Synstrophus repandus ( Horn, 1888 )

Pollock, Darren, 2008, Review of the Canadian Eustrophinae (Coleoptera, Tetratomidae), ZooKeys 2 (2), pp. 261-290 : 282-286

Synstrophus repandus ( Horn, 1888)

( Figs 7 , 14 , 23, 25 , 31 )

Eustrophus repandus Horn, 1888: 33 .— Csiki, 1924: 9; Hatch, 1965: 66, Plate VIII, fig. 9; LeSage, 1991: 246; Poole and Gentili, 1996: 300; Young and Pollock, 2002: 416. Lectotype, sex unknown, labelled “Pen / LectoTYPE / Eustrophus repandus Horn / MCZ Type 34039”, in MCZ. Paralectotypes (3), in MCZ.

Diagnosis The smooth meso- and metatibiae (no oblique ridges), overall dark body color, and narrowly separated eyes serve to separate this species from all other Nearctic Eustrophinae .

Description TL 5.6-7.0 mm; GEW 2.5-3.4 mm. Body ( Fig. 7 ) ovate, only somewhat tapered posteriorly; dorsal color dark piceous to black; antennae with basal 4 antennomeres dark rufous, distal half of antennomere 11 rufous; venter at least slightly lighter in color than dorsum; mouthparts similar in color to antennomeres 1-4; legs and abdominal ventrites dark rufous to piceous; dorsal pubescence relatively long, conspicuous; eyes ( Fig. 14 ) narrowly separated, or almost contiguous (space <length of antennomere 1), inner margin moderately emarginate; antennomeres ( Fig. 23 ) 2-4 short, submoniliform; antennomeres 5-10 widened, becoming more triangular toward antennomeres 9-10; antennal sensilla completely annular ( Fig. 25 ); last maxillary palpomere unmodified, fusiform; procoxal process triangular, narrowed distally, extended to slightly short of posterior margin of procoxae; prothoracic episternal suture absent; elytral punctation coarse, punctures arranged in longitudinal striae ( Fig. 7 ); meso- and metatibiae with scattered short spines, but distinct ridges absent (as in Fig. 15 ).

Distribution ( Fig. 27 ) Th e distribution of this species is very similar to that of E. tomentosus , in that most specimens are known from British Columbia and southern Ontario and Quebec, with a few localities in Manitoba. No specimens of this species have

been seen from Alberta or Saskatchewan. US distribution: AL, AR, CA, CT, DC, DE, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NY, OH, OK, OR, PA, SC, SD, TX, UT, VA, WA, WI, WV, WY.

Natural history Label data: Pinus ponderosa bark (BC), shelf fungus on birch (BC), fungus on cottonwood (BC), Populus trichocarpa (BC), ex fungus on Betula (BC), underside of Populus trichocarpa log (BC), fleshy bracket fungus (ON), under wet moldy bark on dead tree (ON), Pleurotus ostreatus (IL, MA, PQ), polypore on branch of old Quercus rubrus (PQ), under dead pine bark (AL), Meripilus giganteus (AR), ex fungi and under bark (FL), large mushroom on log (IL), Polyporus adjustus (IL), Laetiporus sulphureus (IL), under Pinus bark (LA), ex bracket fungi (NC), in slimey fungus under pine bark (NY), under dead bark (SC), ex. Polyporus schweinitzii (VT), under bark of pine (WY).

