No continuity error - it is just a Lowlander Mantis issue. The Masters
use it as a hook because Che is a Lowlander (and if you want to go
behind this, it shows that they underestimate her/patronise her).
Plural for Mantis - I use Mantids, which sounds right, but isn't
correct as I think it would properly refer to varieties of mantis.
Fabre uses Mantes, which I like, but was felt a bit difficult for
people to get their heads round.
BTW - check out recent postings - another reader is interested in
doing a Wiki - something you might be up for contributing to?