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Unformatted text preview: 8-28-061) The insects are the most successful of all organisms--Currently 900,000 species of insectscould be 2-4 million--Only 250,000 plant species2) They are found almost everywhere, remarkable diversity3) Good pollinators, food, and lab specimens380 BC Theophrastus was 1stto recognize and acknowledge insects1734 Reamur further studied themFabricious tried to id every insect on earth1850s Asa Fitch was first that was paid to study insect8-30-06Why so many species?--These are called Sympatric speciation- Same PlaceAllophagic speciation-Different Feeding Allochronic- Different TimeParapatric speciation- Beside Place area effect, prefer different environmentsAllopatric speciation- Different Place land bridgeFounder effect- extreme case of geographic isolation only 1 founder probably by air9-1-06Taxonomy- discovery of patterns among variable or diverse group of individualsClassification- a framework of association that is formed from discovery of patterns (taxonomy)Phylogeny- study of evolutionary lineages, common ancestor*Kingdom, Phylum, Class, Order, Family, Genus, Species*********KNOW THE 4 ORDERS THAT HOLD WINGS ROOF LIKE OVER HEADPhylum: Arthropoda1) Jointed appendages2) Exoskeleton3) Ventral Nerve CordMyriapoda-Many Legs add body segment for each moltInsects never grow new segments9-6-06Non-insectKingdom: AnimalPhylum: ArthropodaSuperclass: HexapodaClass: Entognatha *Inside Mouth*Order: Collembola Springtails1) Tail which is used for locomotionOrder: Protura Proturans1) No antennae2) Most primitiveOrder: Diplura Diplurans1) Have antennae2) Have tails (tails called cerci)Kingdom: AnimalPhylum: ArthropodaSuperclass: HexapodaClass: Insecta1) 3 body segments (Head, Thorax, Abdomen)2) External mouth parts3) Have compound and simple eyes4) Antennae5) Thorax has a pair of legs for each body segment total of 6 legs6) Abdomen has 11 segments7) Malpighian tubulesRemove nitrogen waste8) Epimorphic Developmentnever grow new body segments9) Embryonic development, superficial cleavageSubclass: Apterygota1) No wings2) Molt after sexual maturity3) No copulationOrder: Microcoryphia Bristletails1) Dorso ventrally compressed- Flattened from top to bottom oval shaped2) Large compound eyes3) No wings4) Three cercimiddle is twice as longOrder: Thysanura Silverfish1) No wings2) Dorso ventrally compressed3) Small compound eyes4) Three same sized cerciSubclass: Pterygota *Winged*...
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- Spring '07