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Lotagnostus : ウィキペディア英語版
Lotagnostus

''Lotagnostus'' is a genus of very small trilobites in the order Agnostida, which lived on the outer shelfs worldwide, during the late Upper Cambrian. It was described by Whitehouse in 1936, and the type species is ''Lotagnostus trisectus'', which was originally described as a species of ''Agnostus'' by Salter in 1864.〔(Available Generic Names for Trilobites ) P.A. Jell and J.M. Adrain.〕
== Taxonomy ==
The Treatise on Invertebrate Paleontology divides ''Lotagnostus'' into three subgenera that differ in the degree of effacement: ''L. (Lotagnostus)'' Whitehouse, 1936 (neither cephalon nor pygidium strongly effaced), ''L. (Distagnostus)'' Shergold, 1972 (strongly effaced on the outer/dorsal surface, but with clear furrows on the inner/ventral surface and ''L. (Eolotagnostus)'' Zhou ''in'' Zhiqiang Zhou, li & Qu, 1982 (with even the inner/ventral surface strongly effaced). Later authors however consider it likely that creating these subgenera would render the nominate subgenus paraphyletic.

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