Question

I am a marine living animal with spiny skin. My body is radially symmetrical………………………Which phylum do I belong to.

Answer 1

Spiny-skinned Invertebrates, Echinoderm, any of a variety of invertebrate marine animals belonging to the phylum Echinodermata, spiny covering or skin, characterized by a hard.

They are marine organisms living at the sea bottom. All the larval forms of these animals exhibit bilateral symmetry but the adults show radial symmetry

Answer 2

Thanks for the question!

It is definitely a very interesting question to solve and do some brainstorming.

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Phylum $\textbf{Echinodermata}$ are spiny skinned animals which are invertebrates and have mesodermal or a secondary layer of skin consisting of ossicles which contain calcium deposits containing calcium carbonate into the dermis level.

They are marine animals which articulate spines and pincer-like or fine needle-like pedicellariae. The spines are protective in function and gives the organism a slight protection from predatory animals which desire to have them as a prey.

The symmetry present in the larvae are bilaterally symmetrical or the ones which can be distinguished clearly through dissections from the tip till the end of the body. However, the pentanumerous radial symmetry are occurring in the adult forms or later stages, that is, they contain the body parts that are arranged into the number of fives or multiple of fives that can be perfectly cut into five or parts (or more).

Echinodermata derives from the terms taken from Greek philosophy and languages, echinos here means "spines" and dermata (as most dermatologists use to define a skin expert) means "skin" or "covering".

Echinoderms or the Phylum Echinodermata, the name was introduced and given by
$\texbf{Jacob Klein}$ in the 17th century (1738 to be specific). There a total of 7000 species thought to be loving and recorded, as, a characterisation of Phylum Echinodermata.

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Hope it helps and solves your query!!