Streptococcus anginosus. Classification, nomenclature. and identification of the. Streptococcus anginosus group. (SAG) have been historically. problematic and unreliable, mainly due to variability in. bacteriological characteristics. and clinical presentations.
Discord is one of the species called a draconequus (as explained by Cheerilee from the beginning of the episode). Discord is a combination of many body parts from different creatures which also makes him a chimera.
1 Discord is also friends with Gloomius Maximus, before he (Discord) truly reformed.  Discord will become the FT Squad's enemy in The FT Squad's Adventures in My Little Pony: Friendship is Magic, but will later become an ally after getting reformed by Fluttershy.