MANOJ KUMAR (SHELFORD)

Saturday, July 7, 2012

adaptations in insects


Adaptations in insescts.
1.       Cybister
a.       Habit: it feeds on small fishes. It is positively phototropic. It is an active swimmer.
b.      Habitat: aquatic, occurs in deep water.
c.       Role in ecosystem: it is a secondary consumer.
d.      Adaptations:
i.                     Strucrural adaptations: forewings modified into horny elytra, hind wints are membranous, folded beneath the elytra.
ii.                   Feeding adaptations: mouth parts consists of strong mandibles.
iii.                  Respiratory adaptations: antennae are hydrofuge structures and can hold air balls containing oxygen for respiration.
iv.                 Flight adaptations: wing muscles of both sides are not fused together below the scutellum, therefore it is an active flier.
2.       hydrophilus olivaceous:
a.       habit: predacious, carnivorous.
b.      Habitat: aquatic habitat. It lives near vegetation. It is shade loving.
c.       Role in ecosystem: it is secondary consumer.
d.      Adaptations:
i.                     Structural adaptation: forewings modified into horny elytra, hind wings membranous, folded beneath elytra, body stream linexd.
ii.                   Feeding adaptations: mouth parts mandibulate adapted for biting.
iii.                  Respiratory adaptations: ventral surface of the body is with a set of hydrofuge hairy structures. It can hold an air film for respiratory purpose. Antennae are above hudrofuge structures and can hold air balls near the spiracles.
iv.                 Swimming adaptations: it is an active swimmer. Appendages are fringed with hairs.
v.                   Adaptations for defence: it has a metasternal keel for defence.
3.       Laccotrephes maculatus:
a.       Habit: it is phytophagous, positively phototrophic.
b.      Habitat: aquatic; is a bottom dweller and liver in mud.
c.       Role in ecosystem: primary consumer.
d.      Adaptations:
i.                     Structural adaptations: fore wings are chitinized to form hemielytra.
ii.                   Feeding adaptation: first pair of legs are pre-hensile and adapted for catching food. Mouth parts of piercing and sucking type.
iii.                  Respiratory adaptation: respiratory tube consists of 2-spine like processes.
iv.                 Swimming adaptations: body is slender, appendages are fringed with hair.


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