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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.
SCARABAEIFORM sluggish, cylindrical, c-shaped well-developed head and thoracic legs Scarabaeidae (beetle)
ELATERIFORM Wireworm elongate, cylindrical, with a hard
exoskeleton and tiny legs Elateridae (click beetle)
ERUCIFORM Catterpillar-like Cylindrical, obvious head, short antennae Butterflies and moths
PLATYFORM Very flattened larva Leg hidden or none Diptera (flies), Lepidoptera, Coleoptera
(beetle)
VERMIFORM Maggot (berengga) legless, head undeveloped Diptera (flies) circular in cross section and tapering to a
point, they do not possess legs
INSECTS PUPAE EXARATE (EKSARAT) the appendages, legs etc., are free and
capable of movement Most orders except butterflies
(lepidoptera) & flies (Diptera)
OBTECT (OBTEK) the legs and other appendages are
closely appressed to the rest of the body not capable of free movement butterflies
COARCTATE (KOARKTAT) Enclosed within the last larval skin acts as a cocoon protects the pupa flies (Diptera, of the sub-order
Cyclorrhapha.).
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)
PARTHENOGENESIS
1) ARRHENOTOKY unfertilised eggs develop into males Bees, ants, wasps
2) THELYTOKY Unfertilized eggs turn to female aphid
EGG LAYING use ovipositor variaton:
long, tubular- sticking eggs into hard suface Long-horned grasshopper, parasitic wasp Some are short
ovipositor♀
6-7 cm
Eggs hatch to produce larva/nymph METAMORPHOSIS:
1) AMETABOLOUS Without metamorphosis or unclear Silverfish (Thysanura)
2) HEMIMETABOLOUS (EXOPTERYGOTA) Incomplete m/morphosis (eggnymph/naiadadult) 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 (egglarvapupaadult)