Triangle Floater (Alasmidonta undulata)

Description	-Shell: 75 mm long, 45 mm high and 35 mm wide -Periostracum*: yellowish, greenish, reddish brown or black, and with greenish or blackish rays that are obscured in old blackened specimens -Nacre**: whitish anteriorly and bluish posteriorly, or modified with salmon or pink
Distribution	-Atlantic drainage from Nova Scotia and the St. Lawrence River and its tributary rivers south to Florida -Designated "of special concern" in the U.S.A.
Ecology	-Occurs in rivers and lakes -Found especially on sand or gravel bottoms

Source: Clark Arthur H. 1981. The Freshwater Molluscs of Canada. National Museum of Natural Sciences/ National Museums of Canada

*Periostracum: the outer parchment-like layer of a mollusc shell
**Nacre: the pearly inner layer characteristic of some mollusc shells

Triangle Floater in the Petitcodiac River Watershed

• Not common
• Rare throughout the tributaries