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Insect development and life cycle

Insect development and life cycle. INSECTS LARVAE. CAMPODEIFORM elongated, flattened, active Weel developed legs & antennae Many beetles & Neuroptera (lace- wing). CARABIFORM (pg 29) flattened, well-developed legs Carabidae (beetle) short legs, short cerci and a flattened body.

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Insect development and life cycle

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  1. Insect development and life cycle

  2. INSECTS LARVAE • CAMPODEIFORM • elongated, flattened, active • Weel developed legs & antennae • Many beetles & Neuroptera (lace- wing)

  3. CARABIFORM (pg 29) • flattened, well-developed legs • Carabidae (beetle) • short legs, short cerci and a flattened body.

  4. SCARABAEIFORM • sluggish, cylindrical, c-shaped • well-developed head and thoracic legs • Scarabaeidae (beetle)

  5. ELATERIFORM • Wireworm • elongate, cylindrical, with a hard exoskeleton and tiny legs • Elateridae (click beetle)

  6. ERUCIFORM • Catterpillar-like • Cylindrical, obvious head, short antennae • Butterflies and moths

  7. PLATYFORM • Very flattened larva • Leg hidden or none • Diptera (flies), Lepidoptera, Coleoptera (beetle)

  8. VERMIFORM • Maggot (berengga) • legless, head undeveloped • Diptera (flies) • circular in cross section and tapering to a point, they do not possess legs

  9. INSECTS PUPAE • EXARATE (EKSARAT) • the appendages, legs etc., are free and capable of movement • Most orders except butterflies (lepidoptera) & flies (Diptera)

  10. OBTECT (OBTEK) • the legs and other appendages are closely appressed to the rest of the body • not capable of free movement • butterflies

  11. COARCTATE (KOARKTAT) • Enclosed within the last larval skin • acts as a cocoon protects the pupa • flies (Diptera, of the sub-order Cyclorrhapha.).

  12. ASEXUAL REPRODUCTION • Benefit: • Rapid increase in number • Close match between organism & environment • Save time: don’t have ti find and court mate • Disadvantage: offspring (anak) not variable • 3 modes(cara): • 1) HERMAPHRODISM: egg & sperm produce by same individual • 2) GYNOGENESIS: egg is activated by the presence of sperm in order to develop. However, the sperm cell does not contribute any genetic material to the offspring. • 3) PARTHENOGENESIS: reproduction without fertilization (persenyawaan)

  13. PARTHENOGENESIS • 1) ARRHENOTOKY • unfertilisedeggs develop into males • Bees, ants, wasps • 2) THELYTOKY • Unfertilized eggs turn to female • aphid

  14. ♀ ovipositor EGG LAYING • use ovipositor • variaton: • long, tubular- sticking eggs into hard suface • Long-horned grasshopper, parasitic wasp • Some are short 6-7 cm

  15. Eggs hatch to produce larva/nymph • METAMORPHOSIS: • 1) AMETABOLOUS • Without metamorphosis or unclear • Silverfish (Thysanura) • 2) HEMIMETABOLOUS (EXOPTERYGOTA) • Incomplete m/morphosis (eggnymph/naiadadult) • a) Paurometabolous: the nymph and the adult would live in the same environment (grasshopper,cricket) • b) Heterometabolous: the nymph & adult live in different environments. For example, Odonata naiad live in the water and cicada nymph underground, whereas the adults are aerial. • 3) HOLOMETABOLOUS (ENDOPTERYGOTA) • Complete m/morphosis (egglarvapupaadult)

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