Equidae
Equidae (sometimes known as the horse family) is the taxonomic family of horses and related animals, including the extant horses, donkeys, and zebras, and many other species known only from fossils. All extant species are in the genus "Equus". Equidae belongs to the order Perissodactyla, which includes the extant tapirs and rhinoceros, and several extinct families.
Egernia
It is the namesake genus of the "Egernia" genus-group, which also includes the Solomon Islands skink ("Corucia"), "Cyclodomorphus" and the blue-tongued skinks ("Tiliqua"). In some older works, it is considered closely related to "Mabuya", but even among the subfamily Lygosominae this genus does not seem to be particularly closely related and would—were the genus-groups treated at the rarely used rank of infrafamily—certainly constitute an infrafamily of its own. On the other hand, the enigmatic crocodile skinks ("Tribolonotus") might be a very basal member of the "Egernia" genus-group.