Biramous Arthropods Crustaceans

Abstract

Arthropods in which:-

• 1. There are two pairs of pre-oral appendages which are antenniform and sensory.

• 2. The mandibles grind the food by a rolling action of the gnathobase.

• 3. The body is divided into three regions, head, thorax and abdomen, but there is a tendency for the anterior thoracic segments to fuse with the head to form a cephalothorax.

• 4. There are usually at least three pairs of post-oral appendages acting as jaws (mandibles, maxillules and maxillae).

• 5. The trunk appendages are very variable in form and function and typically occur on every segment of both thorax and abdomen. They are typically biramous.