Lymph heart
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A lymph heart is an organ which pumps lymph in lungfishes, amphibians, reptiles, and flightless birds back into the circulatory system.[1][2] In some amphibian species, lymph hearts are in pairs, and may number as many as 200 in one animal the size of a worm, while newts and salamanders have as many as 16 to 23 pairs of lymph hearts.[2][3]
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Lymph hearts are thought to have evolved in Rhipidistia. Mammals have lost the lymph heart as a centralized organ, instead having the lymph vessel themselves contract to pump lymph.[2]