Material examined Specimens were seen from the following Canadian localities: BRITISH COLUMBIA: 5 km SW Radium, 24.VIII.1987, B.F. & J.L. Carr, lot 1, ( CARR, 2) ; same locality, 24.VIII.1987, B.F. & J.L. Carr, lot 1, ( DAPC, 3) ; Radium , 24.VII.1987, B.F. & J.L. Carr, ( GJHC, 5) ; 7 mi E. Terrace , 26-27.VI.1968, Campbell & Smetana, ex river debris, ( CNC, 1) ; Copper Mountain , 21.VIII.1927, G. Stace Smith, ( JBWM, 3) ; Copper Mtn. , 21.VIII.1927, G. Stace Smith, Pinus ponderosa bark, ( UBC, 4) ; Creston , 11.V.1958, H. & A. Howden, shelf fungus on birch ; 1 spec. slightly teneral, ( CNC, 8) ; same locality, 14.V.1958, H. & A. Howden, fungus on cottonwood, ( CNC, 1) ; same locality, 6.IX.1951, G. Stace Smith, ex fungus, ( UBC, 1) ; same locality, 16. VIII.1951, G. Stace Smith, ex fungus, ( UBC, 1) ; same locality, 7.IX.1951, G. Stace Smith, ex fungus, ( UBC, 1) ; same locality, 25.X.1951, G. Stace Smith, under log, ( UBC, 1) ; same locality, 21.V.1951, G. Stace Smith, Populus trichocarpa , ( UBC, 1) ; same locality, 12.X.1951, G. Stace Smith, ex fungus, ( UBC, 1) ; same locality, 17.V.1951, G. Stace Smith, ex fungus, ( UBC, 1) ; same locality, 20.X.1951, G. Stace Smith, logs, ( UBC, 1) ; same locality, 23.V.1951, G. Stace Smith, ex fungus on Betula , ( UBC, 1) ; same locality, 26.V.1951, G. Stace Smith, ex fungus on Betula , ( UBC, 2) ; same locality, 9.IX.1951, G. Stace Smith, ex fungus, ( UBC, 1) ; same locality, 22.VII.1933, G. Stace Smith, underside of Populus trichocarpa log, ( UBC, 1) ; same locality, 12.X.1946, G. Stace Smith, in fungus, ( UBC, 1) ; same locality, 8.VI.1950, G. Stace Smith, ex fungus Populus trichocarpa , ( UBC, 1) ; same locality, 23.VII.1948, G. Stace Smith, from fungus, ( UBC, 1) ; same locality, 18.V.1948, G. Stace Smith, from fungus, ( UBC, 2) ; same locality, 7.XII.1931, G. Stace Smith, on cordwood, ( UBC, 1) ; same locality, 22.VII.1948, G. Stace Smith, from fungus, ( UBC, 2) ; Creston , 2200 ft., 18.III.1933, G. Stace Smith, decaying wood of Pinus ponderosa , ( UBC, 1) ; Gabriola , 2.VI.1994, B.F. & J.L. Carr, lot 7, ( CARR, 1; GJHC, 1) ; same locality, 29.IV.1993, B.F. & J.L. Carr, lot 1, ( CARR, 1) ; same locality, 29.V.1994, B.F. & J.L. Carr, lot 8, ( CARR, 3) ; same locality, 10.IX.1992, B.F. & J.L. Carr, lot 2, ( CARR, 1) ; Haney , 2.VII.1962, B.F. & J.L. Carr, lot 1, ( CARR, 1) ; Lockhart Beach , Kootenay Lk., 12.VI.1962, C.W. O’Brien, ( MCZ, 1) ; Midday Val. Merritt , 21.VI.1926, W. Mathers, ( CNC, 1) ; same locality, 20.IV.1926, R. Hopping, old stumps of P. ponderosa , ( CNC, 1) ; same locality, 12.VII.1925, K.F. Auden, ( CNC, 2) ; Midday Valley, Merritt , 4-7.VI.1924, K.F. Auden, ( INHS, 4) ; same locality, 7.VI.1924, K.F. Auden, ( MCZ, 1) ; same locality, 4.VI.1924, K.F. Auden, ( PFC, 1) ; same locality, 11.VII.1925, K.F. Auden, ( PFC, 1) ; same locality, 