Structure and modification of Antennae.pptx

The antennae are often called 'feelers' because the insect waves them around. This is a wrong name because they are not only used for touch. The antennae are actually the insects 'nose' - they are used for the sense of smell.

1. Department of Entomology College of Agriculture, Indore- 452001 (M.P.) Rajmata Vijayaraje Scindia Krishi Vishwavidyalaya Prepared by Dr. Neelesh Raypuriya Topic: Insect Antennae

2. Introduction Antennae are located between or behind the compound eyes. All insects except protura have a pair of antennae. Antennae are well developed in adults and poorly developed in immature stages. Antennae are also called feelers. They are paired, highly mobile and segmented.

3. 1. e.g. Leafhopper, Dragonfly, Damselfly . Setaceous: (Bristle like) size of the segments decreases from base to apex. Types of Antennae

4. e.g. Grasshopper. 2. Filiform: (Thread like) Segments are usually cylindrical. Thickness of segments remains same throughout . Contd…

5. e.g. Termite. 3. Moniliform: (Beaded) Segments are either globular or spherical with prominent constriction in between. Contd…

6. Contd… e.g. Longicorn bettle 4. Serrate: (Saw like) Segments have short triangular projections on one side.

7. Contd… e.g. Sawfly, fireflies and beetle 5.Pectinate: (Comb like) Segments with long slender processes on one side

8. Contd… 6. Bipectinate: (Double comb like) Segments with long slender lateral processes on both the sides e.g. Silkworm moth

9. Contd… e.g. Blister beetle 7. Clavate: (Clubbed) Antenna enlarges gradually towards the tip.

10. e.g. butterfly 8. Capitate: (Knobbed) Terminal segments become enlarged suddenly Contd…

11. 9. Lamellate: (Plate like) Antennal tip is expanded laterally on one side to form flat plates e.g. lamellicorn beetle Contd…

12. e.g. Housefly 10. Aristate: The terminal segment is enlarged. It bears a conspicuous dorsal bristle called arista. Contd…

13. 12. Plumose: (Feathery) Segments with long whorls of hairs e.g. male mosquito Contd…

14. 13. Pilose: (Hairy) Antenna is less feathery with few hairs at the junction of flagellomeres. e.g. Female mosquito. Contd…

15. 14. Geniculate: (Elbowed) Scape is long remaining segments are small and are arranged at an angle to the first resembling an elbow joint. e.g. Ant, weevil and honey bee. Contd…

16. It perceives smell, humidity changes, variation in It is useful for hearing in mosquitoes and Function: Antenna is useful to detect chemicals including food and pheromones (chemicals secreted into air by opposite sex). temperature, vibration, wind velocity and direction. Antenna is useful to perceive the forward environment and detect danger. communication in ants. Rarely it is also useful to clasp the mate (e.g. Flea) and grasp the prey. Contd…

17. You Thank