Bauplan isn't jargon, it's German. It's a reflection of the fact that many people doing evolution/ecology research were European.
Hell, in my training I learned to deal with bauplans, along with umwelt, Zeitgebers and Zugunruhe. If you knew the meaning of the terms, you'd know I was trained in ecology and evolutionary biology, with a solid emphasis on behavioral biology and more specifically circadian biology.
I think a word can be jargon AND German. In my case, Zitterbewegung.
metozoan $ sudo su urmetozoan $ ./evolve -R -animalia
what, too geeky?