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Entomology for the Masters - a brief history - insect overview - Order recognition - identification activity - plant damage - garden friend and foe Michael Meyer, Ph.D. Dept. Organismal and Environmental Biology Christopher Newport University
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John Henry Comstock - the first entomology instructor Comstock Traver Edmunds McCafferty Meyer
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What’s not an insect [or “bug”]?
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Class: Arachnida (arachnids) Order: Opiliones (harvestmen) - single body segment - predators; scavengers of animals and plants - repellent secreted as defense
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Class: Arachnida (arachnids) Order: Acari (mites, ticks, chiggers) - variety of life histories - predators, herbivores, parasites, suspension feeders - terrestrial and aquatic (fresh and salt water) - may be vectors of disease
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Class: Arachnida (arachnids) Order: Araneae (spiders) - poison = protein-digesting - fangs are distal portion of chelicerae - spinnerets and silk (six main kinds) production
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Class: Diplopoda [millipedes] - generally cylindrical - 2 pair of legs on body segments - slow; feed on plants or decaying materials
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Class: Chilopoda [centipedes] - flattened; one pair of legs on body segments - fast: predators, feed on insects/other arthropods - poison jaws paralyze prey
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Why should “we” study entomology?
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Why should we study entomology? 1.Insects are the dominant group of animals. - the Earth’s most varied organism - 80% of all known animals, 57% of all life - >1 million described species [54K vertebrates]
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2. Many insects are valuable to us. - produce goods (i.e., honey, silk), services (i.e., pollination, pest control), and food (i.e., fruits, vegetables) - research animals (i.e., Drosophila, bomb-sniffing wasps)
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3. Some insects are harmful. - destroy crops, animals, and possessions - transmit human disease - just plain annoying
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4. Insects are fascinating/interesting. - beautiful, fascinating organisms - used throughout human culture/history
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Why are insects so successful?
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Factors in the success of insects. 1.Highly adaptable exoskeleton. -legs suited for locomotion on land and in water -tracheae system for respiration -wax covering to reduce the loss of moisture
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2. Colonization of the terrestrial environment before chordates. - Early Devonian (410 MYA) = first fossil record - Early Jurassic (200 MYA) = therians (early mammals)
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3. Small body size. - occupy an enormous variety of small places
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4. High birthrate and short generation time. - little time to grow to maturity (due to small size) - increased potential for genetic change in populations
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5. Highly efficient flight. - escape unfavorable habitats and colonize new ones - escape enemies, find food, mates, places to oviposite
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6. Life history with metamorphosis. - reduced competition between larvae and adults - larvae utilized food inaccessible to adults
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Generalized Body Regions
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Head - mouthparts
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Wings
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- generalized [membranous] [dragonfly]
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Wing modification
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- elytra [beetle]
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Wing modification
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- hemelytra [true bug]
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Wing modification A Blan
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Wing modification A Blan - tegmina [roaches and “songsters”]
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Wing modification
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- halteres [true flies]
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Abdomen
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Aphids: cornicles
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Abdomen
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Earwig: modified cerci
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How well do you know the insect Orders?
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Ephemeroptera [for a day wings] (Mayflies) - larvae are aquatic - subimago life stage - adults w/ vestigial mouthparts - adults w/ two or three long “tails”
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Odonata [tooth] (Dragonflies and Damselflies) - larvae are aquatic, w/ prehensile labium - wings held perpendicular or parallel to body - predators; catch basket - live 3/4 weeks [damsel], 6/10 weeks [dragon]
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Orthoptera [straight wings] (Grasshopper, Crickets, and Katydids) - generally with modified hind legs - thickened forewings called tegmina - many are musicians - most are plant feeders [i.e., pests]
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Phasmatodea [small phantom] (Walking Sticks) - camouflaged, stick-like body - elongate thorax; reduced or absent wings - eggs scattered on ground [dropped from trees]
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Dermaptera [skin wings] (Earwigs) - modified cerci: female strait, male curved - reduced forewings [winged] or wingless - antennal segments increase with molts - nocturnal, most feed on plant matter
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Isoptera [equal wings] (Termites) - multiple casts: queen, king, workers, soldiers - cellulose eating; many with symbiotic protozoan - often referred to as “white ants”
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Mantodea [soothsayer] (Mantids) - can move head capsule - modified forelegs with elongate spines - overwinter as eggs in ootheca [200+ eggs] - many species in US are introduced
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Blattodea [cockroach] (Cockroaches) - oval, flattened; cursorial - leathery forewings [tegmina] - head concealed by pronotum - egg capsule [ootheca] - primarily tropical; annoying
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Hemiptera [half wings] (True Bugs, Cicadas, Hoppers, Whiteflies, Scales) - piercing-sucking mouthparts - huge diversity: body form, wings, antennae - predators, herbivores, parasites: may be vectors
