Largest organisms photosynthetic unicellular and multicellular protists that are related to land plants. The thallus of the unicellular mermaid's wineglass, "Acetabularia", can grow to several inches (perhaps 0.1 to 0.2 m) in length. The fronds of the similarly unicellular, and invasive "Caulerpa taxifolia" can grow up to a foot (0.3 m) long. A member of the order Cetacea, the blue whale ("Balaenoptera musculus"), is thought to be the largest animal ever to have lived. The maximum recorded weight was 190 metric tonnes for a specimen measuring , whereas longer ones, up to , have been recorded but not weighed. The African bush
Largest prehistoric animals largest-known frog ever was a yet unnamed species frog that was about . The largest-known diacectid, "Diadectes", was a heavily built animal, long, with thick vertebrae and ribs. The largest-known anthracosaur was "Anthracosaurus", a predator. It could reach up to in length. "Eogyrinus" commonly reached ; however, it was more lightly built. The largest-known temnospondyl amphibian is "Prionosuchus", which grew to lengths of . The largest-known of these was the long "Rhizodus". The largest-known bony fish of all time was the pachycormid, "Leedsichthys problematicus", at around long. Claims of larger individuals persist. The largest-known of ichthyodectiform fish was "Xiphactinus", which