File:Helicoprion ferrieri fossil shark jaw, Brewster County TX.jpg
原始文件 （2,635 × 1,818像素，文件大小：4.21 MB，MIME类型：image/jpeg）
摘要
| 描述 |
Helicoprion ferrieri (Hay, 1907) fossil shark jaw from the Permian of Texas, USA (public display, FMNH PF 7445, Field Museum of Natural History, Chicago, Illinois, USA). This remarkable fossil is a symphyseal tooth whorl from the lower jaw of an edestoid shark. It is in fossiliferous limestone of the Decie Ranch Member of the Skinner Ranch Formation (Wolfcampian Series, lower Lower Permian) from Dugout Mountain, northern Brewster County, Glass Mountains, western Texas, USA. Sharks have a cartilaginous skeleton and mineralized, phosphatic teeth (as are all vertebrate teeth). Helicoprion is undoubtedly the oddest shark in geologic history (see reconstructions elsewhere in this photo album). The specimen shown here is described in Kelly & Zangerl (1976) - Helicoprion (Edestidae) in the Permian of West Texas. Journal of Paleontology 50: 992-994. Classification: Animalia, Chordata, Vertebrata, Chondrichthyes, Elasmobranchii, Eugeneodontida, Edestoidea, Agassizodontidae/Helicoprionidae |
| 日期 | |
| 来源 | Helicoprion ferrieri fossil shark jaw (Skinner Ranch Formation, Lower Permian; Dugout Mountain, northern Brewster County, western Texas, USA) 1 |
| 作者 | James St. John |
许可协议
|
这幅图片原始出处为Flickr的https://www.flickr.com/photos/47445767@N05/15149774827 ，作者为jsj1771 。经机器人FlickreviewR在2014年9月26日审查后确定为采用cc-by-2.0的协议授权使用。 |
文件历史
点击某个日期/时间查看对应时刻的文件。
| 日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
|---|---|---|---|---|---|
| 当前 | 2014年9月26日 (五) 02:51 | | 2,635 × 1,818（4.21 MB） | Tillman | Transferred from Flickr via Flickr2commons |
文件用途
以下页面使用本文件：
全域文件用途
以下其他wiki使用此文件：
- en.wikipedia.org上的用途
- ja.wikipedia.org上的用途
