Definitions for echinoidea
echi·noidea

Princeton's WordNetRate this definition:0.0 / 0 votes

1. Echinoidea, class Echinoideanoun

   sea urchins and sand dollars

WikipediaRate this definition:0.0 / 0 votes

1. Echinoidea

   Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to 5,000 meters (16,000 ft; 2,700 fathoms). The spherical, hard shells (tests) of sea urchins are round and covered in spines. Most urchin spines range in length from 3 to 10 cm (1 to 4 in), with outliers such as the black sea urchin possessing spines as long as 30 cm (12 in). Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. Although algae are the primary diet, sea urchins also eat slow-moving (sessile) animals. Predators that eat sea urchins include a wide variety of fish, starfish, crabs, marine mammals, and humans. Like all echinoderms, adult sea urchins have fivefold symmetry, but their pluteus larvae feature bilateral (mirror) symmetry, indicating that the sea urchin belongs to the Bilateria group of animal phyla, which also comprises the chordates and the arthropods, the annelids and the molluscs, and are found in every ocean and in every climate, from the tropics to the polar regions, and inhabit marine benthic (sea bed) habitats, from rocky shores to hadal zone depths. The fossil record of the Echinoids dates from the Ordovician period, some 450 million years ago. The closest echinoderm relatives of the sea urchin are the sea cucumbers (Holothuroidea), both of which are deuterostomes, a clade that includes the chordates. (Sand dollars are a separate order in the sea urchin class Echinoidea.) The animals have been studied since the 19th century as model organisms in developmental biology, as their embryos were easy to observe. That has continued with studies of their genomes because of their unusual fivefold symmetry and relationship to chordates. Species such as the slate pencil urchin are popular in aquariums, where they are useful for controlling algae. Fossil urchins have been used as protective amulets.

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1. echinoidea

   Echinoidea is a class within the phylum Echinodermata, which includes marine animals such as sea urchins and sand dollars. They are characterized by their spherical or flattened bodies, movable spines, and five-fold radial symmetry. Echinoidea usually have a hard, calcified shell and play important roles in marine ecosystems, often contributing to bioerosion.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Echinoidea

   the class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid

2. Etymology: [NL. See Echinus, and -oid.]

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Numerology

1. Chaldean Numerology

   The numerical value of echinoidea in Chaldean Numerology is: 1

2. Pythagorean Numerology

   The numerical value of echinoidea in Pythagorean Numerology is: 1

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=echinoidea
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Echinoidea
3. ^ ChatGPT
   https://chat.openai.com
4. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/echinoidea