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 The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn.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.
It is important you find a cause of trapped gas, which may be: 1  Certain food irritating your bowel: Foods to avoid in IBS. Food poisoning. 2  Abdominal adhesions created after abdominal surgery, pelvic inflammatory disease (PID), endometriosis or trauma. 3  Intestinal obstruction. 4  Other causes of upper abdominal bloating.