Stephanostomum baccatum

Stephanostomum baccatum is a species of parasitic flatworms in the family Acanthocolpidae.

Stephanostomum baccatum is a marine hermaphroditic endoparasite that feeds on its host. Larval stages have been found in the digestive gland of Buccinum undatum.

Distribution
The distribution of S. baccatum includes:
 * Southern Gaspé waters (Baie des Chaleurs, Gaspe Bay to American, Orphan and Bradelle banks; eastern boundary: Eastern Bradelle Valley)
 * 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)
 * Laurentian Channel (bathyal zone)(Esquiman Channel),
 * The lower Laurentian Channel (bathyal zone as far as Cabot Strait; Cape North, N.S., St. Paul Island to Cape Ray, NL).