Question

write a descriptive note on the derivation of name of phylum 1.cnidarians 2.Annelida 3.Arthropoda
4.Mollusca 5.Echinodermata

Answer 1

CNIDARIANS

is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments: they are predominantly marine. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey.

Rank: Phylum

Lower classifications: Sea anemones and corals

ANNELIDS 

 are bilaterally symmetrical, triploblastic, coelomate, invertebrate organisms. They also have parapodia for locomotion. ... The basic annelid form consists of multiple segments. Each segment has the same sets of organs and, in most polychates, has a pair of parapodia that many species use for locomotion.

ARTHROPODS

 (Greek language for "joint-legged") are a large group of invertebrate animals. Insects, spiders, crabs, shrimp, millipedes, and centipedes are all arthropods. ... Arthropods have segmented body, an exoskeleton and legs with joints. Most arthropods live on land, but some live in water.

MOLLUSCS (or mollusks)

are an important phylum of invertebrate animals. Most of them are marine. They have huge numbers in-shore, that is, in shallow wahe largest marine phylum, with about 85,000 living species, 23% of all named marine organisms. They also occur in freshwater and on land.

ECHINODERMATA

is originated from 2 greek words , echinos meaning hedgehog and derma means skin son it means organism having spines in their body. These are free living marine animals. They are triploblastic and have a coelomic cavity. They have water driven tube system for movement

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