孔鳞鱼目
![](/Images/godic/202502/03/Holoptychius_BW0731.jpg")
孔鳞鱼目是一群远古鱼类，类似现代的肺鱼。
Porolepiformes
中文百科
英语百科
Porolepiformes 孔鳞鱼目
![](/Images/godic/202502/03/POROLEPIFORMES_DB150731.jpg")
![Laccognathus embryi](/Images/godic/202502/03/Laccognathus_embryi_-_reconstruction0731.jpg")
Porolepiformes is an order of prehistoric lobe-finned fish which lived during the Devonian period (about 416 to 359 million years ago). The group contains two families: Holoptychiidae and Porolepididae.
Porolepiformes was established by the Swedish paleontologist Erik Jarvik, and were thought to have given rise to the salamanders and caecilians independently of the other tetrapods. He based this conclusion on the shapes of the snouts of the aforementioned groups. This view is no longer in favour in Paleontology.
- negative displacement
- negative displacement pump
- negative dissipation
- negative dissipation instability
- negative distortion
- negative dobby
- negative doctor test
- negative draft
- negative dromotropic action
- negative dromotropic effect
- negative dromotropism
- negative dryer
- negative drying
- negative drying hanger
- Negative duration
- Negative duty
- negative easement
- negative echo
- Negative edge
- negative edge dislocation
- negative edges
- negative education
- negative effect
- negative effective mass amplifiers and generators
- negative effector