高圓球蟲
高圓球蟲（學名：Sphaerexochus），又名凸圓球蟲，是生存於中奧陶紀至晚志留紀的一屬三葉蟲，生活在淺海礁石間，其化石分佈於亞洲、澳洲、歐洲及北美洲。這類三葉蟲的外骨骼很長且呈凸狀，有厚實的方解石外殼。其扁平的頭鞍佔據了整個寬闊的頭部，頰刺退化。胸部分為11節，中軸隆起而凸出，肋葉的末梢多刺且向下彎曲。短小的尾甲也長有刺。[1]和本屬相似且相關的屬為假高圓球蟲（Pseudosphaerexochus）。
高圓球蟲屬 | |
|---|---|
| |
| Sphaerexochus mirus | |
科學分類 
| |
| 界： | 動物界 Animalia |
| 門： | 節肢動物門 Arthropoda |
| （未分級）： | †類肢類 Artiopoda |
| 綱： | †三葉蟲綱 Trilobita |
| 目： | †鏡眼蟲目 Phacopida |
| 科： | †手尾蟲科 Cheiruridae |
| 屬： | †高圓球蟲屬 Sphaerexochus Beyrich, 1845 |
| 模式種 | |
| Sphaerexochus mirus Beyrich, 1845
| |
| 種 | |
物種
- Sphaerexochus arenosis Chatterton and Ludvigsen 1977
- Sphaerexochus arenosus Chatterton and Ludvigsen 1976
- Sphaerexochus atacius Ludvigsen 1979
- Sphaerexochus brandlyi Chatterton and Perry 1984
- Sphaerexochus bridgei Cooper and Kindle 1936
- Sphaerexochus britanicus Dean 1971
- Sphaerexochus calvus Mc Coy 1846
- Sphaerexochus dimorphus Whittington and Evitt 1953
- Sphaerexochus eurys Tripp 1962
- Sphaerexochus fibrisulcatus Lu 1975
- Sphaerexochus glaber Holloway 1980
- Sphaerexochus hapsidotus Whittington and Evitt 1953
- Sphaerexochus hiratai Kobayashi and Hamada 1964
- Sphaerexochus hisingeri Warburg 1925
- Sphaerexochus johnstoni Chatterton and Perry 1984
- Sphaerexochus laciniatus Lindström 1885
- Sphaerexochus latifrons Angelin 1854
- Sphaerexochus mirus Beyrich, 1845
- Sphaerexochus molongloensis Chatterton and Campbell 1980
- Sphaerexochus parvus Billings 1865
- Sphaerexochus pulcher Whittington and Evitt 1953
- Sphaerexochus romingeri Hall 1868
- Sphaerexochus scabridus Angelin 1854
- Sphaerexochus tuberculatus Warburg 1925
- Sphaerexochus valcourensis Shaw and Bolton 2011
參考文獻
- ^ Walker, Cyril; Ward, David. Fossils. Smithsonian Handbooks revised, illustrated. Dorling Kindersley. 2002: 59. ISBN 0789489848.
外部連結
- Sphaerexochus （頁面存檔備份，存於互聯網檔案館） in the Paleobiology Database