Currently, the family is divided into four subfamilies, many genera and more than 2000 known species.

Porpoises, divided into six species, live in all oceans, and mostly near the shore.

Sufficient biodiversity can eventually divide one species into two or more species.

Plants within the tribe are present nearly worldwide divided into 170 genera and more than 2,800 species.

The Scalopininae are divided into two tribes, five genera, and seven species:

Boyd divided the world population into 13 geographically distinct species with slightly different frequency distributions of blood group genes.

The large range in leaf variation once divided T. latifolia into more than 10 species when in fact they are all one.

The giant hutias are divided into two subfamilies, five genera, and six species.

The genus is divided into two species and either four or five subspecies.

The family is divided into three subfamilies, 17 genera and 46 species.