Find the odd one out with respect to the members of Phylum Echinodermata A. Sea walnuts B. Sea cucumber C. Sea Lily D. Sea urchin
Option A.Classification of every option -Sea cucumber :- Scientific name is holothuroidea These are marine animals with leathery skin and they have long body and branched gonads. They have an endoskeleton just below the skin. Kingdom – Animalia Phylum- Echinodermata -Sea urchin:- Scientific name is echinoidea They are water animals having spines and globular animals are round having hard shells outside which consist of spines. They are closely related sea cucumbers. Kingdom – Animalia Phylum – Echinodermata -Sea lily:- Scientific name is crinoidea They are marine animals characterized by having mouths located on the upper surface Surrounded by feeding arms and linked by a U shaped gut. Kingdom – Animalia Phylum – Echinodermata -Sea fan:- Scientific name is Alcyonacea which is a soft coral and does not have a hard Endoskeleton. They are fan-like bushy erect branches like in the Deep Ocean all Over the world. Their internal skeleton consists of a flexible horny scleroprotein Called gorgonian The polyps spread their tentacles to form a catching net. Kingdom- Animalia Phylum- cnidaria Hence the Echinodermata do not form nets with any kind of tentacles and make colonies like sea fans rather than individual structures.
