LOBSTER MORPHOLOGY:
Ø Cephalon/Head(6p)+ Thorax (8p) 14 appendages
Ø Abdomen -6 pairs of appendages
Ø Lobster has 20 appendages or somites.
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Ø Somite l-ophthalmic somite |
Ø Carries the eye, movable with the help of stalk. |
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Ø Semite 2 Antennular somite |
Ø Antennules |
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Ø Somite 3-Antennal somite |
Ø Antennae |
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Ø Somite 4-9 [Last a head somite + st 3 thorax somite |
Ø – mouth part Ø |
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Ø Somite 5 & 6 Maxillulae |
Ø (1” maxillae) 2 Maxillae (2nd maxillae |
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Ø Somite 7-1” |
Ø maxiliped |
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Ø Somite 8-2 |
Ø maxiliped Ø |
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Ø Somite 9-13 |
Ø maxiliped Ø |
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Ø Somite 10-14 [thoracic appendages from 4th to 8th pair |
Ø -5 pairs of pereopods (True legs) |
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Ø Somite 15-19-[1st 5 pairs of abdominal somite |
Ø 5 pairs of pleopods (swimmerets) |
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Ø Somite 20 [20 somite J |
Ø Tail fan consists of a pair of Uropod & unpaired telson |
Function
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ANTENNULE: |
Very short sensory organ with fine hairs-Olfactory function.
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ANTENNA |
-Long sensory organ having tactile function |
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CLAW- |
terminal end of 1st three pairs of legs-prehensile, defensive |
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CARAPACE |
Hard covering produced by folds of tissues from the back segments of the head; it protects the body of the Lobster.
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ABDOMEN |
Posterior portion of the body formed of 6 segments and bearing the pleopods; appendages used for swimming, circulating water over gills and holding the eggs |
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THORACIC LEGS |
Limbs attached to cephalothorax having a prehensile and motor function. The st 3 legs bear pincers while last 2 beaut daws. |
TELSON & UROPOD-Telson located at end of body while cropod has 2 lobes helps in swimming.
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