3.IX.1925, W. Mathers, Pinus ponderosa , ( PFC, 1) ; same locality, 10.VI.1926, H.H. Th omas, ( PFC, 1) ; Mirror Lake , 10.VI.1984, B.F. & J.L. Carr, lot 2, ( CARR, 1) ; Salmon Arm , 27.III.1929, H.B. Leech, ( UBC, 1) ; same locality, v.1934, D.H. Leech, ( UBC, 1) ; same locality, 22.V.1932, H. Leech, fungus, ( UBC, 1) ; Sanca , 8.VIII.1933, G. Stace Smith, on stone wall, ( UBC, 1) ; Sleeping Beauty Mtn. , NE Terrace, 1800 m., 1.VII.1987, D. & K. Larson, ( MUNC, 1) ; Tappen , 3.VI.1978, B.F. & J.L. Carr, lot 1, ( CARR, 9; GJHC, 3) ; same locality, 3.VI.1978, B.F. & J.L. Carr, lot 1, ( DAPC, 1) ; Vancouver , 15.III.1896, ( CMNH, 5) ; Vancouver Island , 15.III.1899, ( UMRM, 1) ; Victoria , ( INHS, 2) ; Wynndel, 13.V.1958, H. & A. Howden, ( CNC, 1). MANITOBA: Aubigny , 24.VIII.1987, J.E. Blatta, ( JBWM, 2) ; Aweme , 20.VI.1910, E. Criddle, ( JBWM, 1) ; Sandilands Res , 5 J 1938, D.N. Smith, ( CNC, 1) ; Winnipeg, University of Manitoba campus, honey house, 10-17.VI.1991, R.E. Roughley, suction trap, ( JBWM, 1). ONTARIO: no other data, ( MCZ, 1) ; Bell’s Corners , 17.X.1962, D.D. Munroe, ( CNC, 1) ; Brant Co., Pinehurst Cons. Area, Hwy 24A, n. of Paris , 21.V.1971, H. Frania, in fleshy bracket fungus in woods, ( ROME, 5) ; Chalk River , 18.VII.1985, J.V.R. Chenier, ( CMNC, 1) ; Constance Bay , 4.IX.1965, D.D. Munroe, ( CNC, 1) ; Dunn Twp , 1.IX.1971, W.W. Judd, ( CNC, 1) ; Essex Co. , Point Pelee Natl. Pk. East beach, 8.VI.2000, E. Reichert, ( DEBU, 1) ; same locality, [8.VI.2000], O. Lonsdale, under bark, ( DEBU, 1) ; Essex Co., Windsor , ̴ 1.5km S Ojibway Prairie, 1-19.VIII.2001, P. Pratt, prairie remnant, forest edge, malaise trap, ( DEBU, 1) ; Fitzroy Hbr , 31.V.1965, D.D. Munroe, ( CNC, 1) ; Grand Bend , 22.VI.1936, A.A. Wood, ( CNC, 1) ; Hamilton , 3-17. VI.1982, M. Sanborne, ( CNC, 1) ; same locality, 31.VII.1980, M. Sanborne, ( CNC, 1) ; same locality, 7.VI.1981, M. Sanborne, ( CNC, 4) ; same locality, 28.VIII.1980, M. Sanborne, ( CNC, 3) ; same locality, 14-19.VII.1981, M. Sanborne, ( CNC, 1) ; same locality, 14-21.VI.1981, M. Sanborne, ( CNC, 1) ; same locality, 9-19.IX.1981, M. Sanborne, ( CNC, 1) ; same locality, 16.VII.1980, M. Sanborne, ( CNC, 1) ; same locality, 28.VI-14. VII.1982, M. Sanborne, ( CNC, 1) ; same locality, 23.VII.1980, M. Sanborne, Malaise trap, ( CNC, 1) ; same locality, 27.VII-9.VIII.1982, M. Sanborne, ( CNC, 2) ; same locality, 23.V-3.VI.1982, M. Sanborne, ( CNC, 1) ; same locality, 14-26.VII.1982, M. Sanborne, ( CNC, 1) ; Lambton Co., Pinery Prov. Park, 20.VI.1994, J. Skevington, malaise Cedar trail oak savanna meadow, ( DEBU, 1) ; same locality, 26.VI.1994, J. Skevington, malaise Cedar trail oak savanna meadow, ( DEBU, 1) ; Ottawa , ( CNC, 4) ; same locality, 4.VIII, fungus, ( CNC, 1) ; same locality, 22.VIII.1912, Beaulieu, ( CNC, 1) ; same locality, 