Loading presentation...
Prezi is an interactive zooming presentation

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

Invertebrate Evolution

No description
by

Jed Doyle

on 18 August 2015

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of Invertebrate Evolution

Between 600-750 million years ago
Simplest animals
Evolved from
Choanoflagellates
Bunch of cells hanging out together
No symmetry
Diffusion for most body activities
Simple body plans
Pores on outside allow water in
Osculum
allows water out
Choanocytes
help feeding
Amoebacytes
produce
Spicules
Two major types:
Calcarea - Calcium Carbonate Spicules
Hexactinellida - Glass spicules
Cnidaria - "Stinging Creature"
Evolved between 600-750 million years ago
Radially
symmetrical
Hydra and Medusa forms
Only two tissue layers
Epidermis and Gastrodermis
Hydrostatic Skeleton
Gastrovascular Cavity
First to have a nervous system
Nerve Net
Main characteristic -
Cnidocytes
Also known as
Nematocysts
("
Stinging Cells")
Used for defense and prey capture
3 Main Classes
Anthozoa
- Polyp only
Hydrozoa
- Alternate Polyp and Medusa
Scyphozoa
- Only Medusa
Platyhelminthes = "Flat Worms"
Evolved about 550 million years ago
Bilateral symmetry
Parasitic or Free Living varieties
Hydrostatic Skeleton (Water Pressure)
Have
Gastrovascular Cavity
for Digestion
Have
Flame Cells
for Excretion
Definite
Cephalization
More organized Nervous System
Have
Eyespots
for sight and
Auricles
for smell
Generally
Hermaphrodites
Parasitic worms don't have digestive system
Head region (
Scolex
) is attached to
proglottids
Reproductive sections
Pooped out of host
Annelida - "Little Rings"
Segmented worms
Evolved about 520 million years ago
Reproduction is Sexual
Many annelids have a
closed circulatory system
Often have specialized excretory structures
Metanephridia
or
Protonephridia
Relatively complex nervous system
Have
Paired Ganglia
in each segment
Simple eyes in some
Have
chemoreceptors
for smell and taste
True Tissues
Three Tissue Layers
Segmentation
Molting (Ecdysis)
Deuterostomes
Mollusca - "Soft Bodied"
Evolved about 540 million years ago(ish)
Typically have
radula
All have three main parts
Shell
Mantle
Visceral Mass
Most have open circulatory system
Squid and octopus have closed circulatory system
Complete digestive system
Have
Nephridia
for excretory system
Complex brain with
ganglia
3 Classes of Molluscs
Bivalvia
- 2 shells (valves)
Clams, Scallops, Oysters
Gastropoda
- crawl around on belly
Snails and Slugs
Cephalopoda
- fast predators
Squid and Octupus
Nematoda = "Round Worms"
Evolved about 400 million years ago
Roughly half of all species are parasitic
Have a well developed head end
Many have
Stylets

Often have a
Pharynx
Normally no special sense organs
Simple nervous system
"Brain" made of
ganglia
Normally no special respiratory or excretory organs
Sexual Reproduction
Arthropoda - "Jointed Leg"
Evolved about million years ago
Very diverse
Often have 2 or 3 body segments
Many different types of mouthparts
Exoskeleton
Respiration is modified for environment
Aquatics =
gills
Many terrestrial =
trachea
Some terrestrial =
book lungs
Malpighian tubules for excretion
Six main classes
Trilobites - all extinct
Chilopoda
- Centipedes
One pair of legs per segment
One pair of antennae
Carnivores
Diplopoda
- Millipedes
Two pairs of legs per segment
One pair of antennae
Detritovores
Crustacea
- Shrimp, lobsters, crabs
Two pairs of antennae
Lots of legs that are
Biramous
(2 parted)
Insecta
- Insects
One pair of antennae
6 legs
Most have wings
Arachnida
- Spiders, scorpions
No antennae
Modified biting parts called
Chelicerae
Echinodermata = "Spiny Skin"
Evolved about 600 million years ago
Pentaradial Symmetry
Most closely related to us
Starfish, Sea Urchins, Sea Cucumbers
Water Vascular system takes care of many things
Made up of:
Madreporite
Ring Canal
Radial Canal
Tube Feet
Full transcript