Distribution of Strobilops aeneus Pilsbry, 1926, in Canada, with two new Ontario records (Mollusca: Gastropoda: Strobilopsidae)

Abstract

The geographic distribution of Strobilops aeneus Pilsbry, 1926, a rare species in Canada, is reviewed and all known records are mapped. Two recent records, the only ones since 1941, are reported from the province of Ontario. One of these records represents a small range extension ca. 85 km north of the closest previous site. Specimens identified as S. aeneus from Ontario, New Brunswick, and Nova Scotia were re-examined and found to be another species.

Guppya sterkii (Dall, 1888) (Gastropoda, Eupulmonata, Euconulidae) in eastern Ontario, Canada

“…The forest there is Carolinian, composed of species of hardwoods, some of which just barely enter Canada in southern Ontario. This part of the province is within the Mixedwood Plains Ecozone, a region of important terrestrial mollusc diversity in Canada (Forsyth and Oldham 2014), but one that is heavily impacted by human activities since colonization.…”

“…observ.). Despite previous interest in terrestrial molluscs in eastern Ontario, it is still possible to find previously unrecorded species in the region (e.g., Forsyth and Oldham 2014) within the remnants of old-growth hardwood forests in this region.…”

Terrestrial molluscs from the Ontario Far North

“…Specimens reported on here were collected in the Kenora and Cochrane districts, northern Ontario, Canada, in 2009and 2012to 2014 Specimens were collected opportunistically and incidentally to other fieldwork being conducted. Many specimens collected were hand-picked from beneath debris, particularly under logs on beach ridges near the James and Hudson Bay coasts and logs on the upper margins of the floodplains of major rivers.…”

“…Species identifications were made by RGF using several publications (e.g., Pilsbry 1946Pilsbry , 1948Gerber 1996;Nekola and Barthel 2002;Nekola and Coles 2010;Forsyth and Oldham 2014;Nekola et al 2015) that are listed for each species below. Suprageneric classification follows Bouchet et al (2005) except that, based on recent findings of Nekola and Coles (2016), Gastrocoptidae (for Gastrocopta) is treated as a separate family rather than a subfamily of Vertiginidae, as previously done by some authors (e.g., Schileyko 1998) and Columella is placed as belonging to Chondrinidae.…”

“…Strobilops labyrinthicus (Say, 1817) Identification -Three species of Strobilops occur in Ontario (Oughton 1948;Pilsbry 1948;Forsyth and Oldham 2014). The majority of Far North specimens are weathered and no longer translucent, so we could not see the lamellae within the last whorls of these shells (a useful character for species' determination; see especially Forsyth and Oldham 2014), but based on its size and shape, these are S. labyrinthicus.…”