Class chondrichthyes zoorepowt(1)
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Class chondrichthyes zoorepowt(1) Class chondrichthyes zoorepowt(1) Presentation Transcript

  • Class Chondrichthyes Mirabel, Camille Joyce Mercado, Pia Alyssa Rivera, John David
  • ETYMOLO G Y - Cartilages “Chondros’’ “Ichthyos’’ - Fish
  • Class Chondrichthyes Characteristics:  Cartilaginous fishes  Streamlined form with heterocercal tail  Cartilaginous skeleton  Leathery skin  With placoid scales ( dermal denticles )  Restricted notochord  Mouth and two nostrils ventral  Jaws and paired appendages  Male claspers  Eggs with large yolk
  • M O R P H O L O G Y
  • Taxonomical Hierarchy  Kingdom Animalia Phylum Chordata Subphylum Vertebrata Infraphylum Gnathostomata Class Chondrichthyes Subclass Elasmobranchii Orders Cladoselachii, Pleuracanthodii ( extinct sharks ) Orders Squaliformes Order Rajiformes Subclass Holocephali
  • Subclass Elasmobranchii   Sharks (Selachii) and the rays & skates  (Batoidea)   lives in most oceans in the world
  • Circulatory System Four chamber heart: sinus venosus, atrium, ventricle, and conus arteriosus. One direction of flow: Heart Gills Body Ectotherms/Endotherms
  • Reproductive System (Male)  Both testes functional  Seasonal reproduction cycle  Sperm stored in seminal vesicles  Both claspers functional
  • Reproductive System (Female)  One functional ovary in most viviparous species  Seasonal reproductive cycle  Fertilization in nidamental gland
  • Shark Mating  One clasper will rotate 90º and will be inserted into the female’s cloaca  Clasper will expand cartilaginous spurs to anchor in the female
  • Subclass Elasmobranchii: Orders Cladoselachii, Pleuracanthodii  extinct sharks
  • Order Squaliformes  sharks, body spindle-shaped; 5-7 pairs of lateral gills not covered by operculum, pectoral fins not enlarged example: Squalus
  • Order Rajiformes  skates, rays and sawfishes, body spreadout, pectoral fins enlarged and attached to head and body; five pairs of gill slits on ventral side, spiracles large
  • Subclass Holocephali • • • • chimaeras or ghost fish , gill slits covered with operculum; spirally closed; aberrant shaped; jaws with tooth plates; single nasal opening without scales; accessory clasping organs in male ; lateral line an open groove, Chimaera
  • Nervous System  Cerebellum is small  Medulla Oblongata is produced laterally into restiform bodies
  • Digestive System  The mouth in holocephali is small as compared to the wide mouth of Elasmobranch  It is bounded by three lips-like fold and equipped with the tooth plate having irregular surface and sharp cutting Edges
  • Urogenital System  The kidney of holocephalians is opisthonepric having a large number of uriniferous tubules and built upon the basic pattern other fishes.
  • Circulatory System  Heart is Built upon the pattern similar to other fishes.  The Heart is consists of a sinus venosus, artrium, ventricle and conus with three rows of valves.
  • Respiratory System A Mandibular pseudobranch is absent and hyoid bear only a Posterior Hemibranch.  The first,second and the third branchial arches have Holobranch but the forth Has a hemibranch.