COURSE I – FIRST SEMESTER

PHYLUM ARTHROPODA

Animals with jointed legsCompound eyesChitinous exoskeleton

Prof. S D Rathod

Arthropods

Arthropoda is the largest group of the animal kingdom

Bilaterally symmetrical, triploblastic and metamerically segmented

Sexes are usually separate with sexual dimorphism

Metamorphosis

Jointed legs

Compound eye

Compound eye in details

Crustacean Larvae

Embryo NaupliusZoea

Phyllosoma

Mysis

Megalopa Alima

Zoea larva

Zooplankton

CyclopsCalanus

Daphnia

Krill

Zooplankton

Complete Metamorphosis

Incomplete metamorphosis

Class – Crustacea (animals with crusta)

They have five pairs of walking legs

Cephalothorax with crusta or carapace

Stalked compound eyes

antennules and antennae are present

Example - Spiny Lobster

Spiny Lobster

Several small crustaceans play role of planktons

Daphnia Cyclops Calanus

Krill

Zooplankton

Class – Insecta:

Body divisible into head, thorax and abdomen

Three pairs of thoracic walking legs

Only antennae are present

example is Beetle

Beetles

Class – Myriapoda

Body divisible into head and trunk Mostly terrestrial; They have many pairs of walking

legs. Each leg is seven jointed Head has a pair of antennae and

compound eyes Example - Centipede

Centipede

Millipede

Class – Arachnid

Animals with prosoma and opisthosoma

Four pairs of walking legs Respiration is by book lungs

Spider

Black widow spider

Tarantula spider

Largest spider

Scorpion

Scientists in the US have claimed that scorpion venom may help in the treatment of a wide range of cancers.

The Amazonian scorpion the most venomous of all the scorpions in the world and needs medical aid otherwise the person stung would sweat profusely and there would spasmodic movement of the body. In such an even an antidote is required.

Ticks Tick Facts

Ticks are blood-eating parasites that live and feed on mammals, birds and reptiles around the world. 

Mites Dust mites do not feed on blood but the dead skin cells and the in the dust.

Some live creating burrows in our skin causing scabies.