Clarification RE: Megatherium's ability and insect repellant

[Infernoraptor (GEWP)]

What qualifies as an "insect" RE megatherium and insect repellant?
Sure, titanomyrma, meganeura, are pretty obvious and easy to test against, but I'm not sure about the others.
Is it simply a matter of what does/doesn't drop chitin? Does it differ between the two? (This could be awkward if insect repellant worked against dunkleosteus). Most important, does megatherium work against leeches?
Sorry if this has been answered but I didn't see it in the search or on reddit and no one in my server knew.
Thanks

[Forger of Souls]

Insects, are, according to insect replent, spiders, centipedes, scorpions, the ants, the dragonflies, mantis, and the dung beetle. Haven't tested it against he water/oil jug bugs and moth from SE yet, mostly because, you don't need/want replent with those creatures.

[Kraken:1]

Megatheriums will get the rage buff when killing Meganeura, Ants, Scorpions, Spiders, Arthropleura and Mantis. Wild one's will go beserk just by being in proximity to them and will go on a rampage and attack everything they see, starting with the bugs.

Bug repellent make you invisible to Meganeura, Ants, and Leeches unless you attack them, and makes it so that Spiders, Bats, Mantis, Arthropleura, and Mantas will only aggro on you if you get really close to them.

[Forger of Souls]

Originally posted by Kraken:1:

Megatheriums will get the rage buff when killing Meganeura, Ants, Scorpions, Spiders, Arthropleura and Mantis. Wild one's will go beserk just by being in proximity to them and will go on a rampage and attack everything they see, starting with the bugs.

Bug repellent make you invisible to Meganeura, Ants, and Leeches unless you attack them, and makes it so that Spiders, Bats, Mantis, Arthropleura, and Mantas will only aggro on you if you get really close to them.

Ah, right, forgot about Leeches.

And no, despite technically being insects, Deathworms are not affected.