system
Given the following post, respond as if you're commenting on Reddit:
human
What is the Largest Clade with One Extant Member?

 The family Ailuridae has one extant member, the red panda, is there any  larger clade (like an order or something) that also only has one extant member?
gpt
This is inevitably going to be a bit imprecise because of debates about whether or not you have a single species or several and what "level" a clade is at...but

Aardvarks are the only species in their order

Until recently there was only one described species in the _phylum_ placozoa,  but more were recently discovered. 

There's still only one known species in micrognathozoa, which can be classed as a phyla or class depending on who's doing the classifying.  There are almost certainly other species around that we don't know about though...like placozoans, these things are tiny and hard to find.

Ginkgos are the only species left in their order.