Hemithiris psittacea (Gmelin 1791)

Gulf of St. Lawrence (unspecified region), Saguenay Fjord, northern Gaspe waters, southern Gaspe waters (Baie des Chaleurs, Gaspe Bay to American, Orphan and Bradelle banks; eastern boundary: eastern Bradelle Valley), downstream part of middle St. Lawrence estuary, Magdalen Islands (from the eastern Bradelle valley to the west, as far as Cape North, including the Cape Breton Channel), lower St. Lawrence estuary, Prince Edward Island (from the northern tip of Miscou Island, N.B. to Cape Breton Island south of Cheticamp, including the Northumberland Strait and Georges Bay to the Canso Strait causeway), lower North Shore, middle North Shore (from Sept- Isles to Cape Whittle, including the Mingan Islands), North and South Slope of Anticosti Island; western slope of Newfoundland, including the southern part of the Strait of Belle Isle but excluding the upper 50m in the area southwest of Newfoundland

infralittoral and circalittoral of the Gulf and estuary

Species occurs from the Miocene (fossil specimens) up to the present.