27.VIII.1912, Beaulieu, ( MCZ, 4) ; Peel Co., Bolton, 4.V.1978, R.S. Anderson, under bark, ( ROME, 1) ; Peel Co., Port Credit , 29.IV.1966, I.M. Smith, ( ROME, 3) ; same locality, 18.VII.1965, I.M. Smith, ( ROME, 1) ; same locality, 24.VII.1965, I.M. Smith, ( ROME, 1) ; same locality, 16.IV.1966, I.M. Smith, ( ROME, 2) ; Prince Edward Co., 30.IV.1922, Brimley, ( CNC, 1) ; same locality, 2.VI.1940, Brimley, ( CNC, 2) same locality, 1.VI.1930, Brimley, ( CNC, 1) ; same locality, 31.V.1942, Brimley, ( CNC, 1) ; same locality, 12.X.1919, Brimley, ( CNC, 1) ; same locality, 29.VI.1941, J.F. Brimley, ( FMNH, 1) ; Rainy River Dist. , 22.VI.1924, J.F. Brimley, ( CNC, 1) ; Reg.Mun. of Ottawa-Carleston Haldiman , 9.VI.1995, Brendon Larson, Twp. 5 km NW Centreton conch on dead Pop. Trem., ( DEBU, 1) ; Rondeau Pr. Pk., Black Oak Trail , 5.VI.1985, A. Davies & J.M. Campbell, under wet moldy bark on dead tree, ( CNC, 23) ; St. Thomas , 28.VII.1925, James, ( CNC, 1) ; Strathroy , 20.VI.1934, H.F. Hudson, ( CNC, 1) ; Sudbury , 1889, ( CNC, 1) ; Toronto , 20.XI.1895, R.J. Crew, ( CUIC, 2) ; same locality, 24.VIII.1895, R.J. Crew, ( CUIC, 5) ; same locality, 11.XI.1894, R.J. Crew, ( CUIC, 1) ; same locality, 31.VIII.1895, R.J. Crew, ( CUIC, 1) ; same locality, 24.XII.1894, R.J. Crew, ( CUIC, 2) ; same locality, 7.X.1978, R.S. Anderson, ( ROME, 2) ; Dundas , 16.V.1979, Dael Morris, ( DEBU, 1) ; Gananoque , 6.VII.1963, C.J. Edwards, ( DEBU, 1) ; Georgetown , 27.V.1988, R. Gagne, Malaise trap, ( DEBU, 1) ; Guelph , 9.V.1975, J.M. Heraty, ( DEBU, 4) ; same locality, 15.VII.1975, Sandra Allan, ( DEBU, 1) ; same locality, 25.VII.1982, W. Punchihewa, ( DEBU, 1) ; same locality, 17.VII.1976, S.A. Marshall, ( DEBU, 1) ; same locality, 10.V.1975, J. Umphrey, ( DEBU, 4) ; Haulock , 9.VII.1977, Mccreadie, ( DEBU, 1) ; Kingsville , 8.VII.1977, A.A. Konecny, ( DEBU, 1) ; Lanark , 2.VIII.1976, M.J. Sharkey, ( DEBU, 1) ; London, W. Saunders, ( DEBU, 1) ; Norval , 16.V.1980, Kevin Barber, ( DEBU, 1) ; Toronto , 10.VII.1977, W.A. Attwater, ( DEBU, 1) ; Vineland, 20.VIII.1930, W.L. Putman, ( DEBU, 1). QUEBEC: Aylmer, Queen’s Park , 24.X.1923, C.B. Hutchings, ( CNC, 1) ; Chelsea , 25.VI.1912, A. Gibson, ( CNC, 1) ; Deux-Montagnes, Parc Paul-Sauvé , 9.IV.1989, S. Laplante, ( SLC, 1) ; Dorval , 26.IX.1985, LeSage & Smetana, Ex. Pleurotus ostreatus in decid. forest, ( CNC, 2) ; Gatineau, Eardley , 11.VI.1994, F. Genier, ( CMNC, 1) ; Ile-de-Mtl , bois de Saraguay, 21.IV.1979, S. Laplante, ( SLC, 3) ; Limbour Touraine , 12.VIII.1974, R. Sexton, ( CNC, 1) ; Masham Twp. , Gatineau Co., 27. VIII.1975, D.M. Wood, teneral, ( CNC, 3) ; Meach Lk., Gatineau Park , 11.VIII.1976, J.M. Campbell, ( CNC, 1) ; Missisquoi , le Petit Pinacle, 24.IV.1979, S. Laplante, ( SLC, 1) ; Montreal , 24.VII.1970, E.J. Kiteley, ( CNC, 1) ; same locality, 1.VII.1970, E.J. Kiteley,

