Freshwater Gastropods of North America

Editor's Note. Word has reached us of the death of Dr. George A. Te, who passed away late last year in New Hamburg, NY, at the age of 6...

Editor’s Note – This essay was subsequently published as: Dillon, R.T., Jr. (2019c) What subspecies are not.  Pp 83 - 91 in The Freshwater G...

Editor’s Note – This essay was subsequently published as: Dillon, R.T., Jr. (2019c) What is a subspecies?  Pp 77 - 82 in The Freshwater Gas...

We should begin this essay by reminding our readership of the very precise (and perhaps rather peculiar) definition of the adjective “rare”...

Editor's Note - While the text of the post below remains relevant, in November 2015 the FWGNA database was expanded to include 6.5% ad...

Editor’s Note – This essay was subsequently published as: Dillon, R.T., Jr. (2019d)  Potamopyrgus in US Atlantic drainages.  Pp 41 - 45 in T...

We are pleased to announce that a new web-based resource, the Freshwater Gastropods of Mid-Atlantic States by R. T. Dillon, M. A. Ashton,...