Multiple classification schemes based on a variety of morphological and anatomical characteristics have been proposed, but none are fully accepted.

It is adapted to life in the Arctic, so has a number of anatomical and physiological characteristics that differentiate it from other cetaceans.

Several anatomical characteristics differentiate Mesoeucrocodylia from the other crocodylomorph clades.

Members of this family have been given the common name "lancetooth" snails, presumably based on this last anatomical characteristic.

The unique anatomical characteristics uniting these two groups have been well documented and recognized for years.

Cope describes the anatomical characteristics and superficial characteristics, comparing them with other related Bufo species.

The earliest known bird, Archaeopteryx, lived about 145 million years ago and had many anatomical characteristics in common with dinosaurs.

Its unique anatomical characteristics have caused it to be classified in its own genus (Hydropotes).

A mistake happened because he was not able to examine different anatomical characteristics.

This anatomical characteristic was taken again when the three models of the Colt Derringer started production in 1870.