globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.05.013
论文题名:
Vision in a Middle Ordovician trilobite eye
作者: Tanaka G.; Schoenemann B.; El Hariri K.; Ono T.; Clarkson E.; Maeda H.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 433
起始页码: 129
结束页码: 139
语种: 英语
英文关键词: Eye ; Functional morphology ; Palaeoecology ; Paleozoic ; Trilobite
英文摘要: Exceptionally well-preserved compound eyes of a Middle Ordovician trilobite, Cyclopyge sp., show remarkable detail, including each of the lenses and their distribution. Based on a new analysis using computed tomography and computer software, it has been established that the Cyclopyge sp. had an acute zone of enhanced visual acuity. The eye parameters (p) of the left eye of the specimen ranged from 0.02. μm. rad to 1.75. μm. rad (75th percentile. = 0.70. μm. rad) in the dorso-ventral direction and 0.26. μm. rad to 1.57. μm. rad (75th percentile. = 1.05. μm. rad) in the antero-posterior direction. These parameters indicated that the organism was adapted to strongly lit epipelagic conditions, which is comparable to adaptations exhibited by many present-day diurnal crustaceans. The results also suggest that this trilobite was not a diurnal migrant, because the eyes would have become inefficient under darker conditions. The lowest values of p were distributed in the ventral and posterior areas. This part of the eye was an acute zone with a wide field of view covering the lateral region, which indicated that the Cyclopyge sp. was probably not a predator. According to previous studies, early Middle Ordovician species inhabited the epipelagic as well as mesopelagic realms. From the viewpoint of the trilobite analysis, this study supports previous geological and palaeontological evidence that suggests that the epipelagic niche was invaded by at least the Middle Ordovician. © 2015 Elsevier B.V.
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被引频次[WOS]:5   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68899
Appears in Collections:过去全球变化的重建

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作者单位: Center for Marine Environment Studies, Kumamoto University, 6061 Matsushima-cho, Kami-amakusa, Kumamoto, Japan; University of Cologne, Departments of Biology Education (Zoology) and Neurobiology/Animal Physiology, Gronewaldstrasse 2, Köln, Germany; Université Cadi Ayyad, Département des Sciences de la Terre, Ave Abdelkrim Khattabi, B.P. 549, Marrakech, Morocco; 1552-141, Honden, Mizuho, Gifu, Japan; School of Geosciences, University of Edinburgh, Kings Buildings, West Mains Road, Edinburgh, Scotland, United Kingdom; Kyushu University Museum, Hakozaki 6-10-1, Higashi-ku, Fukuoka, Japan

Recommended Citation:
Tanaka G.,Schoenemann B.,El Hariri K.,et al. Vision in a Middle Ordovician trilobite eye[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,433
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