Why the midwife toad is a masterclass in evolutionary survival and ancient lineage

Nature · Published 3 October 2026 Swipe more like this →

In short: Known as painted frogs or midwife toads, the Alytidae family represents a primitive lineage of amphibians. While once widespread, these creatures now inhabit specific pockets of Europe and northwest Africa. Their history is marked by taxonomic debates, mysterious disappearances, and a surprising rediscovery that challenged our understanding of extinction.

The Alytidae family, historically referred to as Discoglossidae, consists of three distinct extant genera: Alytes, Discoglossus, and Latonia. These frogs are categorized as primitive, possessing ancestral traits that have persisted through time. The taxonomy remains a subject of academic discussion, as some researchers argue that the differences between Alytes and Discoglossus are significant enough to warrant splitting them into separate families, potentially reviving the Discoglossidae classification. This complexity is further compounded by the historical use of the term discoglossid to describe various fossil frogs that share superficial similarities but lack a close evolutionary relationship.

The physical characteristics and habitats of these genera vary significantly. The Alytes genus exhibits toad-like features and is primarily terrestrial, whereas the Discoglossus genus is smoother, more frog-like, and prefers aquatic environments. A notable member of the Latonia genus, the Hula painted frog, provides a compelling case study in biological resilience. Long presumed extinct, the species was eventually rediscovered in Israel, proving that even groups thought to have vanished can persist in isolated pockets. All species within the family share a common reproductive trait: they produce pond-dwelling tadpoles.

The classification of these amphibians has evolved over time as genetic research has refined our understanding of their lineage. For instance, the genera Bombina and Barbourula were previously grouped within the Alytidae family but have since been reclassified into the Bombinatoridae. This shift highlights the ongoing effort to map the phylogenetic relationships of living amphibians. Studies utilizing complete mitochondrial genomes and nuclear genes have been instrumental in clarifying these connections, revealing that the initial diversification of these groups occurred long ago, predating the breakup of the supercontinent Pangaea. This deep history underscores the importance of the Alytidae as a living link to the ancient past of vertebrate evolution.

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