Urocordylidae

Urocordylus (from Greek: οὐρά oura, 'tail' and Greek: κορδῡ́λη kordū́lē, 'club') is an extinct genus of nectridean tetrapodomorphs. It is the type genus of the family Urocordylidae. Fossils have been found from Ireland that date back to the Westphalian stage of the late Carboniferous. It had total length of about , but the skull was only about long.

Sauropleura (meaning "lizard side") is an extinct genus of nectridean tetrapodomorphs within the family Urocordylidae. Fossils are known from the United States (Texas, Ohio) and Europe (Czech Republic). The following species are included: Sauropleura bairdi Sauropleura longicaudata Sauropleura pectinata Sauropleura scalaris

Crossotelos is an extinct genus of nectridean tetrapodomorphs within the family Urocordylidae. It contains a single species, Crossotelos annulatus.

The Urocordylidae are an extinct family of nectridean lepospondyl amphibians. Urocordylids lived during the Late Carboniferous and Early Permian in what is now Europe and North America and are characterized by their very long, paddle-like tails. In life, they were probably newt-like and aquatic.

Ptyonius is an extinct genus of nectridean tetrapodomorphs within the family Urocordylidae.