fungus on log, ( CNC, 1); same locality, 8.VI.1976, E.J. Kiteley, on fungus, stump, ( CNC, 4) ; same locality, 12.VI.1981, E.J. Kiteley, on fungus, stump, ( CNC, 1) ; same locality, 28.VI.1982, E.J. Kiteley, UV light trap, ( CNC, 1) ; same locality, 12.VIII.1972, E.J. Kiteley, on log fungus, ( CNC, 2) ; same locality, 1.IX.1972, E.J. Kiteley, ( CNC, 1) ; same locality, 11.VII.1982, E.J. Kiteley, UV light trap, ( CNC, 1) ; same locality, ( MCZ, 1) ; Pontiac, Eardley, 24.VIII.1991, S. Laplante, polypore on branch of old Quercus rubrus , beaten, ( SLC, 1) ; Terrebonne, 17.VIII.1918, F. T. Scott, ( LACM, 4) ; same locality, 17.VIII.1918, ( UAIC, 2) ; Vaudreuil, Rigaud, 16.VI.1990, S. Laplante, ( SLC, 2) .

Figures

Figs 1-7. Dorsal habitus of Canadian eustrophines. Fig. 1. Pseudoholostrophus impressicollis, TL = 4.3 mm; Fig. 2. Pseudoholostrophus discolor, TL = 4.8 mm; Fig. 3. Holostrophus bifasciatus, TL = 5.8 mm; Fig. 4. Eustrophus tomentosus, TL = 4.8 mm; Fig. 5. Eustrophopsis bicolor, TL = 5.6 mm; Fig. 6. Eustrophopsis confinis, TL = 5.4 mm; Fig. 7. Synstrophus repandus, TL = 6.8 mm.

Figs 8-16. Features of Canadian eustrophines. Figs. 8-14. Frontal view of head (same specimens as in Figs. 1-7). Fig. 8. Pseudoholostrophus impressicollis; Fig. 9. Pseudoholostrophus discolor; Fig. 10. Holostrophus bifasciatus; Fig. 11. Eustrophus tomentosus; Fig. 12. Eustrophopsis bicolor; Fig. 13. Eustrophopsis confinis; Fig. 14. Synstrophus repandus. Figs. 15-16. Hind tibia. Fig. 15. H. bifasciatus; Fig. 16. E. tomentosus.

Figs 17-25. Antennae of Canadian eustrophines. Fig. 17. Pseudoholostrophus impressicollis; Fig. 18. Pseudoholostrophus discolor; Fig. 19. Holostrophus bifasciatus; Fig. 20. Eustrophus tomentosus; Fig. 21. Eustrophopsis bicolor; Fig. 22. Eustrophopsis confinis; Fig. 23. Synstrophus repandus; Fig. 24. E. tomentosus, antennomeres 9-11 (sensillar field indicated by stippling); Fig. 25. S. repandus, antennomeres 9-11 (sensillar field indicated by stippling). Scale bar = 0.25 mm (Figs. 17-23); 0.1 mm (Figs. 24-25).

Fig. 31. Canadian distribution of Synstrophus repandus. Inset shows US distribution, by state. Open circle indicates state record from Hatch (1965).

Fig. 27. Canadian distribution of Holostrophus bifasciatus. Inset shows US distribution, by state.