Cryptic species?

[Jonas Andersson]

(I also posted this question to sci.bio.systematics)

Hi,

Regarding cryptic species (taken to mean one "morpho-species" which
holds many distinct "phylogenetic / biological species"). Do you think
one should be reluctant to describe new species that *are* supported
by the "biological species concept" (mating tests) and by the
"phylogenetic species concept", but which are virtually impossible to
tell apart using morphology only?

Can anyone point me to a few studies where this has been done /
discussed?

Thanks,

JA