There are answers in this site which use the a term similar to "bourne-like shells".
That may raise some natural questions:
Which shells are Bourne-like?
Is the Bourne shell itself also a Bourne-like shell?
If that last question is true, What is the set of "Bourne-like descendants" but excluding the Bourne shell itself called?
We may improve by developing some taxa about shells. Maybe family and specie could be enough. Families:
- Bourne (only the bourne shell)
- csh (csh,es,rc,akanga)
- Ksh (ksh,lksh,mksh, bash)
Maybe a Posix family as well, that should be up for discussion IMhO.