1. Tardigrade
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  3. Biology
  4. Select the distinguishable characters of Ophiura from Balanoglossus.

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Q. Select the distinguishable characters of Ophiura from Balanoglossus.

NTA AbhyasNTA Abhyas 2022

Solution:

Echinodermata are triploblastic and coelomate animals, characterised by the presence of endoskeleton made up of calcareous ossicles, water vascular system, radial symmetry e.g., Asterias (starfish), Echinus (sea urchin), Antedon (sea lily), Cucumaria (sea cucumber) and Ophiura (brittle star).
Hemichordates are a small group of worm-like marine animals with the organ-system level of organisation. They are bilaterally symmetrical, triploblastic, and coelomate animals. The body is cylindrical and is composed of an anterior proboscis, a collar, and a long trunk e.g., Balanoglossus and Saccoglossus.