Complex sentence: In fact, over 20 years few studies have been done on "T. bancanus" and a taxonomic revision based upon intensive and systematic field surveys is overdue.These species should be treated as distinct and named as separate taxa until more definitive evidence is available.
Split into simpler sentences: In fact, over 20 years few studies have been done on "T. bancanus" and a taxonomic revision based upon intensive and systematic field surveys is overdue. These subspecies should be treated as distinct and named as separate taxa until more definitive evidence is available.