OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sea turtles, whales, sea stars and slamon
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Sea urchins, octopus, clownish and sea horses
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Fishes, sponge, sharks, and clams
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Brittle stars, sea stars, sea cucumbers, sea urchins and sandollors
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Detailed explanation-1: -Sea star or starfish (Asteroidea) Brittle stars, basket stars, serpent stars (Ophiuroidea) Sea urchins, heart urchins and sanddollars (Echinoidea) Holothurians or sea cucumbers (Holothuroidea) Feather stars and sea lilies (Crinoidea). 10-Feb-2019
Detailed explanation-2: -The phylum echinoderms is divided into five extant classes: Asteroidea (sea stars), Ophiuroidea (brittle stars), Echinoidea (sea urchins and sand dollars), Crinoidea (sea lilies or feather stars), and Holothuroidea (sea cucumbers).
Detailed explanation-3: -Examples of echinoderms include sea stars, sea urchins, sea cucumbers, brittle stars, and feather stars (Fig. 3.83). Although they may appear very different, echinoderms all have two major defining characteristics that set them apart from all other animals: a water vascular system and five-sided radial symmetry.
Detailed explanation-4: -Echinodermata is a phylum of about 7000 living species distributed among five classes: Echinoidea (sea urchins and sand dollars), Holothuroidea (sea cucumbers), Ophiuroidea (brittle stars), Asteroidea (sea stars), and Crinoidea (feather stars and sea lilies).
Detailed explanation-5: -Brittle Stars are part of the benthic (bottom feeding) fauna found in the marine environment. They are broadly referred to as Echinoderms, classified in the Phylum Echinodermata which are marine animals having radial symmetry with five parts, often with spines.