intro to invertebrates
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Intro to Invertebrates . Chapter 25 Sections 1 & 2. Invertebrates (inverts) include all animals that lack a backbone, or vertebral column. This includes 33 Phyla. Phylum Porifera. The term Porifera means “pore-bearers” in Latin. This phylum includes Sponges. - PowerPoint PPT PresentationTRANSCRIPT
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Intro to Invertebrates Chapter 25
Sections 1 & 2
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O Invertebrates (inverts) include all animals that lack a backbone, or vertebral column.O This includes 33 Phyla
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Phylum PoriferaO The term Porifera means “pore-
bearers” in Latin.O This phylum includes Sponges.O Most ancient member of the
Kingdom Animalia.O One of the most simple organisms
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Phylum CnidariaO Organisms include jellyfish,
anemones, hydra, and coral.O These organisms are always aquatic.O Can live in giant colonies such as the
Great Barrier Reef
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http://www.youtube.com/watch?v=by1S-kZ4gN4
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Phylum NematodaO Range in size from microscopic to 1
meterO Can live on land and in water.O Some are parasiticO Closely related to the phylum
Arthropoda
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O http://www.youtube.com/watch?v=SpgjnXEFadg
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Phylum Platyhelminthes
O Commonly known as flatworms.O They are the most simple animals to
have 3 germ layers. O Most are only 3mm thick.
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O http://www.youtube.com/watch?v=mh2dTIRReXU
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Phylum AnnelidaO Includes organisms such as
earthworms and leechesO The word Annelida means little ring
in Latin
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Phylum MolluscaO Includes both marine and terrestrial
organismsO Ex. Snails, clams, squid, and octopiO Have a larval stage in developmentO Typically have an internal or external
shell
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O http://www.youtube.com/watch?v=WqMNjUp6UeA
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EchinodermataO Echino- means spiny in Greek and
Detmis- means skin (spiny skin)O Includes sea urchins, sand dollars,
and Sea StarsO Only live in the seaO Have a structure called “tube feet”
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Body Plans of InvertsO Body Symmetry
O Radial Symmetry- a number of imaginary planes drawn through the center of the body will divide the organism in equal halves.O Ex: Sea Stars, Sea Anemone, and Jelly
Fish
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O Bilateral symmetry- a single imaginary plane divides the body into left and right sides that are mirror images of each other.O Lobster, earthworms, snails
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O Germ Layers-during embryonic development the cells of most animals differentiate into 3 layers, called germ layersO Endoderm- is the inner most layer
and develops the lining of the digestive tract and much of the respiratory system.
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O Mesoderm- middle layer that gives rise to muscles and much of the circulatory, reproductive, and excretory systems.
O Ectoderm- outermost layer that produces sense organs, nerves, and the outer layer of the skin
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O Body Cavities- a fluid-filled space between the digestive tract and the body wallO The most complex organisms have a
true coelom, which is a body cavity that develops within the mesoderm and is completely lined.
O Pseudocoelom is a partially lined body cavity
O Acoelom there is no body cavity present.
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O Segmentation- repeated parts on an animal. Most have repeated body parts on the inside also.
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O Cephalization- The concentration of sense organs and nerve cells at the organisms anterior end. (to have a head)O The most successful animal groups
exhibit cephalization.
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Review Game
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What type of symmetry?
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What type of symmetry?
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What type of symmetry?