|
Remember the tooth 齿状物所记 A link is made in an ancient ecosystem 古生态系统的一环 WHO ate whom in the food chains of the past is rarely clear. 过去的食物链中谁吃谁的问题很少能明确下来。尽管哪些物种是捕食者， Though it is obvious which species were predators and which prey, 而哪些物种又是被掠食者显而易见， the subtle specialisations of feeding habit that allow many types of carnivore to co-existare rarely preserved in the fossil record. 但是让多种类型的肉食性动物共存的摄食习性的微妙法门却很少在化石记录中保存下来。 Rarely, but not never. 很少，不等于永远都没有。 That is why the recent discovery of a Jurassic ammonite with a shark s tooth embedded inits shell has excited palaeontologists. 这正是最近发现的一枚外壳中嵌有鲨鱼齿状物的侏罗纪鹦鹉螺化石令古生物学家兴奋的原因所在。 The ammonite in question, Orthaspidoceras, a species that thrived 155m years ago, 在1.55亿年前古鹦鹉螺是非常繁盛的物种， was part of the collection of an amateur who did not realise the significance of what he hadfound. | 
