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Unformatted text preview: 8-28-061) The insects are the most successful of all organisms--Currently 900,000 species of insects…could be 2-4 million--Only 250,000 plant species2) They are found almost everywhere, remarkable diversity3) Good pollinators, food, and lab specimens•380 BC Theophrastus was 1stto recognize and acknowledge insects•1734 Reamur further studied them•Fabricious tried to id every insect on earth•1850’s Asa Fitch was first that was paid to study insect8-30-06Why so many species?--These are called Sympatric speciation- “Same Place”•Allophagic speciation-“Different Feeding” •Allochronic- “Different Time”•Parapatric speciation- “Beside Place” area effect, prefer different environments•Allopatric speciation- “Different Place” land bridge•Founder 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 “Springtails”1) Tail which is used for locomotionOrder: Protura “Proturans”1) No antennae2) Most primitiveOrder: Diplura “Diplurans”1) 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 tubules…Remove nitrogen waste8) Epimorphic Development…never grow new body segments9) Embryonic development, superficial cleavageSubclass: Apterygota1) No wings2) Molt after sexual maturity3) No copulationOrder: Microcoryphia “Bristletails”1) Dorso ventrally compressed- Flattened from top to bottom oval shaped2) Large compound eyes3) No wings4) Three cerci…middle is twice as longOrder: Thysanura “Silverfish”1) No wings2) Dorso ventrally compressed3) Small compound eyes4) Three same sized cerciSubclass: Pterygota *Winged*...
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- Spring '07
- Hind, membranous wings, wings Order, Membranous front wings, Hold wings