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标题：New Late Jurassic symmetrical hermit crabs from the southern Polish Uplands and early paguroid diversification
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作者：RENÉ H.B. FRAAIJE ; WIESŁAW KRZEMIŃSKI ; BARRY W.M. VAN BAKEL 等
期刊名称：Acta Palaeontologica Polonica
印刷版ISSN：0567-7920
电子版ISSN：1732-2421
出版年度：2014
卷号：59
期号：3
页码：681-688
DOI：10.4202/app.2012.0022
语种：English
出版社：Institute of Paleobiology PAS
摘要：On the basis of carapaces, three new genera and species of symmetrical paguroid anomurans are described. Diogenicheles theodorae, Masticacheles longirostris, and Pilgrimcheles karolinae constitute the oldest known members of the family Parapylochelidae. As noted previously, assemblages from sponge-reefal strata of Oxfordian (Late Jurassic) age in the southern Polish Uplands document an important radiation event amongst paguroids. Compared to the present day, the Parapylochelidae were more diverse during the mid-Mesozoic; they appear to have withdrawn from shallow, reefal waters to deep-water settings from the Late Jurassic onwards. Paguroid faunas from the Oxfordian of Europe already are highly diverse, both morphologically and phylogenetically, and comprise early members of the families Diogenidae, Pylochelidae, and Parapylochelidae. This suggests that the evolutionary history of paguroids started much earlier (i.e., in pre-Jurassic times) than previously assumed. New terms for several typical paguroid carapace regions are introduced and on the basis of carapace morphology and ecological shifts hypotheses on the early speciation of hermit crabs are put forward.
关键词：Anomura;Paguroidea;Parapylochelidae;carapace morphology;evolution;Oxfordian;Jurassic;Poland