Matthew
I would vote for the second option.
Once mis-classified as Atelopus stelzneri,the toads are re-classified as being a genus: Melanophryniscus. There seem to be at least some 14 species aggregated into 4 specie-groups: stelzneri group, rubiventris group, moreirae group and the tumifrons group.(Acta Zoologica 84: 145-154 (2003)).
Stelzneri has yellow dorsal blotches and dots, yellow bandages on the upper front-legs and bigger yellow blotches on the shoulders.
The ventral region shows a black netting on a red or orange background; throat is deepblack, finger-and toe-tips are red. Genderdetermination by size:
females up to 30 mm, males up to 20-25 mm.
Other species differ in ventral coloration.
All are found in pampa-like arid and rocky habitats: cool and rather dry environments up to 1600 m. Stelzneri has even been found during occasional early morning snowfall in Northern Argentina. A hardy one, ain't it.
I find stelzneri easy to keep/ breed when given the environment they need. Raising the tiny toadlets is another story.
Han.