Reptilian
Reptilians or reptiloids were sentient, cold-blooded, reptile-like species. (; ) 

In 2153, the Xindi-Reptilians were among the first sentient reptilian species encountered by a Starfleet vessel, and were often colloquially referred to as "reptilians." () In reviewing the yet unidentified Xindi epithelial cells, Doctor Phlox identified them as scales, adding that after "constructing my physiometric profile I wouldn't be surprised to find he has reptilian characteristics." () Until learning their identity, Captain Jonathan Archer referred to the species as the "reptilian species". ()

When Captain James T. Kirk first encountered the Gorn in 2267, he observed its reptilian origin, and upon noting its large size, commented that "Like most Humans, I seem to have an instinctive revulsion to reptiles. I must fight to remember that this is an intelligent, highly advanced individual, the captain of a starship, like myself, undoubtedly a dangerously clever opponent." ()

The Selay were a reptilian species who were deadly enemies with their system cohabitants, the Anticans. ()

Tosk, the first individual from the Gamma Quadrant to enter the Alpha Quadrant through the Bajoran wormhole, was from a reptilian species known as the . () The Jem'Hadar, another species from the Gamma Quadrant, were also a reptilian species. ()

After Deanna Troi was affected by Barclay's Protomorphosis Syndrome in 2370, she began to devolve into a create possessing reptilian DNA. Her molted epidermal layer was later discovered by Data, who noted that there were no species on board the  that shed their skin in such a fashion. Jean-Luc Picard also noted that the molted skin appeared to be that on a humanoid. ()

The reptohumanoid hatchling discovered by Tom Paris and Neelix in 2372, was determined to have the future ability to stand upright, and possessed a humanoid skeletal system. Further analysis established that it was cold-blooded, had a reptilian epidermis, a brain significantly larger than most reptilian species. The two also came to the conclusion that unlike most common reptiles who simply lay their eggs and never return to protect them, this species might return because they were not dealing with a common reptile. ()

Sentient reptilian species
 Arkonian
 Beta Annari
 Caatati
 Cardassian
 Delta Theta III aborigine
 Denobulan
 Gorn
 Hirogen
 Jem'Hadar (genetically engineered)
 Kasheeta
 Reptohumanoid
 Reptoid
 Rigellian
 
 Selay
 Shivolian
 Sord's species
 Telsian
  (genetically engineered)
 Tygarian
 U'tani
 Vaadwaur
 Voth
 Xindi-Reptilian

See also

External link 
 
Lifeform classifications