[3] Franz Werner described Atelopus subornatus based on three specimens (syntypes), for which the total body length was 30 mm (1.2 in).

The egg masses are string-like, with individual embryos measuring 2–3 mm (0.079–0.118 in) and enclosed in a jelly capsule.

The egg strings are not adherent but sink to the stream bottom and get caught by obstructions.

[5] Atelopus subornatus inhabits both pristine and disturbed cloud forests[1][4] as well as sub-páramos at elevations of 2,000–3,020 m (6,560–9,910 ft) above sea level.

It is threatened by chytridiomycosis as well as habitat loss caused by agricultural expansion and water pollution from pig farms.