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https://www.britannica.com/animal/echinoderm
Echinoderm, any of a variety of invertebrate marine animals belonging to the phylum Echinodermata, characterized by a hard, spiny covering or skin. Beginning with the dawn of the Cambrian Period (542 million to 488 million years ago), echinoderms have a rich fossil history and are well represented
https://www.cliffsnotes.com/study-guides/biology/biology/animals-invertebrates/echinodermata
Echinoderms have the ability to reproduce by regeneration, a process in which a relatively small piece of the animal can regenerate an entire body. All echinoderms have an internal support system called an endoskeleton and a large body cavity containing a set of canals called a water vascular system.
https://en.wikipedia.org/wiki/Echinoderm
The epidermis consists of cells responsible for the support and maintenance of the skeleton, as well as pigment cells, mechanoreceptor cells (which detect motion on the animal's surface), and sometimes gland cells which secrete sticky fluids or even toxins. The varied and often vivid colours of echinoderms are produced by the action of skin pigment cells.Clade: Bilateria
https://www.digitalatlasofancientlife.org/learn/echinodermata/
Echinoderms have a true endoskeleton made up of ossicles, or tough plates of calcium carbonate that act as body support and protection. The dried-out skeleton is called a "test" or "theca". Holothuroideans (sea cucumbers) are made up of primarily collagenous tissue because their ossicles are microscopic in …
http://u.osu.edu/eeob3320/category/echinoderms/
Apr 20, 2015 · Water movement could impact the echinoderms by moving them or destroying their habitats. Depending on the species the water depth and movement will vary. Echinoderms are generally found in shallow water near shores or in reef environments but …
https://www.onlinebiologynotes.com/phylum-echinodermata-general-characteristics-classification/
Jun 11, 2017 · Body is star shaped; Some of the forms were extinct and living forms. Arms bifurcated, with two pinnules. They have tube feet without suckers; Examples: Neometra, Antedon, Rhizocrinus, etc Phylum Echinodermata: General Characteristics and Classification
http://www.mesa.edu.au/echinoderms/
Echinoderms have a network of fluid-filled canals that function in gas exchange, feeding and in movement. The network contains a central ring and areas which contain the tube feet which stretch along the body or arms. The tube feet poke through holes in …
https://www.thoughtco.com/echinoderm-phylum-profile-2291838
Instead of blood, echinoderms have a water vascular system, which is used for movement and predation. The echinoderm pumps sea water into its body through a sieve plate or madreporite, and this water fills the echinoderm's tube feet.
https://quizlet.com/135853179/echinodermata-flash-cards/
fluid filled system that carries out many essential body functions in echinoderms including respiration, circulation, and movement
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