Eldeceeon rolfei (Smithson 1994) ~27 cm in total length, Early Carboniferous ~335 mya, is from the same formation that yielded Silvanerpeton and Westlothiana in the Viséan. Derived from a sister to Tulerpeton, Eldeceeon was basal to Gephyrostegus watsoni and Solenodonsaurus.
Relative to G. bohemicus, the skull of Eldeceeon was shorter and taller.
The dorsal ribs are missing from the posterior half of the torso. This is an adaption to carrying larger eggs in gravid females. The pectoral girdle was more gracile.
These two specimens net together but are distinct enough to warrant distinct species names.