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Chondrichthyans

Chondrichthyans. Dan Fitzpatrick & Elizabeth Ezrike. Major Classes. Holocepheli. Elasmobranchii. Examples Of Species. Great White Shark Manta Ray Tiger Shark. General Facts. Live in marine conditions. More specifically, they live in oceans as well as sand, mud, reefs, and rivers.

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Chondrichthyans

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  1. Chondrichthyans Dan Fitzpatrick & Elizabeth Ezrike

  2. Major Classes Holocepheli Elasmobranchii

  3. Examples Of Species Great White Shark Manta Ray Tiger Shark

  4. General Facts • Live in marine conditions. More specifically, they live in oceans as well as sand, mud, reefs, and rivers. • There are slightly under 1,000 species of Chondrichthyes known to exist, and it is predicted that approximately 1,200 exist.

  5. Interesting Facts & Importance to Humans • Sharks are the only animals with an entire week dedicated to them. • Shark attacks are quite uncommon; only 60 shark attacks per year are reported, most of which are non-fatal. • In some Asian markets, shark fins can be sold for $300 per pound • Sharks eat abundant species as prey, therefore balancing the ecosystem • Sharks, in their hunting, actually use mathematical principles. (http://www.sciencenews.org/view/generic/id/60106/title/Sharks_use_math_to_hunt )

  6. External Features Placoid Scales (don’t grow)

  7. Internal Anatomy

  8. Type of Symmetry Bilaterally Symmetrical

  9. Type of Skeleton Mostly cartilage, calcium impregnated.

  10. Life Cycle • OVIPAROUS: EXTERNAL FERTILIZATION OF EGGS • OVOVIVIPAROUS: EGGS  KEPT IN MOTHER AND HATCHES IN MOTHER • VIVIPAROUS: PLACENTAL CONNECTION VIA UMBILICAL CORD

  11. Distinguishing Characteristics • Spiral valve digestive tract • No lungs or eardrums • Use muscles in jaw to push water through gills when at rest. • Nostrils are closed, used for olfaction • One opening for anus and reproductive tract called the cloaca • Rays use their pectoral fins as water wings • Regions in the head have sensory glands

  12. Bibliography • 2. INTRODUCTION. (n.d.).FAO: FAO Home. Retrieved February 17, 2011, from http://www.fao.org/docrep/003/x8692e/x8692e06.htm • ADW: Chondrichthyes: Pictures . (n.d.). Animal Diversity Web. Retrieved February 17, 2011, from http://animaldiversity.ummz.umich.edu/site/accounts/pictures/Chondrichthyes.html • Introduction to the Chondrichthyes. (n.d.). UCMP - University of California Museum of Paleontology. Retrieved February 17, 2011, from http://www.ucmp.berkeley.edu/

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