CLASSIFICATION OF PENAEUS (PRAWN)
KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)
PHYLUM :- ARTHROPODA (Jointed appendages.)
SUB-PHYLUM:- CRUSTACEA (Exoskeleton thick, antennae 2 pairs, jaws 3 pairs.)
CLASS :- MALACOSTRACA (6 abdominal segments having body distinctly segmented.)
ORDER :- DECAPODA (Carapace present.)
FAMILY :- PENAEIDAE (Abdomen well developed and hard.)
GENUS :- Penaeus (Prawn)
It is found in American water. Most species are only found in a region between 40° north and 40° south. Some species may occur at higher latitudes.
HABIT AND HABITAT
Penaeus is a marine and deep sea form, chiefly inhabiting tropics.
GENERAL CHARACTERSTICS OF PENAEUS (PRAWN)
- It is commonly called as prawn.
- The preserved specimen is orange-pink in colour having thin integument.
- Body is divided into an anterior rigid cephalothorax, posterior flexible abdomen and a post segmental terminal telson. All these divisions contain appendages.
- Cephalothorax is formed of 6 cephalic and 8 thoracic segments. Head contains 2 prominent eyes, very long antennae and short antennules.
- Endopodite of the first maxillula is elongated and segmented.
- Walking legs are attached to thorax and first three pairs of legs are chelate. Each leg bears the exopodite and endopodite.
- Abdomen consists of 6 segments and contains swimmerets of biramous swimming pleopods. They lack finger-like processes called appendix intemae on their exopodites. Abdomen is laterally compressed but not bent sharply. Pleopods are biramous and devoid of appendix intemae.
- Pleura of the second abdominal segment do not overlap those of the first.
- Development includes nauplius, protozoaea and zoaea stages.
The animal contains cephalothorax, and leaf like uropods, flexed abdomen and all above features, hence it is Penaeus