Syntomium japonicum Watanabe et Shibata, 1960

Ryvkin, Alexandr B., 2014, Notes On Distribution And Taxonomy Of Some Far Eastern Staphylinidae (Coleoptera), Acta Biologica Universitatis Daugavpiliensis 14 (2), pp. 177-185 : 178-179

Syntomium japonicum Watanabe et Shibata, 1960

(Figs. 4–5)

japonicum Watanabe & Shibata, 1960: 103 japonicum ; Watanabe & Shibata, 2013: 221

(For other important references on S. japonicum see Watanabe & Shibata, 2013: 221)

Material. JAPAN: 1 female (AR): Mt. Hinodeyama, Hinode-machi, Nishitama , Tokyo. 18.09.2011. Y.Shibata leg. — 1 male (AR): same locality and collector. 10.07.2012 .

Remarks. In the detailed and informative redescription undertaken by the authors of the species last year ( Watanabe & Shibata, 2013), the general shape of the aedeagus was provided in three good figures. Unfortunately, the figures are somewhat generalized and the structure of endophallus has not been shown there. In addition, no comparison with the second Far Eastern species of the genus, Syntomium marusiki Ryabukhin, 1992 , has been made in the Comparative notes section; only westpalaearctic S. aeneum (P.Müller, 1821) has been mentioned there. I am very glad that comprehensive information and the liberal gift of the aforecited specimens of S. japonicum received by me from Dr. Yasutoshi Shibata enables me to fill up the gap in the knowledge of these matters.

The lanceolate median lobe is moderately incurved dorsally, about as long as parameres, with an indistinct preapical keel on the dorsal side. The endophallus is represented by the paired medial longitudinal bands conjoined distally, with feebly sclerotized scattered internal denticles and fringe of rather dense but vague cilia; a long thin flagellum, coiled in a Fig.1–5. ― Male genitalia of Syntomium spp. 1 –3. S. marusiki Ryabukhin, 1992 (1: Ust’-Urgal, 2–3: Levaya Bureya River): aedeagus (1–2: laterally, 3: ventrally). 4–5. S. japonicum Watanabe et Shibata, 1960 (Tokyo): aedeagus (4: ventrally, 5: laterally). Scale = 0.1 mm.

spiral within the phallobase, lies in its distal part between the longitudinal bands.

External differences from Syntomium marusiki Ryabukhin, 1992 are given in the key below.

The species is known only for Japan excluding Hokkaido and Ryukyu islands till now ( Watanabe & Shibata, 2013).