.xii.2014, T. Kikuchi leg., emerged between 20. ii– 5.iii.2015.


Head (Fig. 30): Fronto-clypeus with 10-16 setae (n = 6). Palpus: first segment ca 43 μm, second 1.4 times as long as the first, third 1.5 as long as the second, fourth 1.2 as long as the third.

Thorax: Wing (Fig. 33) length 2.04-2.74 mm (n = 6) in female, 2.04-2.56 mm (n = 4) in male. Anepimeral setae 8-15 (n = 8); mesanepisternum scales 15-26 (n = 7); lateral scutum setae 15-27 (n = 8). Lengths of leg segments as in Suppl. material 1: Table S2.

Female abdomen (Figs 35, 36): Sternite VII about 3 times as long as preceding. Ovipositor: protrusible needle-like portion about 3.3 as long as sternite VII.

Male abdomen: Terminalia (Figs 37, 38): Gonocoxite length about 3.3 times as long as gonostylus.

Mature larva: Sternal spatula (Fig. 39) with posterior portion about 2.8 times as wide as the base of the anterior free portion. Anus opening branched (Fig. 40).

Pupa (Fig. 42): Prothoracic spiracle 280-330 μm long (n = 6).


Japan: The Izu Islands (from Niijima to Aogashima) ( Tokuda et al. 2012a, b, 2013, 2015, Tokuda and Kawauchi 2013a), Kyushu (Kagoshima and Miyazaki Prefectures) ( Nagai 2010, Tokuda and Kawauchi 2013b), Tanegashima Island ( Yukawa et al. 2013) and Okinawa-honto Island (Yamauchi et al. 1982).

Gall and life history.

Castanopsis sieboldii inflorescences galled by S. castanopsisae are rather irregularly swollen, 5.7-15.7 mm in diameter and 6.2-30.9 mm in length (Fig. 2) [Gall No. C-163 in Yukawa and Masuda (1996)]. Each gall consists of up to 30 chambers and each chamber contains a single larva. Mature larvae of S. castanopsisae left the galls collected in the Izu Islands in December within few days after the collection. Larvae were kept with soil in the laboratory and adults emerged the following January, February and March.


Schizomyia castanopsisae is morphologically close to S. asteris , S. achyranthesae and S. diplocyclosae . Schizomyia castanopsisae can be separated from S. asteris by a shorter ovipositor (protrusible needle-like portion 3.3 times as long as sternite VII, while 5.7 times in S. asteris ), the presence of dorsal setae on the gonostyli, and the tooth of gonostylus, which extends more dorsally than in that of S. asteris ; from S. achyranthesae by a shorter ovipositor (four times as long as sternite VII in S. achyranthesae ), more posteroapically pointed gonocoxite, and branched anal opening of larva; and from S. diplocyclosae by shorter empodia than tarsal claws (empodia are as long as claws in S. diplocyclosae ) and the number of larval anal papillae (four in S. castanopsisae while two in S. diplocyclosae ).