Haplotrema concavum Say,1821
Shell depressed,yellowish or whitish,glossy and smooth.
Aperture oval and umbilicus wide and open.
Height 5.3-9.5 mm and width 11-21 mm with 4.5-5.5 whorls.
In Canada,MA,MI,MO,AR,MS,FL.
photo:© 1998 American Microscopical Society, Inc.
Haplotrema vancouverense Lea,1839
Shell solid,depressed,olive-ocher with darker and lighter streaks,spire convex.
Height 8-13 mm and width 20.5-32 mm with 5.25-5.5 whorls.
In moist and wooded areas.
In Alaska,BC,WA,OR,ID,CA
© 2000 William Leonard
Haplotrema minimum(Ancey) Shell depressed with a low spire,thin,surface glossy. Height 7-9 mm and width 14-21.8 mm with 5 whorls. In California.
Ancotrema hybridum Ancey,1888
© 2005 Kristiina Ovaska
Ancotrema sportella Gould,1846
Shell depressed,spire very low,color yellowish green,with sharp coarse growth lines.
Aperture almost circular.
Height 7-9.7 mm and width 11.2-21.4 mm with 5.25-6.3 whorls.
In British Columbia,Washington and Oregon.
© 1999 William Leonard