Subspecies

Four types of Silurian identified by the Twelfth Doctor. (PROSE: A History of Humankind)

Subspecies were a result of evolution. New subspecies, as well as new species, meant that Light's undertaking of cataloguing life became an endless task. (TV: Ghost Light)

Humans

The Tenth Doctor described the new humans as "a whole new subspecies". (TV: New Earth)

Cybermen

Different versions of Cybermen. (TV: The Doctor Falls ^[+]Loading...["The Doctor Falls (TV story)"])

Main article: Cyber-subspecies

In the CyberHive, ArcHivist Hegelia identified several subspecies of Cybermen descended from the Mondasians, which she termed "Cyber-subspecies". (AUDIO: Origins of the Cybermen, The Early Cybermen, The Cyber Nomads, The Ultimate Cybermen)

Silurians

Historians identified a number of Silurian subspecies, the early Silurians, the middle Silurians, the late Silurians, and the Sea Devils. (PROSE: The Monster Vault) Horlak's tribe carried Raldoma Syndrome which, while harmless to their own subspecies, was deadly to the other 99% of Silurians, including Vastra's tribe. (COMIC: The Lost Dimension)