Kingdoms

Animal kingdom

Invertebrates(No back bone)

Molluscs (-fleshy pad for movement)



Molluscs have such a varied range of body structures that it is difficult to find defining characteristics that apply to all modern groups. Mollusc is snail ,but they don't have their shells.

Echinoderms(- bodies in five parts, spiny outer covering)



Echinoderms (Phylum Echinodermata) are a phylum of marine animals.

Arthropods -jointed legs -bodies in sections -thick, hard exoskeleton

An **arthropod** is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and jointed appendages.

-Crustaceans -5-7 pairs of legs -chalky shell



**Crustaceans** (**Crustacea**) are a very large group of arthropods, comprising almost 52,000 described species, and are usually treated as a subphylum. They include various familiar animals, such as crabs, lobsters, crayfish, shrimp, krill and barnacles. The majority of them are aquatic, living in either marine or fresh water environments,

-Insects -3 pairs of legs (head, body, abdomen) -body in 3 sections

 

**Insects** are a class of arthropods that have a hard exoskeleton, a three-part body (head, thorax, and abdomen), three pairs of jointed legs, compound eyes.

Arachinds- 4 pairs of legs -body in 2 sections



**Arachnids** are a class (**Arachnida**) of joint-legged invertebrate animals in the subphylum Chelicerata. All **arachnids** have eight legs.

Centipedes and Millipedes -Many pairs or legs -Many body sections



sponges



**Sponges** are animals of the phylum **Porifera**. Their bodies consist of jelly-like mesohyl sandwiched between two thin layers of cells. While all animals have unspecialized cells that can transform into specialized cells, sponges are unique in having some specialized cells that can transform into other types.

Cnidarians



**Cnidarian** is a phylum containing over 9,000 species of animals found exclusively in aquatic, mostly marine, environments. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick.