Manuel Quiring

化石拍賣（私人收藏）

Ricinoidea（遮罩蛛目）在古生物学中占有著名的地位，因为它们是极少数在被发现活着之前就已以化石形式被发现的生物之一。如今存活的物种对光高度回避、性情隐秘，而它们的祖先在古生代时期曾经繁盛且多样。

大约四分之三的已知遮罩蛛目化石种来自晚石炭纪的煤层，主要在欧洲和北美发现。古生物学家将这些古老成员分入已灭绝的亚目——古遮罩蛛目（Palaeoricinulei）。

向树木的转变：以琥珀内保存的已灭绝成员（如在亚目原棘遮罩蛛目 Primoricinulei 下的 Hirsutisoma grimaldii）呈现不同的生态位。基于它们毛茸茸的体表结构和足部适应性，科学家认为在白垩纪时期，它们生活在树皮上，作为树栖掠食者，而不是仍埋藏在土壤中。

遮罩蛛目是一类极小且神秘的蛛形纲动物，常被称为“披风式蜱蛛”，尽管它们既不是典型的蜘蛛也不是蜱虫。它们是以叶片碎屑或洞穴为栖息地的掠食性节肢动物，通常体长不足1厘米。

时期：白垩纪（距今约1亿年）
地点：缅甸，姆里冈谷（Hukawng Valley）
尺寸：琥珀体长22×14.5×5 mm

  The Order Ricinulei holds a famous place in paleontology because they are one of the very few organisms discovered as fossils before they were ever found alive. While today's surviving species are highly light-avoiding and secretive, their ancestors were once thriving and diverse during the Paleozoic Era.
  
  Roughly three-quarters of all known Ricinulei fossil species come from the Late Carboniferous coal measures, primarily found in Europe and North America. Paleontologists group these ancient members into the extinct suborder Palaeoricinulei.

  A Shift to the Trees: Extinct members preserved in amber (such as Hirsutisoma grimaldii under the suborder Primoricinulei) show a different ecological niche. Based on their hairy body structures and leg adaptations, scientists believe that during the Cretaceous, they lived on tree bark as arboreal predators, rather than staying buried in the soil.

  Ricinulei is a very small, mysterious order of arachnids. They are commonly known as "hooded tickspiders," although they are neither true spiders nor ticks. They are predatory arthropods that live in leaf litter or caves, usually measuring less than 1 centimeter in length.
  
Period: Cretaceous (100 million years old)
Location: Hukawng Valley, Myanmar
Size: Amber 22*14.5*5 mm



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琥珀 - Fossil matrix - Ricinulei(Spider relatives) - 22 mm - 14.5 mm

白堊紀， 上 (10050 - 6600 萬年)

台灣

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琥珀 - Fossil matrix - Ricinulei(Spider relatives) - 22 mm - 14.5 mm

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