Defining characteristics
- heterotrophic
- multicellular
- invertebrates
- large ventral muscular foot
- visceral mass located dorsal to the foot
- mantle
- 4 classes; Polyplacophora, Gastropoda, Bivalvia, Cephalopoda
- filter feeders and gills for respiration (as seen in Bivalvia)
- shells (not always)
- radula
- 8 dorsal plates as seen in Polyplacophora, as well as segmentation and radula scapers
- vertebrate eye, greatly reduced shell, motile predators, capable of learning (as seen in Cephalopoda)
- triploblastic
- bilateral symmetry
- true coelom
- food tubes with a mouth and anus
- open circulatory system (except in squid and octopus)
- no skeleton
- heterotrophic
- multicellular
- invertebrates
- large ventral muscular foot
- visceral mass located dorsal to the foot
- mantle
- 4 classes; Polyplacophora, Gastropoda, Bivalvia, Cephalopoda
- filter feeders and gills for respiration (as seen in Bivalvia)
- shells (not always)
- radula
- 8 dorsal plates as seen in Polyplacophora, as well as segmentation and radula scapers
- vertebrate eye, greatly reduced shell, motile predators, capable of learning (as seen in Cephalopoda)
- triploblastic
- bilateral symmetry
- true coelom
- food tubes with a mouth and anus
- open circulatory system (except in squid and octopus)
- no skeleton
Clam workshop lab
Squid dissection
Analysis
1. The arms of a squid longer than tentacles and are typically used to grab prey and hold on to it. Arms have suckers all the way down the length of the arm; whereas tentacles only have suckers near the end. (Both have suckers that can be used to capture prey). There are 8 arms and 2 tentacles. Tentacles can also play a part in reproduction.
2. Cephalopods have a vertebrate eye and are capable of learning, two traits not shared with the bivalves. They are also extremely motile predators and have a greatly reduced shell, something we also don't see in bivalves. Both cephalopods and bivalves have a ventral muscular foot, a visceral mass. and a mantle.
3. My squid was a girl, this was determined by viewing her clear ovaries.
4. Food enters the squid through it's mouth and travels to the stomach where it's digested. Nutrients are carried throughout the bloodstream and are absorbed. Any leftover waste is excreted through the anus.
5. The transfer of oxygen is much faster as the distance between the heart and the gills is diminished, This allows for a more efficient system of oxygen and carbon dioxide transfer between the branchial hearts and the gills.
1. The arms of a squid longer than tentacles and are typically used to grab prey and hold on to it. Arms have suckers all the way down the length of the arm; whereas tentacles only have suckers near the end. (Both have suckers that can be used to capture prey). There are 8 arms and 2 tentacles. Tentacles can also play a part in reproduction.
2. Cephalopods have a vertebrate eye and are capable of learning, two traits not shared with the bivalves. They are also extremely motile predators and have a greatly reduced shell, something we also don't see in bivalves. Both cephalopods and bivalves have a ventral muscular foot, a visceral mass. and a mantle.
3. My squid was a girl, this was determined by viewing her clear ovaries.
4. Food enters the squid through it's mouth and travels to the stomach where it's digested. Nutrients are carried throughout the bloodstream and are absorbed. Any leftover waste is excreted through the anus.
5. The transfer of oxygen is much faster as the distance between the heart and the gills is diminished, This allows for a more efficient system of oxygen and carbon dioxide transfer between the branchial hearts and the gills.