Phylum Annelida : The segmented worms
Defining Characteristcs
- protostomes
- true coelom (muscle developed around the gut, more coordinated digestive system and specialization of food tube)
- cephalization - anterior brain
- nervous system has a single ventral nerve cord
- circulatory system (no longer needs diffusion) including 5 aortic arches
- respiration through skin (diffusion)
- hermaphroditic
- sexual reproduction with little regeneration
- simple segmentation
- Nephridia (excretory system)
- 3 classes: Obligochaeta, Polychaeta, Hirudinea
- setae, parapodia
Annelida Lab : Results & Analysis
ANALYSIS
1. The aortic arches (hearts)
2. -Food enters worm through the mouth
-Food travels through pharynx, then gizzard, then crop, into intestine\
-Food exits worm through anus
3. The brain of the earthworm is located anterior in its body, while signals are sent around the body via the ganglion and ventral nerve cord.
4. Nephridia, nephrostome, narrow ciliated tube, brown ciliated tube, wide non-ciliated tube, muscular tube (bladder), and the nephridiopore.
5. By checking inside the digestive system (intestine) for dirt.
6. It allows the earthworm better movement as the setae are able to grip and pull the worm along more efficiently.
7. The gizzard of the worm is able to grind up its food, while the crop is used for storing the food. When the food is ground up by the gizzard, it is easier for the worm to digest and obtain nutrients
8. The intestine would continue all the way down the worm to its anus. I would also observe the worm's nephridia and the ventral nerve cord located under the intestine.
9. The endoderm developed into the lining of the digestive system (intestine, crop, gizzard) as well as the respiratory system. The mesoderm developed into the muscles, reproductive system, and circulatory system and the ectoderm developed into the skin (outer layer) and ventral never cord of the worm.
10. The Nephridium acts as the kidney for the worm and an excretory system. There is one Nephridium for every pair of segments that removes waste from the worm through the Nephridiopore.
11. -similar: both have the defining characteristic of phylum Annelida, both has respiratory, circulatory and digestive system, both have cephalization, nerve cord, anterior brain, a form of setae.
-sand worms have crude gills, parapodia, and shows the beginning of appendage development
12. -both are hermaphroditic, both share the defining characteristics of the phylum Annelida
-leeches have suckers and a mouth which are designed to attract to vertebrates and feed off of their blood. They can also produce a natural toxin that prevents the blood of they are feeding off of from clotting.
2. -Food enters worm through the mouth
-Food travels through pharynx, then gizzard, then crop, into intestine\
-Food exits worm through anus
3. The brain of the earthworm is located anterior in its body, while signals are sent around the body via the ganglion and ventral nerve cord.
4. Nephridia, nephrostome, narrow ciliated tube, brown ciliated tube, wide non-ciliated tube, muscular tube (bladder), and the nephridiopore.
5. By checking inside the digestive system (intestine) for dirt.
6. It allows the earthworm better movement as the setae are able to grip and pull the worm along more efficiently.
7. The gizzard of the worm is able to grind up its food, while the crop is used for storing the food. When the food is ground up by the gizzard, it is easier for the worm to digest and obtain nutrients
8. The intestine would continue all the way down the worm to its anus. I would also observe the worm's nephridia and the ventral nerve cord located under the intestine.
9. The endoderm developed into the lining of the digestive system (intestine, crop, gizzard) as well as the respiratory system. The mesoderm developed into the muscles, reproductive system, and circulatory system and the ectoderm developed into the skin (outer layer) and ventral never cord of the worm.
10. The Nephridium acts as the kidney for the worm and an excretory system. There is one Nephridium for every pair of segments that removes waste from the worm through the Nephridiopore.
11. -similar: both have the defining characteristic of phylum Annelida, both has respiratory, circulatory and digestive system, both have cephalization, nerve cord, anterior brain, a form of setae.
-sand worms have crude gills, parapodia, and shows the beginning of appendage development
12. -both are hermaphroditic, both share the defining characteristics of the phylum Annelida
-leeches have suckers and a mouth which are designed to attract to vertebrates and feed off of their blood. They can also produce a natural toxin that prevents the blood of they are feeding off of from clotting.