Evaluate Basic External Animal Anatomy and Morphology - AgriSETA

Evaluate Basic External Animal Anatomy and MorphologyPrimary Agriculture NQF Level 1 Unit Standard No: 116173382.3 Mollusca (Phylum)Animals belonging to this group are found on land, in the sea and in fresh water.The name Mollusca comes from the Latin word for “soft”. Most of the time they havea characteristic soft, glandular skin, which is covered by a protective shell. We shallstudy the garden snail.The Snail HabitatSnails are widely distributed. They cause great damage to cultivated plantson farms and in vegetable and flower gardens. Snails thrive during therainy season. Body divisionsThe body of the snail consists of a head at the front, a muscular foot belowand a visceral (body where organs are situated) hump above.The visceral hump contains the internal organs and is usually covered by aprotective shell.Illustration of a snail The headThe head is situated at the anterior end of themuscular foot. At the front is a pair of long tentaclesor feelers and a pair of short tentacles, which serveas organs of touch and smell. At the end of each longtentacle is a black eye, which enables the snail todistinguish between light and darkness. On the frontof the head is the mouth in the shape of a “T”.Version: 01 Version Date: July 2006