KMS Nanjing Institute of Geology and Palaeonotology,CAS
Leperditicopid arthropods (Ordovician-Late Devonian): Functional morphology and ecological range | |
Vannier, J; Wang, SQ (王尚启); Coen, M | |
2001 | |
发表期刊 | JOURNAL OF PALEONTOLOGY |
ISSN | 0022-3360 |
卷号 | 75期号:1页码:75-95 |
摘要 | The functional morphology and autecology of leperditicopid arthropods (Ordovician-uppermost Devonian) are analyzed in the light of well-preserved specimens from the Devonian of China and detailed comparisons with recent ostracudes. Leperditicopids were large. bivalved arthropods (adults ranging from 5 to about 50 mm in length) typically with an asymmetric carapace (strong ventral overlap). a complex muscular system (powerful adductors. extrinsic muscles, tendinous structures) whose insertions are preserved as scars on the inner surface of the exoskeleton and strinkerns. and an extensive radiating network of integumental sinuses probably involved in gaseous and ionic exchanges (oxygen uptake and transport. osmoregulation). The conspicuous chevron scars adjacent to the adductor scars are interpreted as the anchoring spots of mandibular tendinous structures possibly involved in the opening mechanism of the valves. The ultrastructure of the carapace is comparable to that of thick-shelled recent myodocopid ostracodes. A review of leperditicopid occurences (depositional environment, associated faunas and floras) shows that the group preferentially occupied very shallow marginal habitats (tidal hats, reef-hats. lagoons, embayments, or estuarian complexes) that were subjected tb environmental stress (salinity. temperature. moisture). This ecological range implies specific adaptations (osmoregulation, resistance to desiccation) supported by morphological evidence (e.g.. circulatory system. carapace closing system. thick shell). Most leperditicopids had epibenthic lifestyles and were probably detritus feeders. They may have been adapted (powerful mandibles) to scrape food on algal/microbial mars. Their typical pattern or occurrence (monospecificity. large numerical abundance) displays some of the characteristics of upper tunistic populations (e.g.. recent ostracodes. branchiopods) living in variable environments. Morphological similarities with Ostracoda are important (e.g., muscular and tendinous Features. circulatory system, valve overlap, carapace ultrastructure) but taxonomic relationships with that group remain inconclusive because of the lack of evidence from soft parts. |
语种 | 英语 |
关键词[WOS] | New-york ; Ostracodes ; Myodocopida ; Behavior |
WOS研究方向 | Paleontology |
WOS类目 | Paleontology |
WOS记录号 | WOS:000166859400007 |
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/332004/791 |
专题 | 中国科学院南京地质古生物研究所 |
通讯作者 | Vannier, J |
作者单位 | 1.Univ Lyon 1, CNRS, FRE 2158, UFR Sci Terre, F-69622 Villeurbanne, France 2.Nanjing Univ, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 3.Catholic Univ Louvain, Inst Geol, FNRS, B-1348 Louvain, Belgium |
推荐引用方式 GB/T 7714 | Vannier, J,Wang, SQ ,Coen, M. Leperditicopid arthropods (Ordovician-Late Devonian): Functional morphology and ecological range[J]. JOURNAL OF PALEONTOLOGY,2001,75(1):75-95. |
APA | Vannier, J,Wang, SQ ,&Coen, M.(2001).Leperditicopid arthropods (Ordovician-Late Devonian): Functional morphology and ecological range.JOURNAL OF PALEONTOLOGY,75(1),75-95. |
MLA | Vannier, J,et al."Leperditicopid arthropods (Ordovician-Late Devonian): Functional morphology and ecological range".JOURNAL OF PALEONTOLOGY 75.1(2001):75-95. |
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