WHERE ARE ALL THE FOSSIL SEA SQUIRTS
WHERE ARE ALL THE FOSSIL SEA SQUIRTS
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DOI：
10.2307/1485758
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发表时间：
1988-01-01
影响因子：
1.5
通讯作者：
BROOKFIELD, ME
中科院分区：
文献类型：
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作者：
BROOKFIELD, ME
海鞘，或海鞘，是在许多海洋环境中常见的尾索动物。它们是独居的或形成附着在海底的小群体，经常含有小的文石骨针（大小通常小于0.1毫米），嵌入其测试中。这些骨针应该是常见的化石;然而海鞘类或其骨针的化石记录却很少。这些骨针是独特的，很少与海绵或其他生物体的骨针混淆。识别海鞘骨针化石是客观地研究它们的进化的唯一方法，也是评估它们在脊索动物进化中的地位的唯一方法。
Sea squirts, or Ascidians, are common Urochordates in many marine environments. They are solitary or form small colonies attached to the sea floor and frequently contain small aragonitic spicules (normally less than 0.1 mm in size), embedded in their tests. These spicules should be common as fossils; yet there are very few fossil records of ascidians or their spicules. These spicules are distinctive and should only rarely be confused with those of sponges or other organisms. Recognizing fossil ascidian spicules is the only way in which their evolution can be objectively worked out, and is the only way their place in Chordate evolution can be evaluated.