通常海膽化石的刺棘多半不容易保存下來，歐洲侏羅紀地層出土的半頭帕海膽化石刺棘保留完美，算是相當難能可貴...
法國侏羅紀 Bajocian 地層除了出土豐富的菊石，半頭帕海膽化石也頗富盛名，海膽的刺棘保留完美，而且根部也非常清楚，深受化石朋友的喜愛。
這塊產自英國侏羅紀地層的 半頭帕海膽化石 標本，除了保留刺棘，也把口面最特別的 亞里斯多提燈 ( 海膽的牙齒 ) 清理出來，請大家一同欣賞吧 ! 
下面是賣家給的資料
name
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Acrosalenia hemicidaroides (rare double) |
| age | Jurassic, Bathonian, Great Oolite Series |
| size | Size of matrix 90mm x 90mm |
| location | Cheltenham, Gloucestershire, UK |
| weight | 262gms |
| description | |
A beautifully preserved double Acrosalenia echinoid fossil from a locality which no longer exists to collect from. Discovered during the early 1970's and prepared by Andy Cowap there is a nice bit of history to go with this fossil. Approximately 165 million years old.
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