THE HYDROBIID SNAIL GENUS MARSTONIA


 FRED G. THOMPSON'


SYNOPSIS: The recent species of Marstonia are revised, based on material in most major mu-
seum collections and on new material recently collected in the southeastern states. A total of
eight species are recognized, of which five are described as new: M. arga, M. ogmnorhapha, and
M. pachyta from the Tennessee River system; M. castor from the Flint River system, Georgia;
and M. halcyon from the Ogeechee River system, Georgia. Five names are placed in the syn-
onymy of Marstonia lustrica (Pilsbry): Amnicola oneida Pilsbry, A. winkleyi Pilsbry, A. perlus-
trica Baker, M. decepta Baker, and M. gelida Baker. M. olivacea is considered a distinct species
of uncertain status and is probably extinct. Marstonia is placed in the subfamily Nymphophilinae
and is most closely related to Cincinnatia. Other North American genera in Nymphophilinae
include Fonticella, Notogillia, Spilochlamys, Rhapinema, Nymphophila, and Birgella.














' The author is Associate Curator in Malacology at the Florida State Museum and Associate Professor in the Department of
Zoology, University of Florida, Gainesville 3261T. Manuscript accepted 3 August 1975.


Thompson, Fred G. 1977. The Hydrobiid Snail Genus Marstonia. Bull. Florida State Mus., Biol.
Sci., Vol. 21, No. 3, pp. 113-158.