Stenus (Nestus) illusor Ryvkin, 1987

Ryvkin, Alexandr B., 2012, New species and records of Stenus (Nestus) of the canaliculatus group, with the erection of a new species group (Insecta: Coleoptera: Staphylinidae: Steninae), European Journal of Taxonomy 13, pp. 1-62 : 35-36

Stenus (Nestus) illusor Ryvkin, 1987

( Figs. 5B , 7B )

Stenus (Nestus) illusor Ryvkin, 1987: 155 .

Material examined

RUSSIA: 1 ♀, Amur Area, Selemdzhinskiy District , Selemdzha River basin , Angelokit River , 52°53.497’N 132°24.543’E, 430 m a.s.l., mosses and litter under Salix spp. and Alnus sp. with Poaceae gen. sp., Sphagnum squarrosum, Sph. sp., Plagiomnium sp., etc. in flood-plain, 3 Jul. 2007, E.M. Veselova & A.B. Ryvkin leg. ( AR) . – 1 ♂, Amur Area, Selemdzhinskiy District , Selemdzha River basin , Angelokit River near mouth , 52°53.49’N 132°24.5’E, 420 m a.s.l., mosses and litter under Populus sp., Padus sp., Alnus sp., Abies nephrolepis , Picea ajanensis , etc. with Spiraea spp., Swida alba, Rosa sp., Rhododendron sp., sparse Betula platyphylla , Poaceae gen. spp., Carex spp., Smilacina davurica , Pyrola daurica , Trientalis europaea , etc. in flood-plain forest , 4 Jul. 2007, E.M. Veselova & A.B. Ryvkin leg. ( AR) ; 1 ♀, Amur Area, Selemdzhinskiy District , left side of Selemdzha River , 3 km below Butov Kamen’ rapid, gorge with waterfall, 52°50.94’N 132°11.44’E, 400 m a.s.l., mosses and litter on stones and rocks near, above and below the waterfall, 8 Jul. 2007, E.M. Veselova & A.B. Ryvkin leg. ( AR) . – 1 ♂, Khabarovsk Territory, Verkhnebureinskiy District , island on Niman River 700 m upstream of Niman cordon of Bureinskiy Nature Reserve, 1040 m a.s.l., mosses and leaf litter in floodplain forest with Populus sp., Salix sp., Spiraea spp., Sorbaria sorbifolia , Poaceae gen. spp., Carex spp., Sphagnum sp., Polytrichum sp., Hylocomium splendens , etc., 11 Aug. 2008, A.B. Ryvkin leg. ( AR) ; 1 ♂, 1 ♀, Magadan Area, 2 km W of Splavnaya, №236, 2 Sep. 1981, A. Ryabukhin leg. ( AR) ; 1 ♀, Magadan Area, 35 km N of Magadan, №184, 16 Aug. 1981, A. Ryabukhin leg. ( AR) ; 1 ♀, same locality, №194, 20 Aug. 1981, A. Ryabukhin leg. ( AR) ; 1 ♀, Kamchatka, Esso, flood-plain of Bystraya River , 27 Jun. 1975, B.A. Korotyayev leg. ( AR) ; 1 ♀, Chukot Peninsula, Anadyr River basin , Novyi Yeropol , middle flood-plain , osier-bed with Poaceae on silty clay sand: soil trap, 15 Jul. 1986, E.G. Matis leg. ( AR) .

Remarks

The species was previously known only for the male holotype: ‘Khabarovsk Territory, Amur basin, Lyanchli River, confluent of Gorin River, 5.ix.1975, O.N. Kabakov leg.’ (ZIN). Based on the new material, I regard it as being widely distributed across the Russian Far East, except the southernmost territories.

Figures

Fig. 5. ♂ copulative structures. A–E: Abdominal sternite 9. A. Stenus (Nestus) latipennis J. Sahlberg, 1880 (Russia: Krasnoyarsk Territory: Mirnoye). B. S. (N.) illusor Ryvkin, 1987 (Russia: Magadan Area: 2 km W of Splavnaya). C. S. (N.) delitor sp. nov. (holotype). D. S. (N.) canosus sp. nov. (holotype). E. S. (N.) canalis sp. nov. (holotype). F. S. (N.) caseyi Puthz, 1972 (U.S.A.: Michigan: Berrien Co.). Aedeagus, ventral view. – Scales = 0.1 mm.

Fig. 7. ♂ copulative structures. A–I, K: Aedeagus, ventral view. J: Abdominal sternite 9. A. Stenus (Nestus) delitor sp. nov. (holotype). B. S. (N.) illusor Ryvkin, 1987 (Russia: Amur Area: Angelokit River). C–H: S. (N.) latipennis J. Sahlberg, 1880. C. (Russia: SW Taimyr: Ladannakh Lake). D. (Russia: Taimyr: Kotuy River). E. (Russia: Putorana: Ayan Lake). F–G. (Russia: Evenkia: Kruten’kiy Stream). H. (Russia: Magadan Area: ‘Aborigen’). I–J. S. (N.) sphaerops Casey, 1884 (U.S.A.: New York: Albany Co.). K. S. (N.) melanopus Marsham, 1802 (Ukraine: Odessa Area: Krinichnoye). – Scales = 0.1 mm.