Major Phylums in kingdom Animalia

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Very simple and small soft-bodied animals with planula-like features.

common examples include; Ragworms, earthworms and leeches.

includes crustaceans, insects and arachnids.

Unlike bivalve molluscs this group has hard shells on the upper and lower surfaces.

Small aquatic invertebrates which live in sedentary colonies.

predatory marine worms which are a major component of plankton worldwide.

Animals with back-bones & tunicates & lancelets

jellyfish and anemones belong to this group

tiny aquatic animals found living on the mouthparts of cold-water lobsters.

tiny parasites which live in the renal appendages of cephalopods.

Starfish, sea urchins and sand dollars belong to this group.

mostly sessile aquatic animals. mature individuals are goblet-shaped on relatively long stalks and have a crown of solid tentacles.

worm-like microscopic organisms. typically live within the detritus on the seabed and other water bodies.

First recognized in 1956 these nearly microscopic animals can survive in relatively anoxic environments. Often slender to thread-like worms.

acorn worms are an example of this group.

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Have small segmented, limbless bodies composed of a head, neck and trunk of eleven segments, unlike other small invertebrates they do not have external cilia but instead have a number of spines along the body for use in locomotion.

this group of microscopic sediment dwelling animals are characterized by a protective outer case called a lorica.

clams, snails and octopus all belong to this group

commonly parasitic worms, hookworms, pinworms and whipworms are all examples of this group.

similar to nematodes the adults are free-living but larvae are parasitic on athropods. They often coil themselves into tight balls that resemble knots.

Bootlace worms may be the longest animal on the planet at over 30 meters in length and belong to this group of worms.

These worm like creatures could easily be mistaken for caterpillars. They prey upon other invertebrates by ejecting an adhesive slime to trap them.

These small poorly known marine parasites are among the simplest of multicellular organisms. The adults are microscopic wormlike animals, consisting of a single layer of ciliated outer cells surrounding a mass of sex cells.

simplest in structure of all animals. Their name means "flat animals"

This group of worms are relatively simple bilateral, unsegmented soft-bodied invertebrates. they lack body cavities, ciculatory and respiratory organs which restricts them to having a flatted shape.

these simple animals anchor themselves on the seabed and feed by filtering water. They can be highly colorful.

the name of this phylum of marine unsegmented worms relates to the Greek god of fertility.

these microscopic & near-microscopic animals are found in freshwater environments around the world. Most are free swimming and make up an important part of freshwater zooplankton.

found everywhere in earths biosphere these creatures are best known for their ability to survive extreme conditions that would quickly kill most other forms of life.

these simple benthic worm like creatures have a simple sac-like gut but lack respiratory, circulatory and excretory systems.