Tachyporus transversalis Gravenhorst, 1806**

Webster, Reginald P., Sweeney, Jon D. & DeMerchant, Ian, 2012, New Staphylinidae (Coleoptera) records with new collection data from New Brunswick and eastern Canada: Tachyporinae, ZooKeys 186, pp. 55-82 : 66-67

Tachyporus transversalis Gravenhorst, 1806** Map 16

Material examined.

New Brunswick, Carleton Co., Two Mile Brook Fen, 46.3619°N, 67.6733°W, 6.V.2005, R. P. Webster, eastern white cedar swamp, in litter at base of cedar (1, NBM); near Hovey Hill P.N.A., 46.1152°N, 67.7632°W, 10.V.2005, R. P. Webster, mixed forest with cedar, vernal pond margin, in moist leaves on muddy soil (4, RWC). Charlotte Co., Rt. 3 at Deadwater Brook, 45.4744°N, 67.1225°W, 3.VI.2005, R. P. Webster, black spruce forest (forested bog) in moist sphagnum (1, RWC). Saint John Co., Musquash, 45.1856°N, 66.3402°W, 30.V.2006, R. P. Webster, freshwater marsh, in litter on hummock (1, RWC). York Co., Charters Settlement, 45.8267°N, 66.7343°W, 16.IX.2005, 29.III.2006, R. P. Webster, sedge fen, in litter and moss at base of tree (2, NBM, RWC); Mazerolle Settlement, 45.8788°N, 66.8311°W, 9.IV.2006, R. P. Webster, margin of stream in litter at base of cedar (1, RWC); 9 km W of Tracy off Rt. 645, 45.6888°N, 66.8004°W, 22.V.2008, R. P. Webster, sedge marsh, in Carex hummock (3, NBM, RWC); New Maryland, U.N.B. Woodlot, 45.9116°N, 66.6698°W, 26.V.2008, R. Webster, G. Forbes, & M.-A. Giguère, abandoned beaver lodge occupied by muskrats, in debris in roof of lodge (1, RWC).

Collection and habitat data.

This is a hygrophilous species in both Europe and North America and is usually found in marshes and bogs in moss (especially sphagnum) and debris ( Campbell 1991). In New Brunswick, this species was found in various wetland habitats, including a forested black spruce ( Picea mariana (Mill.) B.S.P.) bog, an eastern white cedar swamp, sedge ( Carex ) fens and marshes, freshwater marshes, stream margins, the margin of a vernal pond, and in an abandoned North American beaver Castor canadensis Kuhl) lodge occupied by muskrats ( Ondatra zibethicus L.). Adults occurred in moist leaves, sphagnum, litter, and moss, in Carex hummocks, and in debris in the roof of a beaver lodge. In New Brunswick, this species was collected during March, April, May, and June.

Distribution in Canada and Alaska.

ON, QC, NB ( Campbell 1991). Campbell (1991) considered the distribution and habitat of this species in the Nearctic region unusual for a Holarctic species because of the specialized habitat preferences (found in sphagnum and debris in marshes and bogs) and pattern of distribution (restricted to Ottawa Valley of Ontario and Quebec). He suggested that the species may have been overlooked by most collectors and may actually have a broader distribution in North America than the records indicate. Klimaszewski et al. (2010) considered Tachyporus transversalis Gravenhorst as an adventive Palaearctic species.