Brief summary: the ANnelids
Annelids are bilaterally symmetrical segmented worms. There are over 22,000 species in this phylum. This phylum includes ragworms, leeches and earthworms. These earthworms are the normal ones found in gardens and in the soil around town. The body of an annelid is a cylindrical segmented body. The digestive system is almost identical to those explained before in the nematodes, but there are minor differences in placement.
This simple digestive system is a long, unsegmented gut traveling from the mouth to the anus through the middle of the body. The digestive tract begins when the worm eats its food through the mouth in the front of the animal, under the head. Earthworms and other worms living in the earth usually eat any organic matter underground and usually in the soil. The good is usually passed through the body using many different parts of the system to break down and release vitamins and minerals throughout the body for use. Broken down food is usually passed through the intestine which is held in place by the coelom, a fluid filled cavity. Eventually, the waste is passed out from the anus.
The annelids are the most complex phyla out of the three Phyla worked under the Raslowsky column. It differs mainly from Platyhelminthes because it has an anus and a mouth, while Platyhelminthes only has a mouth which it uses for both its mouth and anus, as mentioned before. Most of the differences between these three phyla were mentioned before in the Nematoda section with differences, but this Phyla is a little more complex. This Phyla includes a crop, gizzard and pumping vessels to move the food swiftly and efficiently through the segmented body. All three of these phyla are a bilaterally symmetrical worm.
This simple digestive system is a long, unsegmented gut traveling from the mouth to the anus through the middle of the body. The digestive tract begins when the worm eats its food through the mouth in the front of the animal, under the head. Earthworms and other worms living in the earth usually eat any organic matter underground and usually in the soil. The good is usually passed through the body using many different parts of the system to break down and release vitamins and minerals throughout the body for use. Broken down food is usually passed through the intestine which is held in place by the coelom, a fluid filled cavity. Eventually, the waste is passed out from the anus.
The annelids are the most complex phyla out of the three Phyla worked under the Raslowsky column. It differs mainly from Platyhelminthes because it has an anus and a mouth, while Platyhelminthes only has a mouth which it uses for both its mouth and anus, as mentioned before. Most of the differences between these three phyla were mentioned before in the Nematoda section with differences, but this Phyla is a little more complex. This Phyla includes a crop, gizzard and pumping vessels to move the food swiftly and efficiently through the segmented body. All three of these phyla are a bilaterally symmetrical worm.