Invertebrates

Question 1

Porifera (sponges)

Answer 1

live in fresh and marine water

lack true tissue and organs

Question 2

Cnidarians

Answer 2

sessile (polyp) and motile (medusa) forms
simple- diploblastic and radial body plan
have GVC
4 classes of cnidarians include: cubazoa, hydrozoa, scyphozoa, staurozoa

Question 3

lophotrochozoan

Answer 3

bilateral animals- triploblastic

Question 4

Platyhelminthe (flatworm)

Answer 4

acelomates although have tripoblastic
fine branches of GVC and gas exchange through protonephridia

Class:
turbellarians: scavengers and predators in marine, reproduce sexually and asexually
monogeneans and termatodes: parasites in or on animals
cestoda: parasites of vertebrates and lack digestive system

Question 5

Molluscs

Answer 5

most are marine
soft bodied animals protected by a hard shell
BODY PLAN:muscular foot, visceral mass and mantle( water filled)
Class:
Chitons: oval shaped, no head just foot for movement
Gastropods: freshwater/teresstrial and have single spiral shell. torsion( anus above mouth)
Bivalves: clams and oysters. 2 hard shells
Cephalopods: squid and octopus: beaklike jaw and tentacles …ammniotes(shelled) where common but went extinct.

Question 6

Annelids

Answer 6

cephilization, complete gut, circulatory system and bilateral symmetry
Class:
oligochaetes: earthworms-eat through soil
leeches: hirudin
Polychaetes: parapodia made of chitin to aid locomotion

Question 7

ecdysozoans

Answer 7

tough cuticle
cuticle molted
nematodes and arthropodes

Question 8

Nematodes (roundworms)

Answer 8

cuticle shed when it grow
nutrients through body fluid via pseudocoelom
thrashing motion

Question 9

Arthropods

Answer 9

• segmented body and hard exoskeleton
• joined appendages little variation from segment to segment covered by complete cuticle
• open circulatory system- hemolymph

Question 10

Arthropods: Cheliceriforms

Answer 10

clawlike feeding appendages, ex: horseshoe crab and sea spider
arachnids: spiders– have book lungs(where gas exchange happenes)

Question 11

Arthropods: Myriapods

Answer 11

jaw-like mandibles

milipedes and centipedes

Question 12

Arthropods: Hexapoda

Answer 12

insects:
flight
exoskeleton 
tracheal system for gas exchange
complete metamorphasis vs incomplete( associated with young)

Question 13

Arthropods: crustaceans

Answer 13

2 branched appendages
endopod: swimming
exopod: gill
Isopods: small
DecapodsL large lobsters and crabs
Copepods: planktonic

Question 13

Choanocytes

Answer 13

Line GVC and capture food particles

Question 14

Amoebytes

Answer 14

Channel the engulfed food and carry nutrients to cells