alisha horst, cecelia king, and amber plank. referred to as segmented worms found in deep marine...
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Alisha Horst, Cecelia King, and Amber Plank
• Referred to as segmented worms
• Found in deep marine sediments as well as common soils
• Split into three groups: polychaeta, oligochaeta (earthworms), and hirudinea (leeches)
• Polychaeta (live in almost all marine environments) is the bulk of the annelid group but the other two groups are most familiar for humans
Have three body regions
Majority of the body is made of repeated sections called segments
Examples: earthworms, leeches
*activity – earthworm dissection
Worm Dissection
molluscus- Latin meaning soft
Soft bodied with an internal or external shell
Four body partsShell- made of calcium carbonate (CaCO3)
secreted by glands in the mantleMantle- thin tissue covering body. Secretes
the shellMuscular foot- mouth and other feeding
partsVisceral mass- internal organs located here
Bilaterally symmetrical
Have 1 or 2 shells
Produce a trochophore (larva)
RespirationAquatic mollusks: gillsLand mollusks: mantle cavity lined
with blood vessels, “skin breathing”
Internal TransportSessile and slow moving mollusks:
open circulatory system- blood flows into internal body cavities
Fast moving mollusks: closed circulatory system
ReproductionExternal fertilizationInternal fertilization (mollusks
with tentacles and some snails)Cross fertilization (snails that
are hermaphrodites)Mollusk Video Clips
Mollusks
Examples: Squid, Giant Clams, Octopus
Vampire Squid
*activity – squid labeling paper
Squid Labeling Key
Groups of animals include:Starfish, urchins, feather stars and
sea cucumbers
Sand Dollar Video
They are simple animals:They don’t have A brainComplex sensing
organsFront or back endHead
They do have:Spiny skin5 part radial
symmetryInternal skeletonCentral mouthDevelop sharp
spines for protection
They are found in a variety of shapes and colors.
They cling to coral reefs around the world
They live entirely in water
What it does:Feeding, movement, internal
transport, respiration, and excretion
Some of these animals are carnivorous, and feed and scavenge the ocean floor
All echinoderms move around with the use of thousands of tiny tube feet, many of which have suction cups on the ends
The most unusual feature to echinoderms is their water vascular system. It contains a network of fluid-filled canals connected to countless tube feet.