INVERTEBRATES
Nematodes,
Platyhelminthes,
Annelids
GENERAL INFORMATION
Invertebrates- organisms that lack a back bone
Invertebrates are ecotherms (cold-blooded)
Represents 95%-99% of the animal kingdom
Multicellular
No cell walls
VOCABULARY
Parasite- an organism that lives inside of another organism and deprives the host of
nutrients
Osmosis- the diffusion of fluids through membranes or porous partitions
Flame Cells- specialized excretory cell
Hermaphrodite- an organism in which reproductive organs of both sexes are present
Cephalization- development of a head by the concentration of feeding and sensory
organs and nervous tissue at the anterior end
Clitellum- a ring or saddle-shaped region of glandular tissue in the body wall of
certain annelids that produces a mucus to coat and protect eggs
VOCABULARY
Spicules- Provide support in sponges
Polyp- Sessile; attached to one spot
Medusa- Free swimming
Osculum- Pores on sponges that release waste CO2
Filter feed- feed by straining suspended matter and food particles from water
One way digestive system- Mouth that takes in the food and anus is where the food is
disposed
Two way digestive system- Only have one opening that takes in the food and dispossess it
VOCABULARY
Diffusion- Movement of molecules form high to low concentration
Osmosis- Movement of water molecules from high to low concentration
Endoskeleton- Internal skeleton like bony or cartilaginous skeleton
Exoskeleton- Hard outer layer that covers and protects the body
Cephalization- Having a head or not having a head (doesn’t matter)
Asexual-
VOCABULARY
Sessile- Permanently attached not able to move
Asymmetrical- Has a definite shape
Symmetrical- Arrangement of body parts around a center point
Bilateral- Can be divided into two similar halves when a line is drawn through a
specific point
Radial- Can be divided into similar pieces by passing through many points
Clitellum- Forms mucus around the eggs
Nephridia- Excretory system gets rid of nitrogenous
NEMATODA
Symmetry: Bilateral
Movement: Back and fourth thrashing
NEMATODA
Nervous System: Present
Digestive System: One-Way
Excretory System: Present
Circulatory System: Osmosis
NEMATODE
Move by thrashing back and fourth
Rings around nervous system
Lives in soil and water
Parasites
Bilateral symmetry
Lives off plant, insects, animals or humans to survive and reproduce
Grow up to Eight meters
NEMATODA
Respiratory System: Osmosis
Skeletal or support system: No skeletal
system, support through water
Reproductive System: Sexual
ANNELIDS
Symmetry: Bilateral
Movement: Segmented body with 2 sets of muscles
ANNELIDS
Nervous System: Present (Sense organs
and primitive brain)
Digestive System: One-way
Excretory System: Present
Circulatory System: Diffusion
ANNELID
Respiratory System: Diffusion
Support System: Absent
Reproductive System: Sexual
ANNELIDS
Segmented body
Primitive brain
Sense of organs
Live in marine, freshwater and land
Have male and female organs
Have clitellum that forms mucus around eggs
Ring of nerves
EARTH WORM
ROUNDWORMS
Flatworm Diagram
PLATYHELMINTHES
Symmetry: Bilateral
Movement: Controlled by a longitudinal circular layers of muscles
Nervous System: Absent
Digestive System: Two way
PLATYHELMINTHES
Excretory System: Present
Circulatory System: Osmosis/ Diffusion
Respiratory System: Osmosis/ Diffusion
Support or skeleton system: Absent
Reproductive System: Both asexual and sexual
PLATYHELMINTHES
Platyhelminthes means “Flatworm”
Parasitic worms
Live inn any moist areas
Nerve cords go across the body
Five groups of Platyhelminthes
3mm in length
TURBELLARIA
Flat worm tropical environment
TREMATODA
(Fluke) lives in intense conditions
CESTODA
Parasitic flat worm
EXAMPLES OF PLATYHELMINTHES
Tapeworm
Fluke
INTERACTIVE INVERTEBRATES GAMES
http://www.sheppardsoftware.com/content/animals/quizzes/invertebrates/invertebr
ateGame_1.html
http://www.butterflyschool.org/student/invertgame.html
http://sciencespot.net/Media/inverteclassactivity.pdf
https://www.brainpop.com/science/diversityoflife/invertebrates/preview.weml
http://www.biologycorner.com/quiz/phyla.html
INVERTEBRATES FUN FACTS VIDEOS
https://www.youtube.com/watch?v=5E4TsarJk7Y
https://www.youtube.com/watch?v=WVsUkVTjZyg
https://www.youtube.com/watch?v=WVsUkVTjZyg
https://www.youtube.com/watch?v=vHlPNHQ3V94
https://www.youtube.com/watch?v=zWGPu84bLH4
WORKSITE
http://www.phs.d211.org/sped/gavindt/diff%20types%20digestive%20systems.ht
m
http://www.occc.edu/biologylabs/Documents/Cells%20Membranes/Diffusion_Definit
ion.htm
http://www.bbc.co.uk/bitesize/standard/biology/investigating_cells/cells_and_diffu
sion/revision/4/
WORKS CITIED
Dictionary.com. Dictionary.com, n.d. Web. 05 Jan. 2015.
"Invertebrates." UXL Encyclopedia of Science. 2002, "invertebrate." The Columbia
Encyclopedia, 6th Ed.. 2014, "invertebrate." The Oxford Pocket Dictionary of Current
English. 2009, "invertebrate." World Encyclopedia. 2005, "invertebrate." A Dictionary of
Biology. 2004, and AILSA ALLABY;MICHAEL ALLABY. "Invertebrates."
Encyclopedia.com. HighBeam Research, 01 Jan. 2002. Web. 08 Jan. 2015.
"Invertebrates." - Kids Connect. N.p., n.d. Web. 08 Jan. 2015.
WORK CITED
http://www.encyclopedia.com/topic/Platyhelminthes.aspx
http://www.encyclopedia.com/topic/Platyhelminthes.aspx
http://www.livestrong.com/article/62037-characteristics-nematodes/