File:Anomalocaris canadensis grasping claw, Burgess Shale.jpg
原始檔案 (1,797 × 1,198 像素,檔案大小:1.57 MB,MIME 類型:image/jpeg)
說明
摘要[編輯]
描述Anomalocaris canadensis grasping claw, Burgess Shale.jpg |
Anomalocaris canadensis Whiteaves, 1892 grasping claw (~8.5 cm long), preserved as a carbonized film in slightly metamorphosed shale from the Middle Cambrian-aged Burgess Shale of southwestern Canada (YPM 35138, Yale University’s Peabody Museum, New Haven, Connecticut, USA). The Middle Cambrian-aged Burgess Shale is the most famous fossil deposit on Earth. It is located near the town of Field in Yoho National Park, southeastern British Columbia, western Canada. The deposit is famous for its spectacular soft-bodied preservation - the organisms have had their appendages & internal organs preserved. Many tens of thousands of fossils have been collected from the Burgess Shale Formation over the last century. Including known, but unnamed species, and excluding known or demonstrable junior synonyms, the Burgess Shale biota totals at least ~280 species. Many claim that Charles Walcott discovered the Burgess Shale Lagerstätte (as soft-bodied fossil deposits are called by paleontologists) in 1909. However, it was actually discovered in 1886 or 1888 by Richard McConnell, based on anomalocarid appendage material from Mt. Stephen, in the Campsite Cliff Member of the Burgess Shale Formation. The main collecting localities have been two quarries (Walcott Quarry & Raymond Quarry) on the western side of the ridge connecting Mt. Field and Wapta Mountain a little north-northeast of Field. Numerous other smaller localities have been identified in the same area & for many, many kilometers to the south. Collecting at the Burgess Shale was most intense in 1910-1917 (Charles Walcott), 1925-1930 (Harvard’s Museum of Comparative Zoology), 1966-1967 (Geological Survey of Canada), and 1975-2000s (Royal Ontario Museum). Some of the most celebrated problematic fossil organisms from the Burgess Shale are the anomalocarids, the namesake of which is Anomalocaris canadensis Whiteaves, 1892. The genus name “Anomalocaris” means “strange shrimp”, which is ironically appropriate, because the name was given to fossil remains identified as shrimp bodies. But, anomalocarids are anything but shrimp. These creatures had medium-sized to large bodies (extrapolated up to ~3 meters long) with a head having a pair of grasping claws & short-stalked eyes & a pineapple ring-shaped mouth, plus a body with two lateral rows of swimming flaps. The first anomalocarid fossils (isolated grasping claws) were discovered in the 1880s from British Columbia’s Burgess Shale Formation. They were identified as shrimp bodies lacking heads (see this photo). In general, paleontologists didn’t recognize that these Anomalocaris fossils represented parts of a much larger organism. The true nature of the complete Anomalocaris organism wasn’t realized until very rare complete specimens were excavated from Burgess Shale quarries by the Royal Ontario Museum. The "headless shrimp" fossils turned out to be grasping claws at the head end of a large animal that could not be classified with any traditional arthropod group. New high-level taxa have been created to accommodate it (see Collins, 1996, Journal of Paleontology 70: 280-293). Classification: Arthropoda, Dinocarida, Radiodonta, Anomalocaridae Stratigraphy: Walcott Quarry Member, Burgess Shale Formation, Ptychagnostus praecurrens Interval-zone, lower Marjuman Stage, middle Middle Cambrian. Locality: Walcott Quarry, western side of ridge between Mt. Field & Wapta Mountain, north-northeast of the town of Field, southeastern British Columbia, southwestern Canada. |
日期 | |
來源 | Anomalocaris canadensis grasping claw (Burgess Shale Formation, Middle Cambrian; Walcott Quarry, above Field, British Columbia, Canada) |
作者 | James St. John |
授權條款[編輯]
- 您可以自由:
- 分享 – 複製、發佈和傳播本作品
- 重新修改 – 創作演繹作品
- 惟需遵照下列條件:
- 姓名標示 – 您必須指名出正確的製作者,和提供授權條款的連結,以及表示是否有對內容上做出變更。您可以用任何合理的方式來行動,但不得以任何方式表明授權條款是對您許可或是由您所使用。
這幅圖片原始出處為Flickr的https://www.flickr.com/photos/47445767@N05/15113335009 ,作者為jsj1771 。經機器人FlickreviewR在2014年九月21日審查後確定為採用cc-by-2.0的協議授權使用。 |
2014年九月21日
檔案歷史
點選日期/時間以檢視該時間的檔案版本。
日期/時間 | 縮圖 | 尺寸 | 用戶 | 備註 | |
---|---|---|---|---|---|
目前 | 2014年9月21日 (日) 20:38 | 1,797 × 1,198(1.57 MB) | Tillman(對話 | 貢獻) | Transferred from Flickr via Flickr2commons |
無法覆蓋此檔案。
檔案用途
沒有使用此檔案的頁面。
全域檔案使用狀況
以下其他 wiki 使用了這個檔案:
- ar.wikipedia.org 的使用狀況
- de.wikipedia.org 的使用狀況
- en.wikipedia.org 的使用狀況
- es.wikipedia.org 的使用狀況
- eu.wikipedia.org 的使用狀況
- nl.wikipedia.org 的使用狀況
- oc.wikipedia.org 的使用狀況
- pl.wikipedia.org 的使用狀況
- www.wikidata.org 的使用狀況
- zh.wikipedia.org 的使用狀況
詮釋資料
此檔案中包含其他資訊,這些資訊可能是由數位相機或掃描器在建立或數位化過程中所新增的。若檔案自原始狀態已被修改,一些詳細資料可能無法完整反映出已修改的檔案。
寬度 | 1,797 px |
---|---|
高度 | 1,198 px |
每像素位元 |
|
壓縮方式 | 未壓縮 |
像素合成 | RGB |
方位 | 標準 |
像素數量 | 3 |
水平解析度 | 300 dpi |
垂直解析度 | 300 dpi |
資料排列 | 矮胖格式 |
使用軟體 | Adobe Photoshop CS2 Macintosh |
檔案修改日期時間 | 2014年9月20日 (六) 14:49 |
色彩空間 | 顏色未校準 |
影像寬度 | 1,797 px |
影像高度 | 1,198 px |
數位化的日期時間 | 2006年11月27日 (一) 09:10 |
詮釋資料最後修改日期 | 2014年9月20日 (六) 10:49 |
IIM 版本 | 2 |