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25 Cards in this Set

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  • Back
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characteristics of Eucoelomates
organs in fluid as cushion

organs held by vascularized mesentary

muscualar peristalsis

organs free to move and grow
Phylum Molluska is the ________ largest phylum
2nd
Is bilateral symmetry & cephalization is common in P. Molluska ?
yes
Within P. Molluska they possess a _________ digestive tract
complete
Most org. in phylum molluska have what type of circulatory system
open
P. Molluska consist of Protostome Eucoelomates .......T/F
True
Modern molluska are thought to be derived from ___________planeria
marine
P. Molluska .....possess heart, liver, kidney , and gills.......T/F
True
Describe the mantle in P. Molluska
It has 2 folds
and can secrete a protecive shell
how many folds
what kind of shell does it secrete...what purpose does it serve
One who studies shells is refereed to as a ________
malacologist, or the study of is called malacology
Gills w/ incurrent and excurrent flow
o nutrients in
o waste out
o repro products in and out gametes in and out) lies within which cavity ?
mantle
this cavity is also used for Jet propulsion ?
Mantle
all organisms w/in P. Molluska have a well developed head......T/F
False .....some have it some dont
Tentacles are never present in the head....T/F
False
In Phylum Molluska, the head consist of a radula ? describe what it is and also its funtion
Radula
o tongue w/ up to 250,000 teeth …used to scrape algae off of rocks
o rasps food particles from surface
o some bore into or harpoon prey
Foot
tongue...used to scrape what off rocks,
In P. Molluska, the radula can be used to harpoon prey
True
In P. Molluska , the radula can be used as a " foot" T/F
True
Briefly explain the radula ,"being used as a foot" how does it occur? and where is it located?
ventral posterior to mouth

uses the "blood engorgement technique,
the radula can be modified into muscle and tissue funtion.....T/F
false...it can be modified into arms and tentacles
Explain the economic importance of organisms that lie in P. Molluska ?
some use it for food/ and also for their pearls .
Explain the mechanism, and composition of the pearl in P. Molluska?
o defensive against foreign object in mantle cavity,

o layered nacre( calcium carbonate & proteins)
what are some of the economical effects of slugs/snails ?
o garden and agricultural pest
o intermediate host of parasites
agricultural .... and host of _______?
Reproduction wise..........most in P. Molluska are ________ and a few hermaphrodite
• Most dioecious and few hermaphrodite
monoecious or dioecious
Briefly described the AQUATIC FORM reproduction process
egg--→ motile trochophore larva→motile veliger larva-→adult
• some trochopore in egg
• veliger w/ beginnings of foot, mantle and shell
starts off w/ eggs------> motile _______larvae---------> motile ________larvae------> adult
Describe the reproduction process in Chitons
eggs -→ trochopore-→juv-→adult
egg-------> ________. juv--------> ______