| DOI: | 10.1016/j.palaeo.2015.12.027
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| 论文题名: | Detecting comatulid crinoid cryptic species in the fossil record |
| 作者: | Purens K.J.S.
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| 刊名: | Palaeogeography, Palaeoclimatology, Palaeoecology
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| ISSN: | 0031-0182
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| 出版年: | 2016
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| 卷: | 446 | | 起始页码: | 195
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| 结束页码: | 204
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| 语种: | 英语
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| 英文关键词: | Comatulid crinoid
; Cryptic species
; Disparity
; Finite mixture models
; Geometric morphometrics
; Taxonomic bias
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| 英文摘要: | This work assesses the impact that taxonomic bias may exert on the richness history of the comatulid crinoids. While neontologists can use a whole organism for taxonomic description, paleontologists focus on only one element, the centrodorsal-the element most often described for fossil comatulids. With complete specimens available, one might expect that neontologists are able to discriminate more species, resulting in a bias that would result in a lower apparent richness of fossil versus extant crinoids. However, neontologists generally do not use many of the centrodorsal characters available for taxonomic description that are exploited by paleontologists. Potentially, this would bias upwards richness of fossil relative to extant crinoids, provided centrodorsals are a rich source of information. In this study, centrodorsal shape of Recent and fossil comatulid species was measured using quantitative methods that can be applied uniformly to both groups. Two different methods applied to centrodorsal shape-disparity and finite mixture modeling-reveal no obvious bias of over- or under-splitting of Recent versus fossil comatulid species. Interestingly, the methods identified high richness within a putative extant species complex, supported with molecular data. Lacking evidence of taxonomic bias influencing the richness record of fossil comatulids, sampling and preservation are the likely sources of bias producing the 10-fold higher richness of extant over fossil comatulids. © 2015 Elsevier B.V. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/68547
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | University of Michigan, Museum of Paleontology, 1109 Geddes Avenue, Ann Arbor, MI, United States
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| Recommended Citation: | |
Purens K.J.S.. Detecting comatulid crinoid cryptic species in the fossil record[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,446
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