SCP-2339 is the collective designation for an anomalously large Bombus terrestris (buff-tailed bumblebee) nest and the bees residing within
I first misread this as saying the bees themselves were anomalously large. It might be less clunky to write something like:
SCP-2339 is an anomalously large nest of bees, of genus Bombus terrestris (buff-tailed bumblebee)
I suggest inserting a comma for readability: 85,000
usually of the classical genre.
"The" classical genre? You could say "of classical genres", or "western orchestral music written 16th-19th century", or something that suggests the Foundation documenter knows about the topic.
Flight of the Bumblebee
Do they prefer to play in the key of B?