ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

Animal Kingdom - Echinodermata

Updated on August 30, 2015

Animals of the Echinodermata Group

Click thumbnail to view full-size
Brittle StarSea CucumberPencil UrchinSand Dollar
Brittle Star
Brittle Star
Sea Cucumber
Sea Cucumber
Pencil Urchin
Pencil Urchin
Sand Dollar
Sand Dollar

Starfish, sea urchins, sand dollars, sea cucumbers, sea lily, etc. belong to the echinodermata group. About 6,000 species of this group of animals are known today. The skin of these animals is spiky. The spikes are made up of calcium carbonate. Their body structure is such that their head, tail and legs are not visible separately. Their body is circular in shape, from which their arms and other organs project out like spokes of a wheel. The blood circulation system in these animals is different form that of other animals. They have a water vascular system within their body. The nervous system and sensory organs are underdeveloped. They have small sacs called tube feet. These help them in movement, respiration, excretion and also in catching their food. These animals are unisexual.

Sea Urchin

Red Sea Urchin
Red Sea Urchin

Sea Urchins

The body of sea urchins is a shell of hard plates. Long thorns stretch out form their entire body. These animals have their mouth on the lower part of the body, while the anus is located at the opposite end. The jaws of the sea urchins are strong enough to chew the sea moss easily. They are gifted with regeneration capability. That is, if a part of their body is lost, it regrows on its own. People fear going closer to the hatpin urchin because of their 3 cm long, thin poisonous thorns. The pricks of these thorns on human body cause unbearable pain.

Starfish

Starfish
Starfish

Starfish

There are 1,600 known species of starfish. Looking like a five-arm star, these animals have a hard and rough body. They do not have a head. Their mouth is on the lower surface of their body, while the anus lies on the upper surface of the body. A round plate called madreporite exists on the upper surface of the body, through which water enters into the body. There are ossicles and spikes on the skin of a starfish. Each arm on the lower surface has a groove with tube feet. These help the starfish in its movement.

Starfish too is gifted with regenerative power. If it loses one of its arms, another grows again on its own at the sample place. It has the greatest ability of reproduction.

Comments

    0 of 8192 characters used
    Post Comment

    • vegaswriter profile image

      vegaswriter 

      6 years ago from Las Vegas

      Those are beautiful pictures. I didn't know there were so many types of starfish.

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, hubpages.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://hubpages.com/privacy-policy#gdpr

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)