A New Genus of Eugaleaspidiforms (Agnatha: Galeaspida) from the quot;urn:schemas-microsoft-com:office:smarttags" />quot;on">Ludlow , Silurian of quot;on">quot;on">Qujing , quot;on">Yunnan , quot;on">Southwestern quot;on">China
详细信息
- 责任者：Zhu Min (Key Laboratory of Evolutionary Systematics of Vertebrates ; Institute of Vertebrate Paleontology and Paleoanthropology ; Chinese Academy of Sciences ; Beijing 100044 ; China) ; Liu Yuhai
- 刊名：Vertebrata Palasiatica
- 出版年：2012
- 卷期：50(1)
- 关键词：盔甲鱼目 ; Galeaspiformes ; 云南 ; Yunnan Province
- 页码：p.1-7
- 图表：3 illus., 21 refs.
- 分类号：1103
- issnNo：ISSN1000-3118
- isbnNo：CN11-1905/Q
摘要
quot;EnDivSummary">A new genus and species of the Eugaleaspidiformes (Agnatha: Galeaspida), Dunyu longiforus gen.et sp.nov.,is described from the Ludlow (Silurian) Kuanti Formation of Qujing, Yunnan Province, Southwest China, in association with the oldest near-complete gnathostome Guiyu oneiros of the Xiaoxiang Vertebrate Fauna. The new genus is most suggestive of Eugaleaspis of the Eugaleaspidae by the absence of inner corners. The new species differs from Dunyu xiushanensis in its large cephalic shield which is longer than broad, spine-shaped corners, anteriorly positioned orbits, the length ratio between preorbital and postorbital portions of the shield less than 0.75, and large polygonal, flat-topping tubercles exceeding 2.0 mm in length.