Question

name the various Phyla of invertebrates and write two distinguishing features and two example of each phylum​

Answer 1

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Classification of Invertebrates

There are over 30 phyla dedicated to invertebrates. All but one of the animal phyla are exclusively invertebrates. The phylum Chordata is divided into three subphyla, two of which are made up of invertebrates. The third subphylum, Vertebrata, includes the vertebrate animals. In addition, there are a great many invertebrate species that are extinct. Evidence of their existence is found only in the fossil record. The major exclusively invertebrate phyla that are still in existence today are the following:

Phylum (includes) Notable Characteristics Example

Porifera (sponges) multicellularity, specialized cells but no tissues, asymmetry, incomplete digestive system sponges

Cnidaria (jellyfish, corals) radial symmetry, true tissues, incomplete digestive system jellyfish

Platyhelminthes (flatworms, tapeworms, flukes) cephalization, bilateral symmetry, mesoderm, complete digestive system flatworm

Nematoda (roundworms) pseudocoelom, complete digestive system roundworm

Mollusca (snails, clams, squids) true coelom, organ systems, some with primitive brain snail

Annelida (earthworms, leeches, marine worms) segmented body, primitive brain earthworm

Arthropoda (insects, spiders, crustaceans, centipedes) segmented body, jointed appendages, exoskeleton, brain insect (dragonfly)

Echinodermata (sea stars, sea urchins, sand dollars, sea cucumbers) complete digestive system, coelom, spiny internal

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Answer 2

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Classification of Invertebrates

There are over 30 phyla dedicated to invertebrates. All but one of the animal phyla are exclusively invertebrates. The phylum Chordata is divided into three subphyla, two of which are made up of invertebrates. The third subphylum, Vertebrata, includes the vertebrate animals. In addition, there are a great many invertebrate species that are extinct. Evidence of their existence is found only in the fossil record. The major exclusively invertebrate phyla that are still in existence today are the following:

Phylum (includes) Notable Characteristics Example

Porifera (sponges) multicellularity, specialized cells but no tissues, asymmetry, incomplete digestive system sponges

Cnidaria (jellyfish, corals) radial symmetry, true tissues, incomplete digestive system jellyfish

Platyhelminthes (flatworms, tapeworms, flukes) cephalization, bilateral symmetry, mesoderm, complete digestive system flatworm

Nematoda (roundworms) pseudocoelom, complete digestive system roundworm

Mollusca (snails, clams, squids) true coelom, organ systems, some with primitive brain snail

Annelida (earthworms, leeches, marine worms) segmented body, primitive brain earthworm

Arthropoda (insects, spiders, crustaceans, centipedes) segmented body, jointed appendages, exoskeleton, brain insect (dragonfly)

Echinodermata (sea stars, sea urchins, sand dollars, sea cucumbers) complete digestive system, coelom, spiny internal