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Example: Medusa

Stinging cells.

Two stages in life cycle (polyp & medusa)

Blind sack gut.

Radial symmetry.

Diploblastic.

Hydrostatic skeleton.

Nerve net.

Many colonial, some solitary forms.

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Examples:  Crabs

Stinging cells.

Two stages in life cycle (polyp & medusa)

Blind sack gut.

Radial symmetry.

Diploblastic.

Hydrostatic skeleton.

Nerve net.

Many colonial, some solitary forms.

A hard exoskeleton made of calcium - no internal skeleton.

The head has two compound eyes, two pairs of antennae, and three pairs of mouthparts.

A pair of green glands excrete wastes near the base of antennae.

The abdominal segments have swimmerets (swimming legs)

The sexes are separate. Eggs are attached to the swimmerets (swimming legs) of the female. The first pair is enlarged in the male (it is used to pass sperm to the female).

The tail is fan-shaped, and ends in uropods and a telson.

The circulatory system is open; there is no heart and the "blood" is pumped by vessels into sinuses, and does not flow in a closed loop).

The nervous system consists of a primitive ventral nerve cord and ganglia system

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Poriferans are commonly called sponges.

These are multicellular organisms which are sessile/sedentary in nature.

Most of them are marine while a few are fresh water forms.

Body is cylindrical, asymmetrical or has radial symmetry.

Body wall is diploblastic which consists of an outer layer called pinacoderm and an inner layer called choanoderm.

The middle layer is called mesenchyme which has various kinds of wandering amoebocytes.

Body wall contains numerous pores called ostia through which water enters in the body through a canal system into the central body cavity, called spongocoel.

The canal syytem mainky comprise of incurrent and excurrent canals which are lined with pinacocytes; and radial canals which are lined with choanocytes (flagellated cells).

Body also contains one or more openings called oscula (-um/singular) through which water passes out from the body.

Sponges feed on minute organisms and small organic particles which enter the body through water current and are ingested by the choanocytes.

Respiration takes place by diffusion of oxygen from water the flowing into the body.

Sponges have an exoskeleton which is made up of either spongin fibers or calcareous/siliceous spicules or a combination of both.

Excretory product, mainly ammonia, is released from the body through outgoing water current.

Reproduction may be asexual or sexual.

Asexual reproduction takes place by external or internal budding (formation of gemmules) or by disintegration of body into reduction bodies.

Sexual reproduction involves internal fertilization. Male gametes enter the sponge body through water current and fertilize with ovum with the help of choanocytes.

The larval stage of calcaroeus sponges is amphibalstula while that of demospongiae is rhagon larva.

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They can live in damp soil or marine. The body of molluscs is un-segmented with a distinct head, muscular foot and visceral hump. Neopilina is a segmented mollusc.They usually show bilateral symmetry. In some molluscs like Pila, due to torsion (twisting) during growth, the adults become asymmetrical.
Single layered epidermis is usually ciliated. Muscles are un-striped and occur in bundles.

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These are exclusively marine animals.

The larval forms show bilateral symmetry and adult forms show radial symmetry.

They are triploblastic.

It exhibits organ system grade of organisation.

They have a true coelom.

The body is uniquely shaped. It can star like, elongated or spherical.

The body is unsegmented without a head.

The body surface is covered with calcareous spicules.

Body cavity has the distinguishing water vascular system.

Tube feet help in locomotion.

The brain is absent but a nervous system is present with a nerve ring and radial nerve cords.

Respiration occurs through tube feet and gills.

Sense organs are poorly developed and include tactile organs, chemoreceptors, terminal tentacles etc.

Sexes are separate.

Fertilisation is external.

Lost parts can be regenerated.

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They’re normally long and skinny  they are also microscopic and some characteristics are:

Primitive Body Cavity. Roundworms are classified as pseudocoeloms, because they do not have a full-fledged body cavity. ...

Shape and Body Structure. Nematodes are often confused with flatworms because of similarities in physical appearance. ...

Simple Digestive System. ...

Protective Cuticle. ...

Parasitism & Crytobiosis.

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The phylum includes jellyfish, sea anemone and coral. Characterized by a digestive cavity that forms the main body, they may have been the first animal group to reach the tissue level of organization. Cnidarians are radially symmetrical, jelly-like and have a nerve net and one body opening.

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Class insecta encompasses all insects, and is included in phylum arthropoda. Insects have three main body segments: the head, thorax and abdomen. They have six legs, one or two pairs of wings and specialized mouth parts.

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All arthropods share a common set of characteristics that include having jointed limbs, an exoskeleton, good senses, and bilateral body symmetry. An exoskeleton is a hard, shell-like covering that protects an arthropod's inside body parts.