目 摘要 for Pleuronectiformes
|
主要參考文獻 |
: |
||||||
目 |
: |
Pleuronectiformes flatfishes |
|||||
綱 |
: |
Teleostei |
|||||
姊妹目 |
: |
Tetraodontiformes 15 M years |
|||||
參考文獻 |
: |
||||||
最早的化石記錄 |
: |
late Tertiary |
|||||
生存於 |
: |
海洋 |
淡水 |
半鹹淡水 |
|||
附註 |
: |
Adults not bilaterally symmetrical, with one eye migrating to the other side of the cranium; dorsal and anal fins with long bases, dorsal fin base overlapping at least the neurocranium except in Psettodes; body highly compressed, somewhat rounded on eyed side and flat on blind side; eyes can protrude above body surface allowing fish to see when buried in the substrate; usually six or seven branchiostegal rays, rarely eight; body cavity small; adults almost always without swim bladder; scales cycloid, ctenoid, or tuberculate.
About four species probably occur in freshwater, while another 20 species that are normally marine occasionally enter freshwater. |
|||||
綱 詞源 |
: |
Greek aktis = ray, thunderbolt, beam + Greek pterygion, diminutive of pteryx = wing, fin. Ref. 45335. |
|||||
目 詞源 |
: |
Greek, pleura = similar, ribe, side + Greek, nektos = to swim + Latin, forma = shape. 1849 (Ref. 45335). |
|||||
科 |
: |
Converted to PHP by Kit 06.10.09 |