herpetology is an odd scientific discipline. reptiles and amphibians are not each other's closest relatives, although they do have a fair number of biological similarities. but it's like creating a new discipline for bats and birds simply because most of them fly. funny really. I think amphibians have about as much in common with fish, especially when it comes to husbandry, particularly water quality and filtration. there is a group of scientists called the American Society of Ichthyologists and Herpetologists (ASIH) that share an interest in all these beasts.