1 / 14

SUPERCLASS AGNATHA Class Myxini Order Myxiniformes (hagfishes) Class Cephalaspidomorphi

SUPERCLASS AGNATHA Class Myxini Order Myxiniformes (hagfishes) Class Cephalaspidomorphi Order Petromyzontiformes (lamprey) SUPERCLASS GNATHOSTOMATA Class Chondrichthyes Subclass Holocephali Order Chimaeriformes (chimaeras) Subclass Elasmobranchii

lavalley
Download Presentation

SUPERCLASS AGNATHA Class Myxini Order Myxiniformes (hagfishes) Class Cephalaspidomorphi

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SUPERCLASS AGNATHA Class Myxini Order Myxiniformes (hagfishes) Class Cephalaspidomorphi Order Petromyzontiformes (lamprey) SUPERCLASS GNATHOSTOMATA Class Chondrichthyes Subclass Holocephali Order Chimaeriformes (chimaeras) Subclass Elasmobranchii 9 orders (sharks, rays, skates) Class Sarcopterygii Subclass Coelacanthimorpha Order Coelacanthiformes (coelacanths) Subclass Dipnoi Order Ceratodontiformes (Australian lungfish) Order Lepidosireniformes (S. American, African lungfish) Class Actinopterygii - (rayfins, higher bony fishes) Subclass Chondrostei Order Polypteriformes (bichirs, reedfish) Order Acipenseriformes (sturgeons, paddlefishes) Subclass Neopterygii Order Semionotoformes (Lepisosteiformes) (gars) Order Amiiformes (bowfin) Division Teleostei 35-38 orders (modern body fishes)

  2. Class Sarcopterygii (coelacanths, lungfishes) • lobed fins • bony supports to tips of fins • scales comprised of bone, dentine-like cosmine, and keratin • two dorsal fins

  3. SUPERCLASS GNATHOSTOMATA Class Sarcopterygii Subclass Coelacanthimorpha Order Coelacanthiformes (coelacanths) • marine, deepwater species • spiral valve intestine • lobed fins homologous to tetrapod limbs • discovered in 1938 by Margaret Latimer • fossil forms in fresh, shallow waters • 2 extant species Latimeria chalumnae

  4. SUPERCLASS AGNATHA Class Myxini Order Myxiniformes (hagfishes) Class Cephalaspidomorphi Order Petromyzontiformes (lamprey) SUPERCLASS GNATHOSTOMATA Class Chondrichthyes Subclass Holocephali Order Chimaeriformes (chimaeras) Subclass Elasmobranchii 9 orders (sharks, rays, skates) Class Sarcopterygii Subclass Coelacanthimorpha Order Coelacanthiformes (coelacanths) Subclass Dipnoi Order Ceratodontiformes (Australian lungfish) Order Lepidosireniformes (S. American, African lungfish) Class Actinopterygii - (rayfins, higher bony fishes) Subclass Chondrostei Order Polypteriformes (bichirs, reedfish) Order Acipenseriformes (sturgeons, paddlefishes) Subclass Neopterygii Order Semionotoformes (Lepisosteiformes) (gars) Order Amiiformes (bowfin) Division Teleostei 35-38 orders (modern body fishes)

  5. SUPERCLASS GNATHOSTOMATA Class Sarcopterygii Subclass Dipnoi Order Ceratodontiformes (Australian lungfish) 1 species

  6. SUPERCLASS GNATHOSTOMATA Class Sarcopterygii Subclass Dipnoi Order Lepidosireniformes (African, S. Am. lungfish) 5 species

  7. CeratodontiformesLepidosireniformes (Australian) (S. American, African) body compressed cylindrical pectoral, pelvic fins flipper-like filamentous scales large small gas bladder ("lung") unpaired paired larvae no external gills with external gills adults do not aestivate aestivate in dry season (both) bladelike, crushing dermal ‘teeth’

  8. Class Actinopterygii • 50% of known fishes • rayed fins • swim bladder (may be secondarily lost)

  9. SUPERCLASS AGNATHA Class Myxini Order Myxiniformes (hagfishes) Class Cephalaspidomorphi Order Petromyzontiformes (lamprey) SUPERCLASS GNATHOSTOMATA Class Chondrichthyes Subclass Holocephali Order Chimaeriformes (chimaeras) Subclass Elasmobranchii 9 orders (sharks, rays, skates) Class Sarcopterygii Subclass Coelacanthimorpha Order Coelacanthiformes (coelacanths) Subclass Dipnoi Order Ceratodontiformes (Australian lungfish) Order Lepidosireniformes (S. American, African lungfish) Class Actinopterygii - (rayfins, higher bony fishes) Subclass Chondrostei Order Polypteriformes (bichirs, reedfish) Order Acipenseriformes (sturgeons, paddlefishes) Subclass Neopterygii Order Semionotoformes (Lepisosteiformes) (gars) Order Amiiformes (bowfin) Division Teleostei 35-38 orders (modern body fishes)

  10. Bichir (Polypterus weeksi) • pelvic fins • ganoid scales and scutes • (abbreviate) heterocercal tail • skeleton largely cartilaginous • intestine with spiral value • paired lungs, breathe through mouth or spiracles • Reedfish • (Erpetoichthyscalabaricus) • no pelvic fins • paired lungs, spiracles • larvae have external gills • ganoid scales

  11. Acipenseriformes – paddlefish, sturgeon • ganoid scales (and scutes) • heterocercal tail • skeleton largely cartilaginous • intestine with spiral value • K-selected, globally threatened or endangered

  12. SUPERCLASS AGNATHA Class Myxini Order Myxiniformes (hagfishes) Class Cephalaspidomorphi Order Petromyzontiformes (lamprey) SUPERCLASS GNATHOSTOMATA Class Chondrichthyes Subclass Holocephali Order Chimaeriformes (chimaeras) Subclass Elasmobranchii 9 orders (sharks, rays, skates) Class Sarcopterygii Subclass Coelacanthimorpha Order Coelacanthiformes (coelacanths) Subclass Dipnoi Order Ceratodontiformes (Australian lungfish) Order Lepidosireniformes (S. American, African lungfish) Class Actinopterygii - (rayfins, higher bony fishes) Subclass Chondrostei Order Polypteriformes (bichirs, reedfish) Order Acipenseriformes (sturgeons, paddlefishes) Subclass Neopterygii Order Semionotoformes (Lepisosteiformes) (gars) Order Amiiformes (bowfin) Division Teleostei 35-38 orders (modern body fishes)

  13. Semionotiformes (Lepisosteiformes), Lepisosteidae 7 species • ganoid scales • abbreviated heterocercal tail • intestine with spiral valve • lung-like gas bladder longnose gar (Lepisosteus osseus)

  14. Amiiformes, Amiidae – 1 species • ganoid scales • abbreviated heterocercal tail • intestine with spiral value • lung-like gas bladder bowfin (Amia calva)

More Related