Epipunctae and phosphatized setae in late ordovician plaesiomyid brachiopods from Anticosti Island, Eastern Canada
Jin, Jisuo; Zhan, Renbin (詹仁斌); Copper, Paul; Caldwell, W. G. E.
2007-07-01
发表期刊JOURNAL OF PALEONTOLOGY
ISSN0022-3360
卷号81期号:4页码:666-683
摘要

Epipunctae, a new type of shell perforation, are well developed in typical taxa of the family Plaesiomyidae, a group of common orthide brachiopods from Laurentia and some other tropically located tectonic plates of Late Ordovician age. These minute, prominently elongate, tubular structures are similar to endopunctac in size and density, but differ in being oblique, intersecting the shell surface at a relatively low angle, and being confined largely to the outer portion of the shell wall. The tubules are similar in orientation to aditicules within the same shells but are much smaller and denser, usually aligned along fine growth lines and arranged in crude longitudinal columns. Exceptionally preserved phosphatic molds of bundled setal canals inside epipunctae and aditicules, described for the first time in this paper, are direct evidence that these two types of tubular structures of different sizes had the same function of housing sensory setae along the shell margin, but both the setae and the tubules became abandoned in the outer portion of the shell wall through burial by the secondary shell layer when the shell margin migrated forward. Epipunctae have been found so far only in plaesionnyid shells, but aditicules are common in many groups of the order Orthida. The taxonomic value of epipunctae is shown by a reassessment of Pionorthis Schuchert and Cooper, 1932. The hypotype previously regarded widely, but erroneously, as the archetype of 'Orthis sola' Billings, 1866, the type species of Pionorthis, is allied to Plaesion vs Hall and Clarke, 1892. It bears the characteristic epipunctae. The holotype of Orthis sola is a dalmanelloid shell with true punctae, assignable to Mendacella Cooper. 1930. This warrants rejection of the genus Pionorthis.

语种英语
关键词[WOS]Stem Group Brachiopod ; Shell Structure ; Affinities ; Mickwitzia ; Micrina
WOS研究方向Paleontology
WOS类目Paleontology
WOS记录号WOS:000247855500004
出版者PALEONTOLOGICAL SOC INC
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/63
专题中国科学院南京地质古生物研究所
其他
通讯作者Jin, Jisuo
作者单位1.Univ Western Ontario, Dept Earth Sci, London, ON N6A 5B7, Canada
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
3.Laurentian Univ, Dept Earth Sci, Sudbury, ON P3E 2C6, Canada
推荐引用方式
GB/T 7714
Jin, Jisuo,Zhan, Renbin ,Copper, Paul,et al. Epipunctae and phosphatized setae in late ordovician plaesiomyid brachiopods from Anticosti Island, Eastern Canada[J]. JOURNAL OF PALEONTOLOGY,2007,81(4):666-683.
APA Jin, Jisuo,Zhan, Renbin ,Copper, Paul,&Caldwell, W. G. E..(2007).Epipunctae and phosphatized setae in late ordovician plaesiomyid brachiopods from Anticosti Island, Eastern Canada.JOURNAL OF PALEONTOLOGY,81(4),666-683.
MLA Jin, Jisuo,et al."Epipunctae and phosphatized setae in late ordovician plaesiomyid brachiopods from Anticosti Island, Eastern Canada".JOURNAL OF PALEONTOLOGY 81.4(2007):666-683.
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