Basal tetrapods of Europe

Crassigyrinus (from , 'thick' and , 'tadpole') is an extinct genus of carnivorous stem tetrapod from the Early Carboniferous Clackmannan Group of Scotland and possibly Greer, West Virginia.

Karpinskiosaurus is an extinct genus of seymouriamorphs. It includes two species: Karpinskiosaurus secundus and Karpinskiosaurus ultimus. Karpinskiosaurus secundus is represented by two specimens with skull lengths of about 75 mm. All specimens of K. ultimus are smaller than those of K. secundus. Total length of the reptiliomorph was about 50–75 cm.

Eucritta (meaning "true creature") is an extinct genus of stem-tetrapod from the Viséan epoch in the Carboniferous period of Scotland. The name of the type and only species, E. melanolimnetes ("true creature from the black lagoon") is a homage to the 1954 horror film Creature from the Black Lagoon.

Pteroplax is an extinct genus of embolomerous anthracosaur. Only one species (P. cornutus Hancock & Atthey, 1868) has been described; the skull table noted is the lectotype of this species. Pteroplax dates from the late Carboniferous Period, about 315 million years ago. It is known with certainty only from Newsham in Blyth, Northumberland, England. At that site, it shared a coal-swamp lake habitat with the larger embolomere, "Eogyrinus" (whose name is a junior synonym of Pholiderpeton Huxley, 1869). Pteroplax probably grew up to about in length and was largely aquatic, feeding upon fish and sm

Eldeceeon is an extinct genus of reptiliomorph from the Mississippian (early Carboniferous) of Scotland. It is known from two fossil specimens found within the Viséan-age East Kirkton Quarry in West Lothian. The type and only species, E. rolfei, was named in 1994. Eldeceeon is thought to be closely related to embolomeres, but it has several distinguishing features including long limbs and a short trunk. Initially known from two crushed partial skeletons, additional specimens have been reported by Ruta & Clack (2006). Eldeceeon was redescribed by Ruta, Clack, & Smithson (2020). The redescriptio