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Invertebrates Part 1

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by

Robert Williford

on 21 April 2015

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Transcript of Invertebrates Part 1

Simple Invertebrates
Invertebrates
Head and Guts
Bilateral Symmetry
- a body with two similar halves.
Radial Symmetry
- body parts arranged in a circle around a central point.
asymmetrical
- no symmetry(sponges)
Body Plans
Sponges are the simplest animals. They all live in water, have no brain or gut and have no organization to their shape. Because of this simplicity they can regenerate body parts or reproduce from cuttings.
Porifera
Cnidarians
The simplest group of worms. First invertebrates to be bilateral and have senses.
Nematoda
Platyhelminthes
Includes snails, slugs, clams, oysters, squids and octopuses. They all have a coelum and a circulatory system as well as a more complex circulatory system.
Mollusca
Mollusk anatomy
Often called segmented worms.

Segments
are identical repeating body parts. This group includes earthworms, bristle worms, and leeches.

Annelida
In this section we will discuss simple invertebrates, how they are organized, and their basic anatomy.
Invertebrates
- animals with no backbones. They make up 97% of all animal species and scientist believe we haven't even discovered the majority of them yet. They include insects, arachnids, worms, mollusks, sponges, cnidarians, crustaceans, and echinoderms.
All animals, except sponges, have nerves. In some invertebrates bunches of nerves come together in groups called
ganglia
. This is the most primitive form of a brain because it can control different body parts.
All cnidarians have stinging cells which is what they are named after. They have complex systems, a gut for digesting, and a nervous system.
Also known as nematodes, are tiny parasites that have a basic nervous system consisting of a ganglia for a brain and nerves that run the length of the worm. Examples include: pinworms and hookworms.
Open circulatory system
- a heart pumps blood into open sinuses or chambers.

This is what mollusks have.
Head
Guts
Gut
- a pouch lined with cells that release enzymes to break down food. All animals have a gut. Complex animals have a special space in the body, called a
coelom
, to contain the gut and allow the gut to expand and contract without interference from other body parts.
Two forms - Medusa and polyp
Feeding:
Planarians:
Flukes and Tapeworms:
Closed circulatory system
- a heart pumps blood through a network of blood vessels that form a closed loop. This is what we have.
Foot: used to move
Visceral mass: contains gills, gut and other organs.
Shell and mantle provide protection to organs.
Ctenophores
Consists of comb jellies that are named for the comb like rows of cilia that allow them to move through marine environments.
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