Question

Which one of the following combination are the characteristic features of crustaceans ?

• A. Head and thorax, book gills and appendages
• B. Cephalothorax, book gills and appendages
• C. Head and thorax, gills and appendages
• D. Cephatothorax, gills and appendages

Answer 1

The correct option is A Head and thorax, book gills and appendages

Crustaceans belong to subphylum Crustacea, phylum Arthropoda, and kingdom Animalia. They have following characteristic features :

1 ) Hard exoskeleton made up of calcium and no internal skeleton

2) They have head, thorax, and abdomen when head and thorax are united it is called as the cephalothorax . Head has five segments.

3) Have open circulatory system

4 ) Have book lungs or book gills

5) Have appendages for locomotion and is biamous.

Hence answer is A.