The general characteristics of phylum arthropod are as
follows :
1. Habitat: It is the largest phyllum. arthropod are
found in all the habitat. They are parasitic too.
2. Body form: They are multicellular organism with
organ grade of body organization. They are bilaterally symmetrical. They are
triploblastic.
3. Their body consists of jointed appendages or legs. Body is
divided into head, thorax and abdomen. In some case , head and thorax are
fused to form cephalothorax as in prawn.
4. Coelom : they are haemocoeloamate animal.
5. Respiration : They respire by gills or trachea or book lungs.
6. Excretion : The organs for this is Malpighian tubules
(terrestrial form) , green gland (aquatic from ) , and coxal gland ( arachnid).
7. Sensory organ : Their sensory organ are compound eyes ,
antennae , statocysts.
The classification
of phylum arthropod are as follows :
The
classification of of phylum arthropod are as follows :
Crustacea
1. It has 5 pair
of legs for walking.
2. Their head consists of 2 pair of antaneea.
3. Their body is
divided into abdomen and thorax.
4. Crustacea respire through gills.
eg : Cancer ( Crab
) , Prawn (Palaemon) , Daphnia etc
Myriapoda
2. Their head consists of 1 pair of antaneea.
3. Their body is
divided into head and many segmented trunks.
4. They respire
through trachea.
eg : Centipede
(Scolopendra) , Milipede (Julus)
Insecta
1. It has three
pair of legs for walking.
2. Their head
consists of 1 pair of antaneea.
3. Their body is
divided into head, abdomen and thorax.
4. They respire
through trachea.
eg : Cockroach
(Periplaneta americana) , Butterfly (Melanopus) etc
Arachnida
1. It has four
pair of legs for walking.
2. Their head do
not consist of antaenna.
3. Their body is
divided into perosoma, mesosoma, metasoma.
4. They respire
through trachea and book lungs.
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