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4.4. Characters distinguishing between Penaeid and Non-penaeid prawns
4.4. Important characters distinguishing between Penaeid and Non-penaeid prawns
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Non- Penaeid prawns |
Penaeid prawns |
1.
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Pleura on either side of the exoskeleton of the second abdominal segment overlap the pleura of the first and third segments |
Pleura on either side of the exoskeleton of the second abdominal segment overlap only the third segment |
2.
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Only the first two thoracic legs are chelate |
The first three thoracic legs are chelate |
3.
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Such organs for transferring and storing are not present |
Male possesses “Petasma” for transferring sperm and female possesses “thelycum” for storing the sperm |
4.
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Females carry eggs between their pleopods as a cluster |
Females lay eggs individually in water |
Most male shrimps possess an appendix masculina, a lappet borne on the endopod of the second pair of pleopods, the presence or absence of which enables us to distinguish male from female; among non-penaeid parwns such a structure is also present on the third through the fifth pleopods of both sexes.