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More than 5,000 species are described in the order. The living anurans are typically divided into three suborders: Archaeobatrachia, Mesobatrachia, and Neobatrachia. This classification is based on such morphological features as the number of vertebrae, the structure of the pectoral girdle, and the morphology of tadpoles.
A few species deposit eggs on land or bypass the tadpole stage. Adult frogs generally have a carnivorous diet consisting of small invertebrates, but omnivorous species exist and a few feed on plant matter. Frog skin has a rich microbiome which is important to their health. Frogs are extremely efficient at converting what they eat into body mass.
Anurans all share a number of morphological characteristics, so researchers have had to use DNA testing to understand their relationships. ML and Bayesian analyses using a nuclear marker toolkit have resolved some of the relations of the anurans in Hyloidea. 53 out of the 55 previously established nodes on the phylogenetic tree were supported by this DNA testing. [2]
It is also by far the largest of the three; its more than 5,000 different species make up over 96% of all living anurans. The differentiation between Archaeobatrachia , Mesobatrachia , and Neobatrachia is based primarily on anatomic differences, especially the skeletal structure, as well as several visible characteristics and behaviors.
Many aquatic salamanders and some caecilians possess electroreceptors called ampullary organs (completely absent in anurans), that allow them to locate objects around them when submerged in water. [74] The ears are well developed in frogs. There is no external ear, but the large circular eardrum lies
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However, acknowledging the significant differences in size and that small genetic differences do exist, [8] they are still retained as subspecies: [3] [5] [8] Nimbaphrynoides occidentalis occidentalis (Angel, 1943) — Western Nimba toad, Mount Nimba viviparous toad