External Structure of Insects, Functions & Locomotion Insect surface: exoskeleton & epidermis Head: Mouthparts, Antennae, Eyes Thorax:Thoracic segments,

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Presentation transcript:

External Structure of Insects, Functions & Locomotion Insect surface: exoskeleton & epidermis Head: Mouthparts, Antennae, Eyes Thorax:Thoracic segments, Wings, Legs Abdomen: Segments,Ovipositor,Cerci,Style

THE INSECT SURFACE (Exoskeleton ) - glycoprotein Dermal gland: produce pheromone, repellant

Function of Exoskeleton Body support Protection Water conservation Location of muscle attachment - allows movement Colouration & Camouflage

Exoskeletal Parts Tergite/Tergum (Dorsal,Abdomen) Notum (Dorsal, Thorax) Pleurum (Lateral) Sternite/Sternum

HEAD

MOUTH PARTS Clypeus Labrum (“upper lip”) Labium (‘lower lip’) Mandibles (‘jaw-like) Maxillae

maxilla labium mandible

ADAPTATIONS OF THE MOUTHPARTS MANDIBULATE – most primitive –Chewing (beetles, grasshoppers etc) HAUSTELLATE – sucking up liquid –A) Stylet – needle-like [Mosquito, Hemiptera(true bugs)] –B) Proboscis – siphon (Butterflies and moths) –C) Sponging – most flies

THE EYES 2 Types: a) Compound eye b) Ocelli (sing. Ocellus)

Compound eye

THE ANTENNA For touch and smell ( some case hearing)

THORAX Pro,meso,meta Notum & Pleuron Wings Legs

THORAX pro metameso FORE WING HIND WING pro metameso FORE WING HALTERE -balancing- DIPTERA- TRUE FLIES

pro metameso pro metameso NOTUM (DORSAL) PLEURON (LATERAL)

LEGS TROCHANTER COXA FEMUR TIBIA tarsus

TYPES OF INSECT’S LEGS CURSORIAL Wakling, running Ground beetles, cockroach

FOSSORIAL Front leg, digging soil Mole cricket

RAPTATORIAL Fore leg, adapted for catching prey Praying mantis

SALTATORIAL Hind leg, jumping Enlarge femur grasshoppers

NATATORIAL For swimmng With hairs Water beetles

POLLEN COLLECTING tibia adaptation (corbicula) Pollen basket

WINGS ELYTRON TEGMINA HEMIELITRON MEMBRANOUS HALTERE SCALE-LIKE FRINGED

Fringed-like Front wing Sword-like(bentuk pedang) Long hairs along the wind margin Order thysanoptera (berimbing)

Scale-like wing (butterflies & moths)