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Invertebrates Rachel Reed & Erin Baxter
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Importance 95-99% of all species Pollination Recycling Food in many cultures Food webs Maintenance of ecological communities
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E.O. Wilson “If human beings were not so impressed by size alone, they would consider an ant more wonderful than a rhinoceros.”
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Basics Aquatic vs. Terrestrial – Arboreal, aerial Anatomical Definitions – Hemolymph, exoskeleton, hydrostatic skeleton Reproductive terms – Dioecious, hermaphroditic, parthenogenesis
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Considerations in Aquatic Care Marine vs. Freshwater Water quality Substrate, plants Light Water circulation Other species in aquaria Diet
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Considerations in Terrestrial Care Safe, sanitary, not crowded Temperature considerations Substrate, plants Water availability & mode of delivery Arboreal species? Air circulation Diet
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Ctenophora “Comb Jellies” Marine waters Carnivorous Diet Water requirements dependent on species Most are hermaphroditic Water Flow patterns are important
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Phylogeny
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Porifera “Sponges” Primarily Marine; sessile Water requirements dependent on species Unique feeding system; tiny pores; water flow necessary Reproduce by both sexual and asexual means
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Phylogeny
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Cnidaria AnemonesJellyfish Coral Radial symmetry,Hydrostatic skeleton, Dimorphic development Can sting!
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Anemones Marine Need excellent water condition Most capture animal prey; zooanthellae Variable but specific temperature requirements dependent upon species Asexual reproduction Interspecific Aggression
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Jellyfish Marine Water flow patterns Predators – have stingers! Sexual reproduction Lots of species variability
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Coral Marine Water Quality Important! Zooxanthellae; Most capture animal prey Sexual & Asexual Reproduction Can exhibit contact inhibition and interspecific aggression in the tank Hermatypic vs Ahermatypic
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Phylogeny
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Echinoderms Marine Water quality important- toxicity problems Diet is largely dependent on species Asexual & sexual reproduction dependent on species Water vascular system locomotion, gripping, feeding http://www.studentreader.com/files/purplestarfishonrocks.jpg
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Phylogeny
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Sea Squirts Sessile, marine Environmental management based on species Herbivorous diet Sexual or Asexual reproduction 90% of all urochordates http://www.lancashiremcs.org.uk/gallery/pics/sea-squirt.jpg
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Gastropods Marine & freshwater Sessile and mobile Filter feeders Tank Management Substrate Dioecious or hermaphroditic http://jrscience.wcp.muohio.edu/photos/SeagrassMolluscs.jpeg
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Cephalopods Marine Aquatic Varied diet Active hunters Tank Management Dioecious http://www.aquariumofpacific.org/images/olc/nautilusj.baecke r_berlin_zoo_aquarium_pd600.jpg
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Phylogeny
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Pogonophora & Vestimentifera Deep sea dwelling worms! Often grouped together www.ucmp.berkeley.edu www.nsf.gov
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Phylogeny
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Annelids Aquatic and terrestrial Varied diet and feeding strategies Environmental requirements dependent upon species Sexual reproduction; dioecious Biomedical & ecological importance http://www.education.umd.edu/blt/pic/Annelids.jpg
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Phylogeny
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Rotifers Most freshwater but some marine and terrestrial Omnivores Water Management Parthenogenic or dioecious
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Phylogeny
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Flatworms (Turbellarians) Mostly Aquatic Varied diet Commensal and parasitic Tank Management Varied reproduction http://www.dhadm.com/wp-content/uploads/2008/03/flatworm02.jpg
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Nematodes Aquatic & Marine Varied diet Mostly parasitic Environment Management Dieocious or parthenogenic http://soils.usda.gov/sqi/concepts/soil_biology/images/large_todes_LR.jpg
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Phylogeny
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Tardigrades Marine, freshwater & terrestrial “Water bears” Cryptobiosis http://www.uea.ac.uk/~b444219/images/TNWP_Echiniscus%20madonnae%20(SEM).jpg
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Phylogeny
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Onychophora Tropical, terrestrial Velvet worms or walking worms Prey on smaller arthropods
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Phylogeny
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Crustaceans Terrestrial and Aquatic Diet dependent on species Tank Management Dieocious Economic importance www.britannica.com/eb/art/print?id=104965
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Phylogeny
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Insects Predominantly terrestrial Varied Diet Environmental Management Reproduction Social Systems Economical & Ecological Importance
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Phylogeny
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Myriapods Terrestrial Diet dependent on species Well defined environmental requirements Dieocious; some parthenogenic
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Myriapods Millipedes Mostly herbivorous Two pairs per body segment Non-aggressive; slow Easy to handle Centipedes Mostly carnivorous One pair of legs per body segment Aggressive; fast! Extremely hard to handle; venomous http://www.garden-city.org/zoo/animalinfo/images/milipede_76pic.jpg http://cordially.narod.ru/album/insect/images/home-centipede.jpg
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Millipedes Substrate: 8-10cm of soil with 3-4cm of leaf litter on top Temperature Humidity Diet: leaf litter, fruits & vegetables Reproduction
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Centipedes Soil covered with leaf litter or mulch Temperature Humidity Light Diet: mix of live and dead invertebrates, dead pinky mice, day old chicks, adult mice, etc. Reproduction
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Phylogeny
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Horseshoe Crabs Marine, Aquatic Captive diet Various habitats Dieocious Limulus amebocyte lysate (LAL) extracted from hemolymph- Pharmaceutical use http://io.uwinnipeg.ca/~simmons/16cm05/1116/33-28-HorseshoeCrabs.jpg
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Phylogeny SPIDERS!
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Arachnids
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Scorpions Terrestrial Carnivorous Environment: mostly desert Sexual reproduction
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Spiders Aquatic & terrestrial Carnivores Diverse Environments Sexual Reproduction Silk!
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Terrestrial Spiders Arboreal vs. Non-arboreal Diet Substrate Temperature & humidity Lighting
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Aquatic Spiders Natural environment Diet Water Quality Underwater “air bells”
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Silk Made of Amino Acids Very stable Very Strong Genetic Isolation Production Application
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Resources Lewbart, Gregory (ed.). 2006. Invertebrate Medicine.Blackwell Publishing, Ames, Iowa. Frye, Fredric L. 1992. Captive Invertebrates. Krieger Publishing Company, Malabar, Florida. Pechenik, Jan A. 2000. Biology of the Invertebrates. McGraw-Hill. [5 th ed is 2005.]
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