1. Characteristics of Osteichthyes

• Class Osteichthyes

• Subclass Actinopterygii

  • Infraclass Chondrostei (bichers, sturgeons, paddlefishes)

  • Infraclass Holostei (gars and bowfins)

  • Infraclass Teleostei

  • Evolutionary trends within the Actinopterygii

• Subclass Sarcopterygii

  • Superorder Dipnoi (lungfishes)

  • Superorder Crossopterygii

    • Order Rhipidistia (lobe-finned fishes)

    • Order Actinistia (coelocanths)

• Drag

  • Viscous drag

  • Inertial drag

  • Adaptations of body form to reduce drag

• Propulsion

  • anguilliform undulations

  • carangiform undulations

  • ostraciform undulations

• Control of movement

• Visit an interesting Stanford University site that investigates: How Fish Swim

• Diffusion

• Pumps

  • Ventilation pump

  • Perfusion pump

• Gills

  • characteristics of gills

  • buccal pump

  • opercular pump

• Phylogeny of gills

  • reduction in the number of gill arches

  • reduction in interbranchial septum

  • division of gill rays

  • development of opercular pump

  • loss of spiracle

• Lungs and gas bladders

  • origin of gas bladder and lung

  • Rhipidistia and Actinistia

  • Dipnoi

  • Actinopterygii

Readings:

Chapter 3, pages 81-82

Chapter 8

Osteichthyes

Sarcopyterygii, Dipnoi, Crossopterygii, Rhipidistia, Actinistia

Actinopterygii, Chondrostei, Polypteriformes, Acipenseriformes

Holostei, Teleostei

cosmoid, ganoid, elasmoid scales

inertial drag, viscous drag, propulsion

aspect ratio

anguilliform, carangiform, ostraciiform undulatory motion

roll, pitch, yaw

primary lamella, secondary lamella

counter-current exchange system

buccal pump, opercular pump