( Fig. 8–15)
Hydrosmecta newfoundlandica Klimaszewski and Langor, in Klimaszewski et al. 2011. Webster et al. 2012, Klimaszewski et al. (in press).
Diagnosis. Body subparallel, flattened ( Fig. 8), length 2.8–3.4 mm; colour dark brown with antennae, legs and elytra paler, reddish- or yellowish-brown ( Fig. 8); integument moderately glossy, forebody with fine, moderately dense punctation and faint meshed microsculpture; head slightly narrower than pronotum, eyes large but not protruding ( Fig. 8); antennae moderately robust, all antennomeres slightly to distinctly elongate ( Fig. 8); pronotum widest at apical third ( 0.52 mm) ( Fig. 8); elytra flattened, dis- tinctly elongate, at suture about as long as pronotum, broader than pronotum ( 0.61 mm at shoulders) ( Fig. 8); abdomen subparallel, slightly widening apicad. Male. Apical margin of tergite VIII sinuate with two small lateral denticles, and variable number of minute denticles near middle ( Fig. 11); sternite VIII deeply emarginate basally and parabolically rounded from base to apex ( Fig. 12); median lobe of aedeagus in lateral view with tubus wide, ventral margin straight, apex abruptly bent ventrad ( Fig. 9); in dorsal view bulbus large, ovoid, tubus broad, moderately long, triangular apically ( Fig.10). Female. Apical margin of tergite VIII with broad, shallow emargination medially ( Fig. 13); sternite VIII broadly rounded apically ( Fig. 14); spermatheca short, capsule broad, tubular and elbowed, apical invagination wide and deep, stem highly sinuate ( Fig. 15).
Distribution. Origin: Nearctic. CANADA: NF, NB. USA: TN.
New record from Tennessee: USA, Tennessee, Fentress Co., Fallen Entrance Cave, 4 mi SSW Jamestown, 26.IX.03, J. Lewis ( LFC) 1 female.
Habitat and collection data. Habitat. NB specimens were collected from among cobblestones along clear, rocky, river margins near the outflow of brooks. One individual was collected from the margin of a spring-fed brook among gravel on firm sand/clay/gravel mix near the outflow of the brook into a clear, rocky river. Others were collected on a partially shaded cobblestone island in a clear, fast flowing river. Specimens were usually found among cobblestones and gravel at water’s edge. Klimaszewski et al. (2011) did not specify the habitat of NF specimens. Collecting period. V-VIII. Collecting method. Hand collecting from among cobblestones near water.
Comments. Externally, A. newfoundlandica somewhat superficially agrees with some characteristics of the genus Hydrosmecta, within which it was originally classified ( Klimaszewski et al. 2011), but it has the median lobe of the aedeagus and the spermatheca of the Atheta type.