Snails and Slugs: Phylum Mollusca, Class Gastropoda. The Class Gastropoda (in Phylum Mollusca) includes the groups pertaining to snails and slugs. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn. The shell of these creatures is often what is recovered in a fossil dig.
Causes of bleeding in the stomach can include: 1  Ulcers: Ulcers may enlarge and erode through a blood vessel, causing bleeding. 2  Gastritis. 3  Cancer. Gastric varices.  Dieulafoy 1  lesions. Portal gastropathy.
Bleeding from the stomach can be caused by: 1  Gastritis. 2  Alcohol, medications including NSAIDs (nonsteroidal anti-inflammatory drugs), aspirin, ibuprofen (Advil, Motrin), or naproxen (Aleve, Naprosyn) and many others can cause stomach ulcers or inflammation (gastritis). 3  Stomach ulcers and intestinal ulcers.