Ontogeny of the Furongian (late Cambrian) remopleuridioid trilobite Haniwa quadrata Kobayashi, 1933 from Korea: implications for trilobite taxonomy
Ontogeny of the Furongian (late Cambrian) remopleuridioid trilobite Haniwa quadrata Kobayashi, 1933 from Korea: implications for trilobite taxonomy
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DOI：
10.1017/s0016756810000701
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发表时间：
2011-03-01
影响因子：
2.3
通讯作者：
Choi, Duck K.
中科院分区：
文献类型：
--
作者：
Park, Tae-Yoon;Choi, Duck K.
三叶虫目的单一性受到了挑战。remopleuridiidea超科根据该群晚期富隆纪- tremadocian代表的腹正中缝合线和高度球根性柱头被纳入Asaphida目。remopleuridioid, Haniwa quadrata Kobayashi, 1933，来自韩国佛龙纪（晚寒武世）花铁组，代表Remopleuridioidea的原始形态。该三叶虫不具有典型的无棘原体的球形形态，在整个发育过程中，游离的双颊保持一轭在一起。这支持了先前的主张，即超科Remopleuridioidea应该从Asaphida目中排除。此外，奥陶系远尾叶三叶虫的高球状前体由低球茎前体演化而来，证实了高球状前体多重演化的可能性。可以认为，拥有高度球形的柱头并不能保证Asaphida教团的成员资格，因此应该修订Asaphida教团的概念。
The monophyly of the trilobite Order Asaphida has been challenged. The Superfamily Remopleuridioidea was included in the Order Asaphida, based on the ventral median suture and highly bulbous protaspis of the late Furongian-Tremadocian representatives of the group. The remopleuridioid, Haniwa quadrata Kobayashi, 1933 from the Furongian (late Cambrian) Hwajeol Formation of Korea, represents a primitive morphology of the Remopleuridioidea. This trilobite does not have a typical globular morphology of asaphoid protaspis, and the free cheeks remained yoked together during the whole of the development. This supports the previous proposition that the Superfamily Remopleuridioidea should be excluded from the Order Asaphida. In addition, the evolution of a highly globular protaspis of the Ordovician remopleuridioid trilobites from the less bulbous protaspis corroborates the possibility of multiple evolutions of a highly globular protaspis. It can be argued that the possession of a highly globular protaspis does not guarantee the membership of the Order Asaphida, and thus the concept of the Order Asaphida should be emended.