Uniramous Arthropods Onychophora, Myriapoda, Hexapoda (Insecta)

Abstract

Arthropods in which:-

• 1. There is one pair of pre-oral appendages which are antenniform and sensory.

• 2. The mandibles bite the food using the tip of the whole limb.

• 3. Except in the Onychophora which show little regional differentiation, the body is divided into two regions (head and trunk) or three regions (head, thorax and abdomen).

• 4. The post-oral appendages of the head all serve as mouth parts; typically there are three pairs, of which the first is usually mandibulate and the remainder assist in feeding.

• 5. The second part of the body (trunk or thorax) always bears the walking legs. The abdomen may or may not bear appendages. The limbs are uniramous.