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CNIDARIA

CNIDARIA. MING MING AND KAREN. MENU. INTRODUCTION STRUCTURE FEEDING DIGESTIVE CIRCULATORY PICTURE OF CIRCULATORY PICTURE NERVOUS REPRESENTATIVE OTHERQUESTION ANSWER LINK. Introduction.

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CNIDARIA

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  1. CNIDARIA MING MING AND KAREN

  2. MENU • INTRODUCTION • STRUCTURE • FEEDING • DIGESTIVE • CIRCULATORY • PICTURE OF CIRCULATORY • PICTURE • NERVOUS • REPRESENTATIVE • OTHERQUESTION • ANSWER • LINK

  3. Introduction The phylum Cnidaria, formerly called Coelenterata* , contains the hydras , sea anemones , corals and jellyfish . They are radially symmetrical* animals, with one end of the body bearing the mouth and tentacles. Some live attached with the mouth directed upwards; others are free-swimming with the mouth directed downwards.

  4. STRUCTURE • The cnidaria are true metazoa* with 2 body layers - an outer epidermis and an inner feeding surface or gastrodermis. Between them is the non-cellular mesoglea, a gelatinous material which differs in thickness and structure amongst the different types of cnidarians.

  5. FEEDING • Some species of jellyfish do not use their nematocysts for food capture, but instead feed on suspended zooplankton and organic matter, drawn into the coelenterons* by currents of water generated by flagellae of the gastrodermal cells. • Others do use nematocysts, which can be charged with venom. The most potent is found in the tropical sea wasps or box jellies. A sting from a sea wasp can cause death in humans within twenty minutes!

  6. DIGESTIVE • The digestive jellifishs are the 'stomachs' of the colony and respond quickly to the presence of food, wriggling and twisting until they fasten their flexible mouths to it. Once attached they become all mouth, spreading out over the surface of the morsel. The resting polyp measures only 1-2 mm in diameter but the mouth may expand to more than 20 mm. They digest the food by secreting a full range of enzymes that variously break down proteins, carbohydrates and fats.

  7. CIRCULATORY • 水母的生活循環分為水母世代和水螅世代，所謂的水母世代是指一般看到的水母型態，浮游的雌、雄水母，可行有性生殖；而水螅世代是指我們不常見到的型態，牠們固著在水底生活，以分裂來進行無性生殖。水母的生命就在這兩個世代之間完成： • 成體---實囊幼蟲---缽口幼蟲---節裂體---碟狀幼蟲---水母幼體---有性生殖

  8. PICTURE OF CIRCULATORY

  9. NERVOUS

  10. REPRESENTATIVE 錢幣水母 屬刺胞動物門(Cnidaria)水母類，行浮游生活。直徑約３公分，觸手短而多；傘頂部有一硬質扁圓狀骨片。外觀淡藍色，一般屬大洋性，颱風過後常可見到與葡萄牙戰艦—僧帽水母(Physalia physalis)一起被吹上東北角海域的岸邊；本種毒性甚強，

  11. OTHER 直立穗珊瑚Nephthea erecta 屬八放珊瑚亞綱（軟珊瑚類）、穗珊瑚科，群體多分枝，行出芽生殖。照片中可見到有一共生之蛇尾綱—陽遂足的腕足；左下方為一浮游期小蝦。

  12. QUESTION • 1) WHICH IS ABOUT THE CINDARIA? • a) jellyfish b) echinodermuta c) annelida • d) ctenophora • 2) HOW DO THE JELLYFISH CIRCULATORY?

  13. ANSWER • 1) A. Jellyfish • 2) 成體---實囊幼蟲---缽口幼蟲---節裂體---碟狀幼蟲---水母幼體---有性生殖

  14. LINK • http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookDiversity%5F7.html#Tissues:%20Jellyfish,%20Corals%20and • http://www.ucmp.berkeley.edu/cnidaria/cnidaria.html • http://tolweb.org/tree?group=Cnidaria&contgroup=Animals • http://www-biol.paisley.ac.uk/courses/Tatner/biomedia/units/cnid1.htm • http://www.pbs.org/kcet/shapeoflife/animals/cnidaria.html • http://ourworld.compuserve.com/homepages/BMLSS/Cnidaria.htm • http://animaldiversity.ummz.umich.edu/cnidaria.html

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