The Grasshopper Click here. Arthropods Insects There are more than 700,000 species that have been classified They are the largest & most diverse group.

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Presentation transcript:

The Grasshopper Click here

Arthropods Insects There are more than 700,000 species that have been classified They are the largest & most diverse group on earth Insects have three body regions Head, thorax, and abdomen

Dissecting

Mouth parts Mandibles- holding food Labrum- holding food Maxillae- chewing food Labium-holding food and tasting

Head Antennae Eyes ( simple) Mouth ( adapted so they can chew plants) They have crop and gizzard for grinding food

Thorax Three pair of legs (Legs are adapted for jumping to escape predators) One or two pair of wings – Some insects only have wings part of their life, or not at all

Abdomen Where the reproductive structures are found Insects have an open circulatory system and their blood DOES NOT carry oxygen They have spiracles instead- where air enters and waste gas leaves the body (oxygen & CO2)

Kingdom Animalia- Phylum Arthropoda- Class Insecta Order Orthoptera Class Insecta

Head Antennae (two, slender appendages) Compound eyes (2, large lateral) Ocelli (or simple eyes) - 3, small, between compound eyes Mouth parts - Labrum (upper lip), mandibles (jaws) below the labrum, maxillae located behind the mandibles to help cut & hold food, and the lower lip or labium

Tympanic membrane

ABDOMEN Spiracles (small openings on the side of somites or body segments) Auditory Organs (two located laterally on the 1st body somite or segment) Ovipositor (on female)

Ovipositor

THORAX Legs (first 2 pairs are for walking & the last pair are for jumping) Wings (forewings have a leathery appearance & protect the hind wings)