Name Class Date Chapter 28 Arthropods and Echinoderms Section 281 Introduction to the Arthropods (pages 715719) This section identifies the main features of arthropods. It also describes the important.

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What characteristics do biologists use to classify arthropods?

What characteristics do biologists use to classify arthropods? Arthropods are classified based on the number and structure of their body segments and appendages particularly their mouthparts.

They have a segmented body with a hard exoskeleton. They also have jointed appendages. The body segments are the head, thorax, and abdomen (see Figure below). In some arthropods, the head and thorax are joined together as a cephalothorax.

The arthropod body plan consists of segments, each with a pair of appendages. The rigid cuticle inhibits growth, so arthropods replace it periodically by moulting. Arthropods are bilaterally symmetrical and their body possesses an external skeleton. Some species have wings.

Overall Body PlanInsects have three major body regions: head, thorax, and abdomen (see Insect Body Regions, right). The head is made of 5-7 fused segments and bears the eyes, antennae, and mouthparts. The thorax consists of three segments called the pro-, meso-, and metathorax.

Arthropods are covered with a tough, resilient integument or exoskeleton of chitin.

What is the basic body plan of all arthropods? segmented body, tough exoskeleton, and jointed appendages. exoskeleton. it is made from protein and carbohydrates and it is what the arthropod exoskeleton is made up of.

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