28 terms

Animal Biology Lab 5

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Phylum Mollusca
bilaterally symmetrical coelomates that illustrates a vast range of morphological types
Four major morphological features that define members of Phylum Mollusca
1. shell
2. mantle
3. visceral mass
4. foot
radula
a protrusible, rasp-like feeding organ
4 Classes under Phylum Mollusca
Class Bivalvia, Class Cephalopoda, Class Gastropoda, Class Polyplacophora
Class Bivalvia
clams, mussels, oysters
3 important features of Class Bivalvia
1. marine and freshwater
2. body compressed between two hinged shells (bivalve)
3. sedentary, filter feeders
Clam structures
incurrent siphon, excurrent siphon, gill, mantle and shell, heart, kidney, foot, visceral mass, adductor muscles, labial palps, mouth, stomach, digestive gland, intestine, gonad
incurrent/ excurrent siphon function
extendable, fleshy tubes that transport water into and out of the body
gill function
used primarily for respiration and filter feeding
mantle function
thin membrane that secretes the shell
shell function
protection
foot function
used for burrowing and locomotion
adductor muscles function
close shell and hold valves tightly together
digestive gland
assists in the chemical breakdown of food
Class Cephalopoda
octopus, squid, nautilus
3 important features of Class Cephalopoda
1. marine predators
2. foot modified into tentacles and arms
3. well-developed eyes
Squid Anatomy Structures
collar, eyes, siphon, mantle, arms, tentacles, fins, gills, rectum, ink sac, retractor muscle, cecum, systematic heart, branchial hearts
siphon function
hollow tube through which water is expelled from the mantle cavity at high velocity to propel the squid through the water
mantle function (squid)
where water is collected and used for propulsion
tentacles function (squid)
used for capturing prey
ink sac function (squid)
used to expel a dark ink cloud in order to confuse predators
Class Gastropoda
snails, slugs, sea slugs, whelks
4 important factors of Class Gastropoda
1. marine, freshwater, and terrestrial species
2. foot well developed
3. when present- shell is univalve
4. herbivores, some carnivores
structures of a Pomacea snail
head, foot, eyes, mantle, tentacles, mouth, shell aperture, operculum
operculum function (snail)
allows snails to resist drying out
Class Polyplacophora
chitons
3 important factors of Class Polyplacophora
1. marine herbivores
2. broad foot
3. shell consist of 7-8 articulation plates
structures on a Chiton
girdle, pallial groove, head, mouth, mantle, food, shell plates, gill, heart/ circulatory system, digestive tract (mouth, intestine, anus)
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