The spiral valve alternately blocks & unblocks the entrances to the left and right pulmonary arches (sending unoxygenated blood to the skin & lungs). [ ]

This is just here as a test because I lose it

Term information



taxon notes

found in dipnoans and amphibians

The spiral valve is considered to have evolved from the right member of the four embryonic endocardial ridges (Goodrich, 1930 - via Morris 1974)

Term relations