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Coleoptera [sheath wings] (Beetles) - modified forewing [elytra] - rule the world (by numbers); 30,000 species in NA - tremendous variation of habitats and life history strategies
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Neuroptera [nerve wings] (Alderflies, Lacewings, Antlions, Owlflies, etc.) - soft bodied, wings with many crossviens - larvae and adults predaceous; diverse
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Hymenoptera [god of marriage wings] (Sawflies, Wasps, Ants, Bees) - many have slender waist [pedicel] - many social; most important pollinators - hugely beneficial (i.e., predators, parasitoids) - ovipositor modified into a sting [some]
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Lepidoptera [scale wings] (Butterflies, Skippers, Moths) - scales cover wings, body and legs - variety of antennae; coiled proboscis - 11,500 species in NA; can be plant pests - some with tympanum to detect bat echolocation
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Mecoptera [long wings] (Scorpionflies) - 9-25 mm in length; known as snow fleas - male genitalia similar in appearance to scorpion sting - many extant families/genera found in fossil record
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Diptera [two wings] (Flies, Midges, Mosquitos) - modified hind wings [halteres] - great diversity of natural history strategies; many are pests; vector of many diseases - variety of mouth types
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Identification Activity Can you identify each of the insect Orders?
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Insect caused plant damage. What gets eaten?
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Insect damage. - leaf chewers [Coleoptera and Orthoptera]
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Insect damage. - leaf miners [Diptera]
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Insect damage. - fruit and flower feeders [Diptera and Hymenoptera]
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Insect damage. - sap suckers [Hemiptera and “Homoptera”]
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Insect damage. - gall makers [Diptera and Hymenoptera]
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Insect damage. - stem and twig damagers [Orthoptera and “Homoptera”]
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Insect damage. - trunk and branch borers [Coleoptera]
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Insect damage. - root and bulb feeders [“Homoptera”]
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Garden foes.
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A. Caterpillars [Lepidoptera]
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Garden foes.
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B. Beetles [especially weevils; Coleoptera: Curculionidae]
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Garden foes.
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C. Yellow jackets [Hymenoptera: Vespidae]
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Garden foes. D. A plethora of sapsuckers
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Garden foes.
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D1. Aphids [Hemiptera: Aphidae]
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Garden foes.
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D2. Psyllids [Hemiptera: Psyllidae]
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Garden foes.
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D3. Mealybugs [Hemiptera: Pseudococcidae]
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Garden foes.
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D4. Scale insects [many: Hemiptera]
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Garden foes.
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D5. Leafhoppers, treehoppers, spittlebugs [Hemiptera: Cicadellidae, Membracidae, Cercopidae]
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Garden foes.
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D6. Stinkbugs [Hemiptera: Pentatomidae]
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Garden foes.
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D7. Lace bugs [Hemiptera: Tingidae]
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Garden foes.
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D8. Thrips [Thysanoptera]
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Garden friends [predators].
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Lady bird beetles [Coleoptera: Coccinellidae]
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Garden friends [predators].
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Ground beetles [Coleoptera: Carabidae]
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Garden friends [predators].
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Rove beetles [Coleoptera: Staphhylinidae]
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Garden friends [predators].
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Fireflies [Coleoptera: Lampyridae]
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Garden friends [predators].
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Lacewings (larva) [Neuroptera: Chrysopidae]
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Garden friends [predators].
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Lacewings (adult) [Neuroptera: Chrysopidae]
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Garden friends [predators].
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Hover flies [Diptera: Syrphidae]
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Garden friends [predators].
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Stink bugs [Hemiptera: Pentatomidae]
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Garden friends [predators].
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Assassin bugs [Hemiptera: Reduviidae]
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Garden friends [predators]. Assassin bugs [Hemiptera: Reduviidae]
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Garden friends [predators].
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Mantids [Mantodea: Mantidae]
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Garden friends [predators].
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Ants [Hymenoptera: Formicidae]
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Garden friends [predators].
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Paper wasps [Hymenoptera: Vespidae]
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Garden friends [predators].
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Yellow jackets [Hymenoptera: Vespidae]
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Garden friends [parasites].
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Tachinid flies [Diptera: Tachinidae]
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Garden friends [parasites].
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Ichneumonids and Braconids [Hymenoptera: Ichneumonidae and Braconidae]
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Garden friends [parasites]. Many small wasps [Hymenoptera]
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Thank you very kindly!
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