Invertebrate Phyla

Porifera

Annelida

Cnidaria

Platyhelminthes

Arthropoda

Echinodermata

Mollusca

Examples: Seasponge

Porifera means pore bearing

Asymmetry(none)

Sessile: live attached to a surface

Dont have nerve cells or tissue

FIlter feeders/ hermaphrodites

Can reassemble when fragmented

Ex: Segmented Worms, earthworms, leeches

Examples: Snails Clams Octopus Squid

Body is divided into many sections
complete digestive tract

  1. Pharynx
    2.Esophagus
  2. Crop
  3. Gizzard
  4. Intestine
    Closed circulatory system
    Blood stays within vessels
  5. Main Vessel is dorsal
  6. 5 aortic arches
    Earth worm is a hermaphrodite

Ex: Coral Jellyfish Sea Annenomea

Cnidocytes: cells that contain stinging poisonous barbs which the use to paralyze prey
Radial symmetry (division of 5 equal parts)
2 body forms:
Polyp: sessile, tentacles up- coral hydra

arthropod

Largest Phylum
Characteristics:
Exoskeleton
Doesn't grow so it must shed
Paired jointed appendages
segmentation
open circulatory system
Ventral nerve cords

Examples: Falt worms, tapeworms, fluke

Many parasitic forms which causes different diseases in humans and livestock
Bilateral symmetry and Cephalization which is the concentration of sensory organs and nervous tissue in the head
One digestive opening to take in food and release waste
Most are hermaphrodites

Name means skinny spine
Marine environment
Radial symmetry
Body parts are usually in pairs of 5's
Water vascular system
Tube feet

Have true coelom (Body Cavity)


Muscular foot- used for motion or attachment
Mantle soft outer layer
Visceral Mass- contains most of the organs
Gills/ lungs
Most have different sexes but some are hermaphrodites

Platyhelminthes

porifera

Echinodermata

cnidaria

ANNELID

Main groups:
1.Gastropods
univalves- one shell, breathe with lungs
bivalves- 2 shells, breathe with gills

  1. cephlopods

molluska

Examples: Starfish, Sea Urchins, and sea cucumbers

Examples: Centipedes, millipedes, scorpions

Centipede/ millipedes

  1. most primitive arthropods
  2. obvious segmentation
  3. centipedes (Class Chilipoda
    Millipedes (Class Diplopoda)
    a. Two pairs of legs per segment
    b. one pair of short antennae
    Crustaceans
    Most are marine
    2 body regions
  4. Cephalothorax
  5. Abdomen
    2 pairs of antennae
    Swimmerets- appendages on abdomen used for swimming
    Breathes by gills attached to swimmerets
    One pair of large claw and 4 pairs of walking legs