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https://courses.lumenlearning.com/wm-biology2/chapter/phylum-mollusca/

https://www.britannica.com/animal/echinoderm

https://animals.net/arthropod/

https://cooljargon.com/ebooks/biology/m44681/index.cnxml.html

http://www.opentextbooks.org.hk/ditatopic/35133

https://molluscs.weebly.com/habitat.html

https://www.newportaquarium.com/Things-To-Do/Animals/Echinoderms

https://www.ck12.org/book/ck-12-biology-advanced-concepts/section/15.29/
https://animaldiversity.org/accounts/Octopus/classification/
https://ssec.si.edu/stemvisions-blog/all-about-starfish

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Mostly predators and feed on invertebrates such as mussels and clams that live on the ocean floor

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Prefer fresh food but will eat dead animals too

shrimp, amphipods (also known as “sand fleas”) and even small fish

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Octopus vulgaris eat active predators that feed primarily on gastropods and bivalves.

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Can be found in all ocean basins of the world and at a large assortment of depths and bottom composition.

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The Northwest Atlantic, from Labrador to North Carolina, on the ocean floor. Specifically in rocky areas where they can hide in the crevices from predators.

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Octopus vulgaris is found in tropical, subtropical, and temperate waters between the surface and a depth of 100 to 150 meters.

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Kingdom- Animalia
Phylum- Echinodermata
Class- Asteroidea
Order- Brisingida, Forcipulatida, Paxillosida, Notomyotida, Spinulosida, Valvatida, Velatid
Family- Asteridae
Genus- Pisaster
Species- Asterias Rubens

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Lobster- Classification

Kingdom-  Anamilia
Phylum- Arthropoda
Class- Crustacea
Order- Decapoda
Family- Nephropidae
Genus- Homarus
Species- americanus

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Kingdom — Animalia

Phylum — Mollusca

Class — Cephalopoda

Order — Octopoda

Family — Octopodidae

Genus — Octopus

Species — Octopus vulgaris

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The molluscs do not have segmented bodies, but the echinoderms and arthropods do.

The echinoderms have an internal skeleton or endoskeleton, the molluscs and arthropods have an external skeleton

Molluscs can have either external or internal fertilization, while the terrestrial arthropods have internal fertilization and the marine arthropods and echinoderms have external fertilization

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All are marine organisms

Molluscs and arthropods have an external skeleton

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Flattened body

Marine animals

Organ level organization

Tube feet

Bilateral symmetry

Have a skeleton made of calcium carbonate

Have external fertilization

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Have an external skeleton made of chitin

Have a segmented body

Has a nervous system

Jointed foot

Terrestrial arthropods have internal fertilization

3/4 of all animals are arthropods.

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unsegmented, bilaterally symmetrical body covered by a shell

Body has a cavity

Muscular foot used for movement

Radula feeding structure

Soft-bodied

As many as 200,000 species