Crustaceans and Echinoderms

Crustaceans

Clawed Lobsters

Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Crustacea
Class:	Malacostraca
Order:	Decapoda
Infraorder:	Astacidea
Family:	Nephropidae

(http://www.mediabistro.com/agencyspy/red-lobster-biz-goes-to-grey-ny_b7230)

Hermit Crab

Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Crustacea
Class:	Malacostraca
Order:	Decapoda

(http://www.naturephoto-cz.com/crab:coenobita-sp.-photo-3777.html)

Spider Crab

Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	Decapoda
Family:	Inachidae
Genus:	Macrocheira
Species:	M. kaempferi

(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTdHnGptBvnJKrTHUPuAWL-pp5k-yMiu_B3Zl21l0XS2XNEOm1CQngsYtePdz0Lw4WYqB4lCjugQM-a1AJ2R0FmFX27dAOnVWw7_GQLHFv2GI0lTSJ_JNAnKwYmElYopDXv48rW4NNQQ/s400/spider_crab.png)

• Their skeleton is on the outside which is known as their exoskeleton.
• They are bilateral symmetry, which means both sides are the same.
• Also crustaceans have segmented appendages (legs).

Echinoderms

Horned Starfish

(http://www.richard-seaman.com/Wallpaper/Nature/Underwater/Invertebrates/SeaStars/GhavutuStarFish.jpg)

Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Asteroidea
Order:	Valvatida
Family:	Oreasteridae
Genus:	Protoreaster
Species:	P. nodosus

Granulated Sea Star

(http://www.richard-seaman.com/Wallpaper/Nature/Underwater/Invertebrates/SeaStars/GhavutuStarFish.jpg)

Sea Cucumbers

Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Holothuroidea
Order:	Aspidochirotida
Family:	Holothuriidae
Genus:	Holothuria
Species:	Holothuria pardalis

(http://images.nationalgeographic.com/wpf/media-live/photos/000/065/cache/sea-cucumber_6533_600x450.jpg)

• They have endoskeleton which means that their skeleton is on the inside.
• Echinoderms have no body segments
• Also the have radial symmetry ( which means it has more than 2 lines of symmetry).

Video Link (:

http://www.snotr.com/video/4889