Insect Legs: Specialized for Success"* pptx.

Insect Legs: Specialized for Success"* pptx.

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  Insect Leg
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  Agricultural Entomology (Sixth Deans’Committee Recommended Syllabus) Course No: ENTO: 121 Course Title: Fundamentals of Entomology By, Mr. Arshad K. Shaikh Assistant Professor Institute: Sharadchandraji Pawar Institute of Agricultural Sciences, Kharavate- Dahiwali, Tal. Chiplun, Dist. Ratnagiri. Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli [email protected]
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  3 Insect legs arepaired; hollow more or less cylindrical and jointed outgrowth of thoracic segments. They are the important locomotory organ. Structure: In almost all insects all the three thoracic segments viz., pro-, meso- and metathorax bear a pair of segmented legs. Each leg consists of five segments viz., coxa, trochanter, femur, tibia and tarsus.
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  5 Insect leg mainlyconsists of 5 parts viz. 1. Coxa: It is the functional basal segment and it is rigidly fixed to thorax. 2.Trochanter: It is very small and the second segment. It is articulated with coxa and fixed to femur. 3. Femur: It is the largest, strongest segment and is articulated with the tibia.. 4.Tibia: It is equal or more than the length of the femur, articulated with tarsus. 5.Tarsus: It is the largest segment of the leg and usually devided into sub segments tarsomeres. The number of tarsomeres vary from 1-5. The term pretarsus refers to the terminal segment of the tarsus and any other structures attached to it, including: 1. Ungues -- a pair of claws 2. Arolium -a lobe or adhesive pad between the claws 3. Empodium (Diptera) - a large
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  8 Types or modificationsLegs : 1. Ambulatorial (Ambulate - to walk; Walking leg): Ambulatory legs are used for walking. The structure is similar to cursorial (running) legs. Examples: Bugs (order Hemiptera), leaf beetles beetles (Order: Coleoptera).
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  9 2. Cursorial: (Cursorial= adapted for running : Running leg) e.g. All the three pairs of legs of cockroach. Legs are suited for running. Femur is not swollen. 3. Saltatorial: (Salatorial = Leaping : Jumping Leg) e.g. hind leg of grasshopper.
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  10 4. Scansorial: (Scansorial= Climbing; climbing or clinging leg) e.g. all the three pairs of legs of head louse. 5. Fossorial: (Forrorial = Digging; Burrowing leg) e.g. Fore legs of mole cricket.
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  11 6. Raptorial: (Raptorial= predatory ; Grasping leg) e.g. Forelegs of preying mantis. 7. Natatorial: (Natatorial = Pertaining to swimming; Swimming leg) e.g. hind legs of water bug and water beetle.
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  12 8. Sticking leg:e.g. all the three pairs of legs of house fly. 9. Basket like leg: e.g. Legs of dragonfly and damselfly.
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  13 10. Clasping leg:e.g. Forelegs of male water beetle. 11. Foragial leg / Corbiculate: (Forage = to collect food material) e.g. Legs of honey bee
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  14 12. Prolegs orFalse legs or Pseudolegs: e.g. abdominal legs of caterpillar.  There are two to five pairs of abdominal legs termed prolegs in caterpillar.  Prolegs are thick, fleshy and not segmented.  They are shed with last larval moult.  One pair of prolegs on the last abdominal segment are called anal prolegs or claspers.  The tip of proleg is called planta upon which are borne hooks or claws known as crochets which are useful in crawling or clinging to surface.
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