Most hearts

Last updated: October 12, 2017 at 3:36 am

Hagfish (Myxini spp.) have four hearts composed of a three-chambered systematic heart assisted by three accessory pumps.

Cephalopods (octopus and squid) have three hearts composed of a systematic heart and two gill hearts sending blood to and from the gills.

SOURCE:
Verified by Diving Almanac & Book of Records official

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