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 The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn.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.
To research the causes of Stomach bleeding, consider researching the causes of these these diseases that may be similar, or associated with Stomach bleeding: 1  Nonvariceal upper gastrointestinal hemorrhage. 2  Upper GI bleeding. 3  GI hemorrhage.  Duodenal ulcer 1  disease. Helicobacter pylori infection.  H pylori 1  infection. Duodenal ulcer hemorrhage.