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Phylum Mollusca: mollusks
soft bodied animals; chambered heart but open circulatory system; body structure consists of a visceral mass of organ systems in a soft body; body covered by mantle with secretes the shell; uses a foot for locomotion; protosomes, coelmates; class polyplacophora, gastropoda (snails and their relatives), bivalvia (clams, oysters and relatives) cephalopoda (octopus, squid, nautilus)
Phylum Annelida: annelids
segmented worms; first group to have a true coelom body cavity; closed circulatory system; segmented bodies; protosomes; class oligochaeta, hirudines, polychaeta
largest group of animals; paired jointed appendages; exoskeleton made of chiton (like fungi); segmented bodies sometime in life cycle; open circulatory system
Phylum Arthropoda: Subphylum Chelicerata:
cephalothorax and abdomen; class merostomata (horseshoe crab), class arachnida (spiders, mites, scorpions, ticks, daddy-long legs)
Phylum Arthropoda: Subphylum Crustacea
class malacostraca (lobsters, crabs, shrimp, isopods); Oder Decapoda (fiddler crab)
Phylum Arthropoda: Subphylum Hexapoda
class insecta; head thorax, abdomen, 3 pairs of legs on thorax; trachea; mainly terrestrial
how do fiddler crabs affect the growth of marsh grasses
as they burrow deep into the mud of the marshes, the crabs collectively create a maze of tunnels which directly affect the growth of marsh grasses through aeration
male fiddler crabs wave and tap their large cheliped to do what
challenge other males to fight to impress the females
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