What is the phylum and who are members of the mollusks?
Mollusca, includes snails, squid, octopuses, clams, and oysters
What are the 3 main body characteristics of mollusks?
visceral mass (body cavity w/most of organs), foot, and mantle
What type of symmetry, segmentation, and body cavity do mollusks have?
bilateral symmetry, reduced segmentation, and true coelomates called hemocoel
Who are the members of subcategory bivalvia?
clams, oysters, mussels and scallops
What are the 3 main body characteristics of bivalvia?
two-part shell, muscular foot, and mantle excreting shell to protect
Where do bivalvia live, and can they swim?
Marine animals that live in intertidal zone, most sessile but scallops swim
How do bivalvia digest and excrete food?
- palps (tongue) –> mouth –> esophagus –> stomach
- intestine for absorption
- waste expelled thru anus
How does bivalvia’s circulatory system work?
open circulatory system
* heart found in visceral mass
* vessels, gills, and siphons
Who are the members of subcategory cephalopods?
octopuses, squid, cuttlefish, and nautilus
What are the 3 main body characteristics of cephalopods?
- chitinous beak
- ink sac
- chromatophores
What are the 3 advanced characteristics of cephalopods?
- advanced eye
- ability to learn
- muscular control
How do cephalopods’ radula work?
they inject poison after catching prey with tentacles
Can cephalopods swim?
yes, fast swimmers who use jet propulsion and gills
How do cephalopods reproduce?
sexual + internal fertilization, egg laying
How do cephalopods’ circulatory system work?
closed circulatory system
How do geoducks reproduce?
dioecious + external fertilization
