Question

Explain the general characters of phylum Arthropoda. Give one example of following classes
​(i) Crustacea; (ii) Myriapoda; (iii) Insecta; (iv) Arachnida.

Answer 1

The general characteristics of phylum Arthropoda are as follows:
1. The animals of this phylum show bilateral symmetry, triploblastic origin and metameric segmentation.
2. The body segments are generally classified into two (cephalothorax and abdomen) or three (head, thorax and abdomen) regions.
3. Sexual dimorphism is observed in most of the organisms.

(i) Daphnia (water flea) belongs to the class Crustacea.

(ii) Julus (millipede) is an organism that belongs to the class Myriapoda.

(iii) Melanopus (grasshopper) has been classified under the class Insecta.

(iv) Sarcoptes (itch-mites) belong to the class Arachnida.