Firmisternal denotes a morphology of the pectoral girdle of

frog A frog is any member of a diverse and largely Carnivore, carnivorous group of short-bodied, tailless amphibians composing the order (biology), order Anura (ανοὐρά, literally ''without tail'' in Ancient Greek). The oldest fossil "proto-f ...

s. In firmisternal girdles, the epicoracoid cartilages are fused anteriorly and posteriorly, and usually have an omosternum present. This is in contrast to the other predominant morphology, an arciferal girdle. Firmisternal morphology is generally considered a unique trait of the broad clade "Ranoidea", including Ranidae,

Rhacophoridae The Rhacophoridae are a family of frogs that occur in tropical sub-Saharan Africa, South India and Sri Lanka, Japan, northeastern India to eastern China and Taiwan, south through the Philippines and Greater Sundas, and Sulawesi. They are commonly ...

and other families.

References

Animal morphology Frogs {{anura-stub