Defining characteristics
- invertebrates
- multicellular
- heterotrophic
- true coelom, muscle around gut
- coordinated digestion
- specialization of food tube
- single ventral cord nervous system
- anterior brain
- circulatory system with 5 hearts
- respiration through skin by diffusion
- sexual reproduction
- hermaphroditic
- unspecialized segmentation
- 3 classes; Oligochaeta, Polychaeta, Hirudinea
- nephridia
- setae, parapodia
- bilateral symmetry
- simple segmentation
- food tubes with a mouth and anus
- closed circulatory system
- no skeleton
- invertebrates
- multicellular
- heterotrophic
- true coelom, muscle around gut
- coordinated digestion
- specialization of food tube
- single ventral cord nervous system
- anterior brain
- circulatory system with 5 hearts
- respiration through skin by diffusion
- sexual reproduction
- hermaphroditic
- unspecialized segmentation
- 3 classes; Oligochaeta, Polychaeta, Hirudinea
- nephridia
- setae, parapodia
- bilateral symmetry
- simple segmentation
- food tubes with a mouth and anus
- closed circulatory system
- no skeleton
Annelida Lab
Analysis
1. The aortic arches
2. The food enters through the mouth into the pharynx, where it then goes through it's esophagus, into the crop, into the gizzard, into the intestine, then out through the anus. (during which the worm acquires vital nutrients for it's survival)
3. In the earthworm, we see cephalization which includes an anterior brain. This brain is above the pharynx and is connected to the ventral ganglion nerve that controls sensory information within the worm.
4. Nephridia , nephrostome, narrow ciliated tube, brown ciliated tube, wide non-ciliated tube, muscular tube (bladder), and the nephridiopore.
5. By cutting open the worms intestinal region and viewing the presence or lack of dirt within.
6. The setae play an integral part of the worm's movement, acting as grip like surfaces for the worm to create traction with; resulting in its transportation.
7. The crop of the earthworm is able to store this food, where the gizzard is able to grind the food up so it can be used as nutrients. The small, broken up pieces are the nutrients that are able to be digested by the worm.
8. I would observe the continuation of the intestines, the nephridia, the continuation of the ventral nervous cord, and the anus.
9. The endoderm develops into the digestive and respiratory system. The mesoderm develops into the reproductive and circulatory system, muscles, and the coelom. The ectoderm develops into the outer layer of the worm and the nervous system.
10. The nephridium is primarily the "kidney" of the earthworm. The nephridia work as specialized excretory units in pairs of each segment of the earthworm that get rid of metabolic wastes. It does this by passing the waste through multiple tubes in the worm, then releasing it through the nephridiopore.
11. - the sandworm have parapodia, which are modified setae
- the sandworm has crude gills
- the sandworm has the beginning of an appendage development
- both the sandworm and earthworm have a digestive system, brain, some form of setae, and more.
12. - both are hermaphroditic
- both have a citella
- leeches have a differing type of segmentation
- the coelom of a leech is far more dense with connective tissue than the coelom of an earthworm
Leeches have specific mouthparts and suckers adapted to feeding off the blood of various organisms that grant them their ectoparasitic nature. The pharynx of the leech is located right behind the blades within the leech's mouth, where blood is enabled to pass through into the crop and gizzard to then be digested.
1. The aortic arches
2. The food enters through the mouth into the pharynx, where it then goes through it's esophagus, into the crop, into the gizzard, into the intestine, then out through the anus. (during which the worm acquires vital nutrients for it's survival)
3. In the earthworm, we see cephalization which includes an anterior brain. This brain is above the pharynx and is connected to the ventral ganglion nerve that controls sensory information within the worm.
4. Nephridia , nephrostome, narrow ciliated tube, brown ciliated tube, wide non-ciliated tube, muscular tube (bladder), and the nephridiopore.
5. By cutting open the worms intestinal region and viewing the presence or lack of dirt within.
6. The setae play an integral part of the worm's movement, acting as grip like surfaces for the worm to create traction with; resulting in its transportation.
7. The crop of the earthworm is able to store this food, where the gizzard is able to grind the food up so it can be used as nutrients. The small, broken up pieces are the nutrients that are able to be digested by the worm.
8. I would observe the continuation of the intestines, the nephridia, the continuation of the ventral nervous cord, and the anus.
9. The endoderm develops into the digestive and respiratory system. The mesoderm develops into the reproductive and circulatory system, muscles, and the coelom. The ectoderm develops into the outer layer of the worm and the nervous system.
10. The nephridium is primarily the "kidney" of the earthworm. The nephridia work as specialized excretory units in pairs of each segment of the earthworm that get rid of metabolic wastes. It does this by passing the waste through multiple tubes in the worm, then releasing it through the nephridiopore.
11. - the sandworm have parapodia, which are modified setae
- the sandworm has crude gills
- the sandworm has the beginning of an appendage development
- both the sandworm and earthworm have a digestive system, brain, some form of setae, and more.
12. - both are hermaphroditic
- both have a citella
- leeches have a differing type of segmentation
- the coelom of a leech is far more dense with connective tissue than the coelom of an earthworm
Leeches have specific mouthparts and suckers adapted to feeding off the blood of various organisms that grant them their ectoparasitic nature. The pharynx of the leech is located right behind the blades within the leech's mouth, where blood is enabled to pass through into the crop and gizzard to then be digested.