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Grasshopper Dissection Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Orthoptera Background Information • • • • Insects are arthropods with jointed appendages, segmented bodies, and an exoskeleton composed of chitin. Insects are in the class Insecta & are the largest and most diverse group of animals on earth. Insects have three body regions (head, thorax, & abdomen), 3 pairs of legs attached to the thorax, a single pair of antenna attached to the head, mouthparts adapted for chewing or sucking, and two pairs of wings. Some insects may have a single pair of wings or may be wingless. Background Information • • • • Insect legs are often adapted for digging, crawling, jumping, or swimming. Insects are mostly terrestrial and breathe air which enters small lateral openings on the body called spiracles and circulates in a system of ducts to all organs and tissues. Their chewing or sucking mouth parts are adapted for feeding on plant or animal materials. Habitat: grasslands, meadows, fields Arthropods Arthropods make up the largest phylum of animals in the animal kingdom. Arthropod means “jointed foot”. All arthropods have jointed appendages. Arthropods also have segmented bodies and an external covering called an exoskeleton. Insects Insects are one type of arthropod. Insects have three body regions: a head, a thorax, and an abdomen. Antennae Compound Eyes Six Legs All insects also have six legs, one or two pairs of wings, one pair of antennae, and a pair of compound eyes. Parts Of The Head The grasshopper has 5 eyes, two compound eyes and three simple eyes (ocelli). The antenna are sensory organs located on the head. Mouth Parts The labrum is used to hold food. The mandibles are teeth used to chew food. The maxilla are used to chew and taste food. The labium is used to hold food while it is being chewed. Grasshoppers breath through tiny holes in their abdomen called spiracles. close up of one spiracle A female grasshopper has a longer abdomen than a male that ends with a four pointed tip called an ovipositor. The ovipositor is used to lay eggs. (ovary) heart brain anus esophagus rectum gizzard The esophagus is used to swallow food. The crop, gizzard,gastric ceca, stomach, large intestine, and small intestine are digestive organs. The rectum stores waste and the anus removes wastes from the body. The malpighan tubules collect waste from the blood. In the female grasshopper the ovaries produce eggs. In males, the testes produce sperm.