Heart in Anguilla (freshwater eel) is
3 chambered with an incompletely divided ventricle
2 chambered with one auricle and one ventricle
3 chambered with one auricle and two ventricles
4 chambered with two auricles and two ventricles
2 chambered with one auricle and one ventricle. The heart of a freshwater eel, specifically Anguilla, has two chambers: one auricle and one ventricle. This is different from the four-chambered heart found in mammals, including humans. Hence, the correct answer is option 2.