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Types of Thumbs

Nonopposable Thumbs: Tarsiers and Marmosets
Nonopposable Thumbs: Tarsiers and Marmosets

Tarsiers and marmosets have non-opposable thumbs. The sub-order Strepsirrhini have pseudo-opposable thumbs and include lemurs, lorises, and galagos. The family Cebidae , also having pseudo-opposable thumbs, is a family of monkeys found in Central and South America, including capuchin and squirrel monkeys.

Opposable Thumbs
Opposable Thumbs

A thumb that can be placed opposite the fingers of the same hand. Opposable thumbs allow the digits to grasp and handle objects, and are characteristic of primates.

Opposable With Comparatively Long Thumbs
Opposable With Comparatively Long Thumbs

opposable, The thumb is the first digit of the hand. ... Old World monkeys and all great apes ** Opposable with comparatively long thumbs: gibbons ...

Pseudo-Opposable Thumbs: all Strepsirrhines and Cebidae
Pseudo-Opposable Thumbs: all Strepsirrhines and Cebidae

However, not all primates have fully opposable thumbs. We can divide the primates into four groups based on their thumbs. Tarsiers and marmosets have non-opposable thumbs. The sub-order Strepsirrhini have pseudo-opposable thumbs and include lemurs, lorises, and galagos. The family Cebidae , also having pseudo-opposable thumbs, is a family of monkeys found in Central and South America, including capuchin and squirrel monkeys.

Related Types