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)