A. Ricciardi et Hm. Reiswig, FRESH-WATER SPONGES (PORIFERA, SPONGILLIDAE) OF EASTERN CANADA - TAXONOMY, DISTRIBUTION, AND ECOLOGY, Canadian journal of zoology, 71(4), 1993, pp. 665-682
During a recent survey of the freshwater sponges of eastern Canada (fr
om Ontario to Newfoundland), 15 species were recorded, representing ap
proximately 50% of the total number of species known from North Americ
a. Radiospongilla crateriformis, Spongilla aspinosa, and Trochospongil
la horrida are reported from Canada for the first time. Two problemati
c species, Corvospongilla novaeterrae and Spongilla johanseni, are rev
iewed and their status is revised. Detailed notes on taxonomy, morphol
ogy, distribution, and ecology are given. New limits of tolerance with
respect to pH, water temperature, and calcium and magnesium concentra
tions are established for several species. A taxonomic key to the fres
hwater sponges of eastern Canada is presented.