Syntomium marusiki Ryabukhin, 1992

Ryvkin, Alexandr B., 2014, Notes On Distribution And Taxonomy Of Some Far Eastern Staphylinidae (Coleoptera), Acta Biologica Universitatis Daugavpiliensis 14 (2), pp. 177-185 : 179-180

Syntomium marusiki Ryabukhin, 1992

(Figs. 1–3)

marusiki Ryabukhin, 1992: 147

marusiki ; Ryabukhin, 1999: 35

marusiki ; Herman, 2001: 1332 Material. RUSSIA: AMUR AREA: 1 female (AR): Selemdzhinskiy District, Byssa River basin NW of “Tyoplyi Klyuch” spa, 300 m a.s.l., mosses and litter in afforested tussocks at depression: Carex spp. , Poaceae gen. spp., Polytrichum commune , Salix spp. , Alnus sp. , Rosa sp. , Spiraea spp. , etc. 21.06.2007. E.M.Veselova & A.B.Ryvkin leg.— KHABAROvSK TERRITORY: 1 male (AR): Verkhnebureinskiy District, left side of Olga River valley 3 km up-stream of Sofiysk, 880 m a.s.l., mosses, leaf litter & plant debris on gentle slope near rill amid mari with hummocks of Sphagnum spp. , Carex? globularis , C. spp., Poaceae gen. spp., Ledum sp. , Vaccinium uliginosum , V. vitis-idaea , Polytrichum sp. , Hypnum sp. , Hylocomium splendens , Fig. 6–9. ― Collecting localities of Lathrobium oharai Watanabe, 2004 in Bastak Nature Reserve. 6–7. Near 202 m bald mountain. 8–9. Kirga River basin.

Pleurozium schreberi , Ptilium crista-castrensis , Betula spp. , etc. 19.08.2008. A.B.Ryvkin leg.— 1 male (AR): Verkhnebureinskiy District, Ust’- Urgal Nature Park (project), right side of Bureya River below bald mountain 488 m, 260 m a.s.l., leaf litter and mosses on steep rocky slope with Acer ukurunduense , Betula platyphylla , Alnus sp. , Abies nephrolepis , etc., and mari ( Larix gmelinii , Ledum palustre , Sphagnum spp. , etc.) on terrace above flood-plain. 07.08.2009. A.B.Ryvkin leg.— 2 males (AR): Verkhnebureinskiy District, Bureinskiy Nature Reserve, right side of Levaya Bureya River up-stream of Imganakh River mouth, 750–850 m a.s.l., SW slope of mountain: moss and litter in spruce forest with Abies nephrolepis , Larix gmelinii , Rhododendron dauricum , Pyrola sp. , Rosa sp. , Swida alba , Vaccinium vitis-idaea , Oxalis acetosella , Maianthemum bifolium , Linnaea borealis , Poaceae gen. spp., Carex spp. , ferns, Hylocomium splendens , Pleurozium schreberi , Ptilium crista-castrensis , etc. along slope stream. 30.06.2011. A.B.Ryvkin leg.

Remarks. Originally described based on seven specimens from two localities in the Magadan Area. Terra typica: “ Magadan Area, 35 km northward of Magadan, Snezhnaya Dolina settlement”; Herman (2001) has provided a confused transliteration of the original (Cyrillic) text.The species is also recorded for Tordoki-Yani Mountain in the Sikhote-Alin Mountain Ridge ( Ryabukhin, 1999). When being described, this species was compared neitherwith S. japonicum nor with nearctic S. confragosum Mäklin, 1852 known from Alaska, British Columbia, Alberta, and Quebec ( Campbell & Davies, 1991). The figures of the aedeagus are too sketchy and seem indistinguishable from those of S. japonicum .

The specimens I have on hand (see above) correspond well with the original description of S. marusiki ; that makes it possible to redescribe its aedeagus which is of basically the same structure that in the preceding species but has some peculiarities of definitely specific rank. The median lobe is long and narrow, more strongly incurved to the dorsal side, uniformly narrowed distally, short roundly truncated at the very apex, without any keels on the dorsal side; the parameres a bit longer than the median lobe. The endophallus with the longitudinal bands more distant from one another along nearly the whole of their length, with internal structures membranous, less evident, without distinct denticles or spikes; the flagellum is of the similar shape as in S. japonicum .

The pronounced similarity in the structure of aedeagi between S. marusiki and S. japonicum along with their common distinction from S. aeneum indicates a close phylogenetic relationship of both Far Eastern Syntomium species in spite of the obvious external differences among them provided in the key below.