>         I imagine a plastotype would be a cast of a holotype.    Nu?
                [A mold taken from a primary type]
>         A cotype is a shell where no Hollotype has been designated.
                [A type series, several specimens where none have been selected as the
holotype, also known as syntypes]
>         How 'bout a "hypotype"?
                [a figured or illustrated specimen of a taxon already described in the
literature]
>         We have "Plasto-cotypes"---which you can figure out.
>         What's a --lectoparatype?
                [ What you call the specimens from a group of syntypes when one has been
selected out to be the lectotype, also called paralectotype]
>         What's a plesiotype?
                [ A specimen, designated by a future or subsequent author, to belong to a
particular species]
>         What's a cheirotype?
                [ A type specimen of a species described as a manuscript name...ie. the
name was never validly published]
>         And a neotype?
                [ A specimen selected when no holotype, paratype or syntypes are extant]

Hope that this clarifies things for everyone ;-)

Charlie