Porifera, Cnidaria, Platyhelminthes, Nematoda, Rotifera

Question 1

Porifera

Answer 1

sponges
simplest most primitive phylum

Question 2

Porifera characteristics

Answer 2

Parazoa ( no tissues)
Asymmetrical
Intracellular digestion: flow of water through body to gain food
Reproduction: asexual- budding or fragmentation, sexual: hermaphrodites release either sperm or eggs
Suspension feeds
sessile: don’t move
choanocyte: cells that have flagella move water in and out
spicules: sharp needle like structures

Question 3

Cnidaria

Answer 3

Jellyfish, coral, hydras

Question 4

Cnidaria characteristics

Answer 4

Diploblasts (metazoa)
No coelom
radial symmetry
Incomplete digestive tract (two way digestion)
Reproduction: sexual and asexual
polyp (sessile) stage
Medusa (mobile) stage
Nerve net: primitive nervous system
Hydrostatic skeleton: helps locomotion
Cnidocytes: cells that have nematocysts (stinging structure)

Question 5

Platyhelminthes

Answer 5

Trematodes, tapeworms, flat worms

Question 6

Platyhelminthes characteritics

Answer 6

triploblastic (metazoa)
Acoelmates- no coelom
bilateral symmetry, cephalization
incomplete digest tract
reproduction: sexual (hermaphrodites), asexual
Two nerve cords: collection of nerves, splan length of body
Excretory system- protonephridia: collection of flame cells
Flame cells: aid in osmoregulation

Question 7

Nematoda

Answer 7

Round worms, hook worms

Question 8

nematoda characteristics

Answer 8

triploblastic- psuedocoelomate
bilateral symmetry
complete digestive tract (mouth and anus)
Reproduction: monoecious, parthenogenic)
exoskeleton cuticle that can be shed in a process called ecdysis

Question 9

Rotifera

Answer 9

Small microscopic animals

Question 10

Rotifera characteristics

Answer 10

triploblastis- psuedocoelomates
bilateral symmetry
complete one way digestion (mouth and anus)
Corona: structure that has cilia to sweep food into mouth
Reproduction: sexual, parthogenic
Flame cells for osmoregulation (excretion)