Chapter 33 Invertebrates

Front 1

invertebrates

Back 1

- sponges
- cnidaria
- lophotrochozoa
- ecdysozoa
- deuterostoma

Front 2

phylum sponges

Back 2

- no true tissues
- suspension feeder
- have osculum (opening), choanocytes (filter water)

Front 3

pylum cnidaria

Back 3

- diploblastic (muscle and nervous tissue)
- hydras, corals, jellies, anemonies.
- two forms: medusa, polyp
- have gastrovascular cavity.

Front 4

lophotrochozoa

Back 4

- triploblastic, bilateral symmetry.
- protostome
- phyla: platyhelminthes, mollusca, annelida.

Front 5

phyla platyhelminthes

Back 5

- flatworms, tapeworms
- found in moist wet habitats.
- free living
- parasitic
- body stucture: acoelomate, gastrovascular cavity, bilateral symmetry
- example: planaria (flat)

Front 6

phylum mollusca

Back 6

eumetazoa -> triploblasic -> protostome -> lophotrochozoa.
- chitons, snails, slugs, oysters, octopi, squids
- soft, unsegmented body
- most have a hard shell
- wide range of lifestyles: algae scrapers, suspension feeders, predators.
- body plan: unsegmented, muscular foot, visceral mass, alimentary canal, mantle

Front 7

phylum annelida

Back 7

- eumetazoa -> triploblastic -> protostome -> lophotrochozoa.
- segmented worms
- marine, fresh water, moist soils
- wide variety of lifestyles: suspension feeders, substrate feeders, parasites, predators.
- body plans: segmented (cephilization)

Front 8

ecdysozoans

Back 8

- eumetazoa -> triploblastic -> protostome -> ecdysozoan
- shed a cuticle as they grow
- wide range of body forms
- phyla: nematoda, arthropod.

Front 9

phyla nematoda

Back 9

- eumetazoa -> triploblastic -> protostome -> ecdysozoan -> nematoda
- everywhere
- free-living decomposers
- parasies
- body plan: unsegmented, alimentary canal, pseudocoelom

Front 10

phyla arthropoda

Back 10

- A LOT of species
- body plan: segmented body, hard exoskeleton, jointed appendages, alimentary canal.
- two groups: insects, and crustacea.

Front 11

characteristics of insects

Back 11

- evolution of flight: wings are cuticle extensions
- WATER CONSERVATION - excretory system (malpighian tubules)

Front 12

insect morphology (body structure)

Back 12

- segmented: head, thorax, abdomen

Front 13

insect reproduction

Back 13

- sexual reproduction
- internal fertilization
- sperm is saved so that it may be used for future fertilization
- most lay eggs

Front 14

insect growth

Back 14

- shed their cuticle as they grow (molting)
- undergo metamorphosis (either complete or incomplete)

Front 15

incomplete metamorphosis

Back 15

- only three stages
- egg -> nymph -> adult
- wing size changes

Front 16

complete metamorphosis

Back 16

- four stages
- egg-> larvae -> pupa -> adult

Front 17

significance of insects

Back 17

- pollination
- crop damage
- carry disease

Front 18

crustacea

Back 18

- water equivalent of insects
- eumetazoa -> triploblastic -> ecdysozoa -> crustacea
- range in size (krill to crabs)

Front 19

echinodermata

Back 19

- eumetazoa -> triploblastic deuterostome -> echinodermata
- spiny skin
- examples: sea stars, brittle stars, sea urchins, sand dollars, sea cucumbers.

Front 20

echinodermata morphology and mode of life

Back 20

- 5 sided
- radial symmetry (larvae have bilateral symmetry)