PS: Really nitpicking, it is best not to mix Greek and Latin in one term,
so preferably it is either "monotypic" or "unispecific" ...

Stewart Robert Hinsley schreef
Google: 67 hits for unispecific; 8420 for monospecific. (And 9880 for
monotypic.)
--
Stewart Robert Hinsley

Lycos:
"monotypic": 15414
"monospecific": 5072
"unispecific": 40
Some cross-language hybrids are even more popular, notably "automobile".
This does not mean that a little care in using language is not a good idea.
pvR