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INSECTS The most successful and diverse land animals (terrestrial ))

Insects succeed because: : 

Reproduce in LARGE NUMBERS first animals to evolve wings & FLY Flight allows some to feed on nectar & pollinate other plants (of same species). Insects succeed because:

FLIGHT allows insects to : 

patrol entire Earth search for food, mates, & nesting sites transport objects long distances FLIGHT allows insects to

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Entomology is the study of insects. Insects and their near relatives are ARTHROPODS (phylum).

Arthropod Characteristics : 

Segmented bodies ( head, thorax, abdomen) Jointed appendages (legs, antennae) Exoskeleton made of CHITIN that must be shed Arthropod Characteristics

Slide 6: 

Review of Zoological Nomenclature (classifying & naming) Taxonomic Categories Phylum Class Order Family Genus Genus & species

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Review of Zoological Nomenclature Taxonomic Categories Kingdom - Animalae Phylum - Arthropoda Class - Insecta Order - Coleoptera Family - Scarabaeidae Genus - Popillia Genus & species Popillia japonica Newman

Class Insecta : 

Largest group of organisms on earth More than half of all named species on earth are insects. hectare of lowland tropical rainforest is estimated to be inhabited by as many as 41,000 insect species Class Insecta

Some Insects harm people : 

Grasshoppers, boll weevils, and corn earworms EAT CROPS. Insects like fleas, mosquitoes, and flies transmit diseases caused by bacteria, protozoans and viruses! Termites eat wood & moths eat wool & carpet. Some Insects harm people

Insects are beneficial : 

vital in pollination of crops and flowering plants Serve as food for fish, birds and other animals Make honey, wax, shellac, & silk Help recycle nutrients (decay of plants & animals) Insects are beneficial

Insect External Features : 

three body segments three pairs of legs one pair of antennae modified mouthparts (mosquito, ? , fly) two solid wings usually small in size Insect External Features

Three distinct regions : 

HEAD -sensory perception, food gathering, neural intergration THORAX - locomotion (movement); legs & wings attached here ABDOMEN- houses organs of digestion, excretion, reproduction Three distinct regions

Exoskeleton made of CHITIN : 

Exoskeleton made of CHITIN

Grasshopper External Structure draw and label from packet : 

Grasshopper External Structure draw and label from packet

Feeding and Digestion : 

Feeding and Digestion

Circulation : 


Respiration : 


Excretion : 


Neural Control : 

Neural Control

Development : 


Complete Metamorphosis : 

Complete Metamorphosis

Incomplete Metamorphosis : 

Incomplete Metamorphosis

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General anatomy, physiology, and development of insects -- About 1 million species --12 aquatic/semiaquatic orders 3 distinct regions: head: sensory perception, neural integration, food gathering. Thorax: locomotion Abdomen: houses visceral organs (digestive, excretory, reproductive systems)

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Head Important external features: 1) Antennae -- contain chemical, olfactory, tactile, and auditory receptors. Can also sense vibrations. 2) Compound eyes (vision/movement/color) and dorsal ocelli (light detection). Many insects perceive ultraviolet, blue-green and red wavelengths. 3) Specialized mouth parts – food gathering, defense.

Slide 25: 

Head: Antennae

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Thorax Composed of 3 segments: 1) anterior – prothorax 2) middle – mesothorax 3) posterior -- metathroax Legs:

Insect Life Histories : 

Metamorphosis simple immature stages complete larvae pupa (chrysalis) Insect Life Histories

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Class Insecta Order Ephemeroptera (mayflies) Order Plecoptera (stoneflies) Order Odonata (dragon/damselflies) Order Trichoptera (caddisflies) Order Megaloptera (alderflies) Order Hemiptera (true bugs) Order Coleoptera (beetles) Order Neuroptera (spongillaflies) Order Lepidoptera (caterpillars) Order Diptera (flies and midges) Order Collembola (spring tails) Subphylum Uniramia

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Some interesting scientific names Colon rectum (leiodid beetle) Godzillius, Pleomothra (remipede crustaceans) Some very long scientific names Parastratiosphecomyia stratiosphecomyioides (a dipteran) Gymnometriocnemus kamimegavirgus (a chironomid) Gammaracanthuskytodermogammarus loricatobaicalensis (an amphipod)

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