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The largest living amphibian is the 1.8 m (5 ft 11 in) Chinese giant salamander (Andrias davidianus), but this is dwarfed by the extinct 9 m (30 ft) Prionosuchus from the middle Permian of Brazil. The study of amphibians is called batrachology, while the study of both reptiles and amphibians is called herpetology.
Ranging from three cm to one m long, the largest sea cucumbers may have a diameter of 24 cm. Holothurians generally look long and worm-like, but retain the pentaradial symmetry characteristic of the Echinodermata.