Evaluate Basic External Animal Anatomy and Morphology - AgriSETA
Evaluate Basic External Animal Anatomy and Morphology - AgriSETA
Evaluate Basic External Animal Anatomy and Morphology - AgriSETA
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<strong>Evaluate</strong> <strong>Basic</strong> <strong>External</strong> <strong>Animal</strong> <strong>Anatomy</strong> <strong>and</strong> <strong>Morphology</strong>Primary Agriculture NQF Level 1 Unit St<strong>and</strong>ard No: 116173352.2 CrustaceaThe Crustacea are well known animals <strong>and</strong> spend most of their lives in water. Theyinclude animals like lobsters <strong>and</strong> crabs. We will study the crab.The Crab HabitatWe find crabs in the sea <strong>and</strong> in various fresh water rivers, dams, pools <strong>and</strong>places where there is constant water. Body divisionsThe body of a crab is divided into two clearly defined regions, thecephalothorax (cephalo = head / thorax = chest - meaning the head <strong>and</strong>chest parts are one) <strong>and</strong> the abdomen (the part of the body that liesbetween the chest (thorax) <strong>and</strong> the beginning of the legs (pelvic area)).The abdomen is folded in under the cephalothorax. The crab has acalcareous (hard calcium rich) exoskeleton (hard structure on the outsideof the body). The body wall is not hardened in certain areas <strong>and</strong> will allowlittle movement. Movement can take place at the joints of the legs <strong>and</strong>between the segments of the abdomen.• The cephalothoraxThe head <strong>and</strong> thorax are fused together to form the cephalothorax thatmakes up the upper part of the body. It is broad <strong>and</strong> flattened from topto bottom. The upper part (surface) of the cephalothorax is coveredwith a shell like shield called the carapace.The following can be found on the cephalothorax:oThe antennaeIn the middle of the cephalothorax at the front are one pair oflong antennae <strong>and</strong> one pair of short antennae. They serve asorgans of touch <strong>and</strong> smell.Version: 01 Version Date: July 2006