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Females are about 9.5–19 millimeters (0.37–0.75 in) long, while males are somewhat smaller. The upper surface of the abdomen is brown and hairy. The legs display alternating light and dark brown bands. The undersurface of the abdomen is black, with two white spots.
The specific name bimaculata refers to the two dark spots on either side of the adhesive sucker while the generic name is a compound of di meaning "two", pleco meaning "fold" and gaster meaning belly, a reference to the double-type sucker of this genus. [10]
Peutz–Jeghers syndrome can cause dark spots on the oral mucosa or on the lips or the skin around the mouth. Several GI diseases, especially those associated with malabsorption , can cause recurrent mouth ulcers , atrophic glossitis , and angular cheilitis (e.g., Crohn's disease is sometimes termed orofacial granulomatosis when it involves the ...
Melena is a form of blood in stool which refers to the dark black, tarry feces that are commonly associated with upper gastrointestinal bleeding. [1] The black color and characteristic strong odor are caused by hemoglobin in the blood being altered by digestive enzymes and intestinal bacteria. [2]
Digested blood from the upper gastrointestinal tract may appear black rather than red, resulting in "coffee ground" vomit or melena. [2] Other signs and symptoms include feeling tired, dizziness, and pale skin color. [18] A number of foods and medications can turn the stool either red or black in the absence of bleeding. [2]
[1] [2] The condition is associated with dilated small blood vessels in the gastric antrum, which is a distal part of the stomach. [1] The dilated vessels result in intestinal bleeding. [3] It is also called watermelon stomach because streaky long red areas that are present in the stomach may resemble the markings on watermelon. [1] [2] [3] [4]
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The tarry black colour is produced by the coagulative necrosis of mucosa resulting in intramucosal haemorrhage and acid hematin deposition. This condition was first described in a patient with acid poisoning. [1] A similar condition has been described in acute esophageal necrosis due to mucosal ischemia resulting from hemodynamic compromise. [2]