There are approximately 11 species and subspecies in this genus: T. angusta · T. bulloides · T. conica · T. decurrens · T. humilis · T. inflata · T. linea · T. maxima · T. nana · T. nanus · T. palaeotrochus
There are approximately 10 species and subspecies in this genus: T. dumbletonensis · T. dunrobinensis · T. inopinata · T. jonica · T. schopeni · T. subconcinna · T. tetraedra · T. tetrahedra · T. triplicata · T. triplicate
Accessed through GBIF Data Portal March 18, 2008:
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