Mollusks and Annelids
Terms in this set (22)
what phylum are mollusks found in?
what is a trochopore?
larval stage, that has a mouth-anus-and cilia, free swimming
what are the habitats are mollusks found in?
marine, freshwater, terrestrial
what are six characteristics of mollusks?
bilateral symmetry, three part body plan, organ systems, must have one or two shells, radula , coelom
what are the three body parts of mollusks?
visceral mass, mantle, foot
what is the visceral mass?
central section that contains the organs
what is the mantle?
outer tissue layer of body attached to visceral mass
what is the foot?
muscular region used for locomotion
what protective structure is formed from the mantle?
how many shells do mollusks usually have?
one or 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?
if they are aquatic then through their gills, if they are terrestrial then through their modified lung
what type of reproduction occurs in mollusks?
what is a nacre?
mother-of- pearl, secretion produced by inner layer irritant, protects soft body, iridescent
what phylum are earthworms found in ?
what is a cerebral ganglion?
a simple brain
what are the four characteristics of Annelids?
segmentation, coelom, organ systems, bristles
what are the two characteristics that classify annelids?
the number of seate on each segment and if parapodia is present
name and describe the Class Polycheata
largest group of annelids, marine worms, ocean, parapodia present, trap food particles from water
name and describe the Class Oligocheata
earthworms, land, no parapodia, no distinctive head region, hydrostatic skeleton, digestive system, hermaphrodites, respire through skin
name and describe the Class Hirundinea
leeches, suckers at both ends of body, flattened, suck blood, no parapodia present or seate