Alisha Horst, Cecelia King, and Amber Plank. Referred to as segmented worms Found in deep marine...
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Transcript of Alisha Horst, Cecelia King, and Amber Plank. Referred to as segmented worms Found in deep marine...
![Page 1: 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:](https://reader036.fdocuments.in/reader036/viewer/2022062309/56649e9d5503460f94b9e014/html5/thumbnails/1.jpg)
Alisha Horst, Cecelia King, and Amber Plank
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• 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
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Have three body regions
Majority of the body is made of repeated sections called segments
Examples: earthworms, leeches
*activity – earthworm dissection
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Worm Dissection
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molluscus- Latin meaning soft
Soft bodied with an internal or external shell
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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)
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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
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ReproductionExternal fertilizationInternal fertilization (mollusks
with tentacles and some snails)Cross fertilization (snails that
are hermaphrodites)Mollusk Video Clips
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Mollusks
Examples: Squid, Giant Clams, Octopus
Vampire Squid
*activity – squid labeling paper
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Squid Labeling Key
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Groups of animals include:Starfish, urchins, feather stars and
sea cucumbers
Sand Dollar Video
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They are simple animals:They don’t have A brainComplex sensing
organsFront or back endHead
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They do have:Spiny skin5 part radial
symmetryInternal skeletonCentral mouthDevelop sharp
spines for protection
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They are found in a variety of shapes and colors.
They cling to coral reefs around the world
They live entirely in water
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What it does:Feeding, movement, internal
transport, respiration, and excretion
Some of these animals are carnivorous, and feed and scavenge the ocean floor
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All echinoderms move around with the use of thousands of tiny tube feet, many of which have suction cups on the ends
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The most unusual feature to echinoderms is their water vascular system. It contains a network of fluid-filled canals connected to countless tube feet.