The ''evolution'' of Anomalocaris and its classification in the arthropod class Dinocarida (nov) and order Radiodonta (nov)
The ''evolution'' of Anomalocaris and its classification in the arthropod class Dinocarida (nov) and order Radiodonta (nov)
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DOI：
10.1017/s0022336000023362
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发表时间：
1996-03-01
影响因子：
1.4
通讯作者：
Collins, D
中科院分区：
文献类型：
--
作者：
Collins, D
Anomalocaris是来自不列颠哥伦比亚省5.15亿年前的中寒武纪伯吉斯页岩的非凡捕食者，其重建的显着“进化"反映了我们对地球上早期动物生命的解释在过去100年中的巨大变化。从1892年开始，Anomalocaris的部分被描述为水母，海参，多毛类蠕虫，水母和海绵的复合体，或者作为附属物附着在其他节肢动物身上。Charles D.沃尔科特在1911年至1917年收集了Anomalocaris nathorsti的完整标本，加拿大地质调查局在1966年或1967年收集了一个几乎完整的Anomalocaris canadensis标本，但直到1985年这两个物种都没有得到充分的描述。当时，他们被惠廷顿和布里格斯解释为“一个迄今未知的门的代表。“在这里，使用最近收集的标本，这两个物种被新重建并描述在Anomalocaris和Laggania属中，并被解释为灭绝的节肢动物纲Dinocarida和Radiodonta的成员，这是科学上的新发现。对Anomalocaris和Laggania的不准确重建和错误鉴定的长期历史证明了我们在从化石遗骸中可视化和分类许多寒武纪动物时的巨大困难，这些动物没有明显的生活后代。
The remarkable ''evolution'' of the reconstructions of Anomalocaris, the extraordinary predator from the 515 million year old Middle Cambrian Burgess Shale of British Columbia, reflects the dramatic changes in our interpretation of early animal life on Earth over the past 100 years. Beginning in 1892 with a claw identified as the abdomen and tail of a phyllocarid crustacean, parts of Anomalocaris have been described variously as a jellyfish, a sea-cucumber, a polychaete worm, a composite of a jellyfish and sponge, or have been attached to other arthropods as appendages. Charles D. Walcott collected complete specimens of Anomalocaris nathorsti between 1911 and 1917, and a Geological Survey of Canada party collected an almost complete specimen of Anomalocaris canadensis in 1966 or 1967, but neither species was adequately described until 1985. At that time they were interpreted by Whittington and Briggs to be representatives of ''a hitherto unknown phylum.''Here, using recently collected specimens, the two species are newly reconstructed and described in the genera Anomalocaris and Laggania, and interpreted to be members of an extinct arthropod class, Dinocarida, and order Radiodonta, new to science. The long history of inaccurate reconstruction and mistaken identification of Anomalocaris and Laggania exemplifies our great difficulty in visualizing and classifying, from fossil remains, the many Cambrian animals with no apparent living descendants.