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Mollusk and Annelid
Terms in this set (22)
What phylum are mollusks found in?
What is a trochophore?
Has mouth, anus, cilia
Free-swimming with use of cilia
Give the habitats in which mollusks are found.
Give six characteristics of mollusks.
most have shells (1-2)
Three-part body plan
Name and describe the three body parts of a mollusk.
Visceral mass - central area that contains the organs
Mantle - outer tissue layer connect to the
Foot - muscular region
What protective structure is formed from the mantle?
How many shells do mollusks have?
one to two
What primary structures are used for excretion in mollusks?
What type of circulatory system do mollusks have?
open circulatory system
How does respiration occur in mollusks?
aquatic - gills located in mantle cavity
terrestrial - modified lung (thin membrane)
What type of reproduction occurs in mollusks?
Name and describe organisms in the Class Gastropoda.
Name and describe organisms in the Class Bivalvia.
Name and describe organisms in the Class Cephalopoda.
What is nacre?
mother-of-pearl secretion produced by inner layer around irritant, protects soft body, iridescent
What phylum are earthworms found in?
Describe a cerebral ganglion.
Name four characteristics of annelids.
Segmentation, Coelom, Organ systems, Bristles
What are the two characteristics that classify annelids?
number of setae and presence or absence of appendages (parapodia)
Name and describe organisms in the Class Polychaeta.
largest group of annelids, marine worms, ocean, parapodia present, trap food particles from the water
Name and describe organisms in the Class Oligochaeta.
earthworms, land, no parapodia, no distinct head region, hydrostatic skeleton, digestive system, hermaphrodites, respire through skin
Name and describe organisms in the Class Hirudinea.
leeches, suckers at both end of body, flattened, suck blood, no parapodia or setae
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