BIOL 1030 4/26 Notes
BIOL 1030 4/26 Notes BIOL 1030 - 002
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This 3 page Class Notes was uploaded by Emma Cox on Thursday April 28, 2016. The Class Notes belongs to BIOL 1030 - 002 at Auburn University taught by Debbie R. Folkerts in Summer 2015. Since its upload, it has received 18 views. For similar materials see Organismal Biology in Biology at Auburn University.
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Date Created: 04/28/16
Ecdysozoa o P. Nematoda Round worms Cuticle, ecdysis Eutely (true end – precise number of mitotic division = each organism have same number of cells) and cryptobiosis (go dormant = hidden life) Many parasitic species Diverse, abundant, ubiquitous (everywhere) Longitudinal muscles only Ascaris Hooked end on male Female larger than male Fecal contamination – wash your hands Pinworm – Enterobius vermicularis Hookworm – on feet Necator americanus Trichina worm – trichinosis Comes from pork Guinea worm – Dracunculus medinensis Don’t drink unfiltered water o P. Tardigrada Ecological allstars Cosmopolitan – worldly = found all over the worlds Cryptobiotic – exist as a dormant tiny piece of dust that can withstand harsh conditions and float on the wind While in cryptobiosis called a tun: <1% water content No life processes during this condition May molt 12 times in their life (120 year sleep each time) Eutely Found in mosses and lichens Deuterostomes (second mouth) o Echinodermata o Chordata o And a few small phyla Echinodermata o Dermal ossicles – tiny bones embedded in skin – qualify them as having an internal skeleton – calcareous o All marine o Pentaradial symmetry – five part radial symmetry Secondary radial symmetry Egss hatch into bilaterally symmetrical forms and develop into adult radial form o Water vascular system – little tubes in body house and move water, move body parts, and change internal pressure Madreporite – water from the sea enters Stone canal – kept open by ringlike dermal ossicles Ring canal Radial canals Ampullae and tube feet – bags of water with suction cup on end; move about due to change of pressure in water vascular system o Pedicellariae (dermal jaws) Stalk extend from skin and have jaws at end Defense against predators and parasites Removal of debris Hiding o Autotomy and regeneration o Class Asteroidea Sea stars Ambulacral groove – walking grooves; house the two feet Aboral – side without mouth Oral – side with mouth Typically, oral surface is down cardiac (eversible) and pyloric stomachs o Class Ophiuroidea Brittle stars Supple arms used for grasping prey and filter feeding o Class Echinoidea Sea urchins, sea biscuits, sea cookies, sand dollars Dermal ossicles fuse together to form one solid test Prominent, movable spines Aristotle’s lantern o Class Holothuroidea Sea cucumbers, sea apples, sea pears Sedentary and errant forms Mouth on one end and anus on the other end (more extended on oral/aboral axis than sea star) Secondary bilateral symmetry Suspension feeders and deposit feeders (use tentacles) Evisceration Eversion of parts of digestive and reproductive tract to scare away predator but can regrow these if they are eaten o Class Crinoidea Sea lilies and sea feathers Oral up, aboral down Fossil crinoids o Class Concentricycloidea Sea daisies Most recently discovered class One peripheral row of tube feet
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