Astyanax fasciatus (Mexican blind cavefish) 2 (15099483704)
描述:
Summary.mw-parser-output table.commons-file-information-table,.mw-parser-output.fileinfotpl-type-information{border:1px solid #a2a9b1;background-color:#f8f9fa;padding:5px;font-size:95%;border-spacing:2px;box-sizing:border-box;margin:0;width:100%}.mw-parser-output table.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{vertical-align:top}.mw-parser-output table.commons-file-information-table>tbody>tr>td,.mw-parser-output table.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:4px}.mw-parser-output.fileinfo-paramfield{background:#ccf;text-align:right;padding-right:0.4em;width:15%;font-weight:bold}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{border-top:0;padding-top:0;margin-top:-8px}@media only screen and (max-width:719px){.mw-parser-output table.commons-file-information-table,.mw-parser-output.commons-file-information-table.fileinfotpl-type-information{border-spacing:0;padding:0;word-break:break-word;width:100%!important}.mw-parser-output.commons-file-information-table>tbody,.mw-parser-output.fileinfotpl-type-information>tbody{display:block}.mw-parser-output.commons-file-information-table>tbody>tr>td,.mw-parser-output.commons-file-information-table>tbody>tr>th,.mw-parser-output.fileinfotpl-type-information>tbody>tr>td,.mw-parser-output.fileinfotpl-type-information>tbody>tr>th{padding:0.2em 0.4em;text-align:left;text-align:start}.mw-parser-output.commons-file-information-table>tbody>tr,.mw-parser-output.fileinfotpl-type-information>tbody>tr{display:flex;flex-direction:column}.mw-parser-output.commons-file-information-table+table.commons-file-information-table,.mw-parser-output.commons-file-information-table+div.commons-file-information-table>table{margin-top:-1px}.mw-parser-output.fileinfo-paramfield{box-sizing:border-box;flex:1 0 100%;width:100%}} Description: Astyanax fasciatus (Cuvier, 1819) (or Astyanax mexicanus (De Filippi, 1853), depending on one's taxonomic preferences) - Mexican blind cavefish from southern Mexico (captive, Newport Aquarium, Newport, Kentucky, USA). Many caves are known to have blind fish in subterranean bodies of water. Members of several unrelated families have become blind cavefish. This is the Mexican blind cavefish, Astyanax fasciatus (sensu lato), which has been recorded from throughout Central America. It completely lacks eyes (eyes are useless in a permanently dark environment) and also has no pigmentation (hence the pinkish color from blood). However, this species does still possess the genes for eyes. Why? It’s ancestors did have eyes - they’ve been lost through evolution. This is the ultimate fate for all vestigial organs. However, the genes for lost structures are often retained for long geologic intervals of time (for example, chickens still have genes that code for teeth, despite the lack of teeth in chicken beaks). New info. - recent published research has determined that young cavefish of this species do have functioning eyes and have a light-sensitive area in their brains. The eyes degenerate with ontogeny, as does the light-sensitive area in the brain. The adults have zero light sensing ability. Classification: Animalia, Chordata, Vertebrata, Actinopterygii, Cypriniformes, Characoidei, Characidae. Date: 19 March 2007, 11:54. Source: Astyanax fasciatus (Mexican blind cavefish) 2. Author: James St. John.
包含在以下頁面:
- Life
- Cellular
- Eukaryota (真核生物)
- Opisthokonta
- Metazoa
- Bilateria
- Deuterostomia (後口動物)
- Chordata (脊索動物門)
- Vertebrata (脊椎動物亞門)
- Gnathostomata (有頜類)
- Osteichthyes (硬骨魚)
- Actinopterygii (輻鰭魚總綱)
- Neopterygii (新鰭亞綱)
- Teleostei (真骨下綱)
- Otomorpha (骨鲱群)
- Ostariophysi (骨鰾總目)
- Characiformes (脂鯉目)
- Characoidei
- Characidae (脂鲤科)
- Astyanax
- Astyanax mexicanus (墨西哥麗脂鯉)
此圖片未被精選在任何收藏裡。
來源資訊
- 許可
- cc-by-3.0
- 版權
- James St. John
- 原始內容
- 原始媒體檔案
- 參訪來源
- 合作夥伴網站
- Wikimedia Commons
- ID