Mollusks: Class Gastropoda
What is the radula?
tongue-like organ with tooth-like structures for scraping food
Where are creatures in this class common found?
freshwater and marine terrains
Name 3 examples
squid, octopus, cuttlefish
Name the 3 classes of this phylum.
arachnids, crustacean, uniaramians
Name 3 examples of organisms in this phylum
sea urchin, sea star sea cucumber, sand dollar
Name 3 example of creatures that make up this class.
Slugs, Snails, Lampets
how do organisms move around? there are 3 different ways.
clams/mussels- muscular foot for burrowing
oysters- sessile
scallops- "clap" shell
What ECONOMIC significance do creatures in class gastropoda play?
bait for commercial fisherman
cephalotoxin is used in medicine\
Name 3 common characteristics
jointed appendages
segmented bodies
external skeleton
what are tube feet?
the water vascular system that branches into structures called tube feet that function in locomotion, feeding, and respiration
What ECONOMIC significance do creatures in class gastropoda play?
Name 3 examples
clams, scallops, mussels, oysters
Name a characteristic of this class.
all marine
most complex mollusk
no external shell, have internal support
Name the structure that fuses the head and body together in crustaceans
cephalothorax
what does echinoderm mean?
spiny skin
what is the nephridium?
removes liquid waste, sends to mantle cavity where released to the outside
which structure is the oldest on the shell?
umbo
Which substance in squid is used for medicine?
cephalotoxin
what is the chelicerae arachnids?
feeding pinchers
name 2 common characteristics of echinoderms.
no circulatory system
some can regenerate
what ENVIRONMENTAL significance do creatures in this class play?
slugs destroy gardens, serve as hosts for parasite of man (flukes)
what does dioceous mean?
external fertilization
what ENVIRONMENTAL significance do creatures in this class play?
can be pests in oyster beds eating up profit
what is entomology?
the study devoted to classifying and understanding the biology of bugs
Name 3 functions in tube feet
locomotion, respiration, and feeding