These frogs are closely related to such genera as Huia, Meristogenys, Odorrana, Pelophylax and Rana, but still form a distinct lineage among the core radiation of true frogs.

In another incidence of convergent evolution yielding adaptation to habitat, the tadpoles of Amolops, Huia, Meristogenys as well as Rana sauteri have a raised and usually well-developed sucker on their belly.

[3] The delimitation of this genus has proven complicated, with many species believed to belong elsewhere.

Due to the degree of convergent evolution, DNA sequence studies are very helpful in assigning species to the genera, though the possibility of past hybridization cannot be discounted in Ranidae.

At least one undescribed species is known to exist, a very distinct form from Phetchaburi in Thailand that is possibly closer to A. marmoratus than to most others.