A) Cephalothorax, gills and appendages
B) Head and thorax, gills and appendages
C) Cephalothorax, book gills and appendages
D) Head and thorax, book gills and appendages
Correct Answer: A
Solution :
Class Crustacea belongs to sub-phylum Mandibulata of phylum Arthropoda. In crustaceans, the head often joined with thorax to form cephalothorax. The head is 5-segmented and appendages are typically biramous. The respiration takes place by gills or body surface. Cephalothorax, appendages and book gills are found in class Merostomata of sub-phylum Chelicerata.
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