This is not a duplicate because I'm specifically asking about the Uragas.
"Uragas" are mentioned as a supernatural race in the Manusmriti alongside other celestial/supernatural races like the Daityas, Rakshasas, Kinnaras, etc:
3.196 - The Barhisads, the sons of Atri, are declared to be the Pitṛs of Daityas, Dānavas, Yakṣas, Gandharvas, Uragas, Rākṣasas, Suparṇas and Kinnaras.
Medhatithi does not even comment on what Uragas are.
All the other species are well known.
https://www.swaminarayan.faith/media/3853/vishnu-sahashtra-namavali-stotra-plus-meaninigs.pdf
The phalastuti of the VishnuSahasranama says
Sasurasura gandharwa, sayakshoraga rahshasam, Jagaddese vartatedam krishnasya sacharacharam
All this world,Which moves and moves not,And which has devas, rakshasas and Gandharwas, And also asuras and nagas,Is with Lord Krishna without fail.
Uraga (literally, one who travels on his chest) is simply translated as Naga. It is just a synonym of Naga.
The study of the Bharata is an act of piety. He that readeth even one foot, with belief, hath his sins entirely purged away. Herein Devas, Devarshis, and immaculate Brahmarshis of good deeds, have been spoken of; and likewise Yakshas and great Uragas (Nagas). Herein also hath been described the eternal Vasudeva possessing the six attributes. He is the true and just, the pure and holy, the eternal Brahma, the supreme soul, the true constant light, whose divine deeds wise and learned recount; from whom hath proceeded the non-existent and existent-non-existent universe with principles of generation and progression, and birth, death and re-birth. That also hath been treated of which is called Adhyatma (the superintending spirit of nature) that partaketh of the attributes of the five elements. That also hath been described who is purusha being above such epithets as 'undisplayed' and the like; also that which the foremost yatis exempt from the common destiny and endued with the power of meditation and Tapas behold dwelling in their hearts as a reflected image in the mirror.
