How barriers to gene flow arise and are maintained are key questions in evolutionary
biology. Speciation research has mainly focused on barriers that occur either before mating …

ABSTRACT The family Physidae (Pulmonata: Basommatophora) is a group of freshwater
hermaphroditic snails that have a Holarctic distribution with extension into Central and South …

This chapter is an introduction to the Phylum Mollusca and a review of freshwater gastropod
systematics, evolution, regional distribution and diversity, reproduction and life history …

ABSTRACT Physa acuta (Gastropoda: Heterobranchia: Physidae) is a freshwater snail
commonly found in North American rivers, streams and ponds. Despite its widespread …

The sewage snail Physa acuta, native to North America, is an effective invasive species
around the world. In Chile, it was first reported in 2014 in the north central area of the …

Recent experimental studies of reproductive isolation have distinguished three physid
species in South Carolina: the cosmopolitan Physa acuta, bearing a one-part penial sheath …

ABSTRACT A common issue for several freshwater snail families is the fact that, for some
genera, the criteria for species delimitation are scarce, subjected to intraspecific and …

Freshwater snail Physa acuta has been considered as an important invasive species and
medical mollusc. Field investigation has shown that this snail could survive better than other …

The phylogenetic relationships of four nominal south-central Canadian freshwater physids
(Physa (sensu lato) skinneri Taylor, 1954, Physa integra (Haldeman, 1841), Physa gyrina …

The weak and variable nature of the shell morphometric criteria by which the North
American ancylid limpets Ferrissia rivularis and Ferrissia fragilis are distinguished has led to …