Pulsed cephalopod diversification during the Ordovician

Kröger, Björn; Zhang, Yunbai

doi:10.1016/j.palaeo.2008.12.015

Cited by 33 publications

(28 citation statements)

References 40 publications

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“…According to this concept, straight‐shelled cephalopods of the order Orthocerida, previously placed within the Nautiloidea, are excluded from nautiloids and placed in a separate subclass, Orthoceratoidea. Consequently, the nautiloids comprise cephalopods with similar general morphology, embryonic development and ontogeny as the Recent genus Nautilus , whereby we use the term ‘nautiloids’ to have the usual meaning in relation to palaeobiological studies and examination of long‐term evolutionary trends (see Manda 2008; Kröger and Zhang 2009; Manda and Turek 2009 b ).…”

Section: Terminology and Materialsmentioning

confidence: 99%

Late Emsian Rutoceratoidea (Nautiloidea) from the Prague Basin, Czech Republic: morphology, diversity and palaeoecology

Manda

Turek

2011

Palaeontology

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Nautiloids of the superfamily Rutoceratoidea from the late Emsian (late Early Devonian) of the Prague Basin (Czech Republic) are commented upon. Species recognized include the hercoceratids Hercoceras mirum, H.? transiens, Ptenoceras proximum, P. nudum, P. minusculum and Anomaloceras anomalum, as well as the rutoceratids Adelphoceras bohemicum, Homoadelphoceras devonicans, Pseudorutoceras bolli and Goldringia? devonicans. In addition, four new species are described: Parauloceras regulare sp. nov., Roussanoffoceras chlupaci sp. nov., Otomaroceras sp. nov. and Goldringia sp. nov. Morphology and distribution patterns of Pragian and late Emsian rutoceratoid faunas from the Prague Basin are compared. They show that an increased diversity was accompanied by a higher level of specialization of rutoceratoids, which manifested itself in low abundance, increased facies dependence and greater variation in shell size during the Early Devonian. The evolution of sculpture and a contracted aperture, both regarded as protective adaptive features, was also examined, but no adaptive trend towards more pronounced sculpture and constriction of the aperture was found to have occurred in the Early Devonian. A more distinctive sculpture was, however, observed in shallow-water assemblages of P. proximum in comparison with deeper-water faunules, and two additional cephalopod species were examined in order to obtain comparative data. The presence of distinct sculpture patterns in coeval shallowand deeper-water assemblages suggests limited migration between them and consequently reflects some degree of territoriality in Devonian nautiloids. New data on early shell development in P. proximum are presented. During the Choteč Event, rutoceratoid generic diversity dropped dramatically, one family became extinct and the Early Devonian diversification of the group came to an end. The recovery of nautiloid faunas was slower than that of other cephalopods and associated, unrelated invertebrates. The absence of change in abundance patterns between Pragian and late Emsian rutoceratoid faunas, i.e. prior to and subsequent to ammonoid radiation, suggests that the appearance and radiation of the latter group in the early Emsian did not affect the structure of nautiloid assemblages, i.e. these two clades did not occupy the same niches.

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Section: Terminology and Materialsmentioning

confidence: 99%

Late Emsian Rutoceratoidea (Nautiloidea) from the Prague Basin, Czech Republic: morphology, diversity and palaeoecology

Manda

Turek

2011

Palaeontology

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“…An intensive study of the Ordovician fossils in regions like South China and Baltoscandia, which have nearly complete successions and well studied depositional facies, is of particular significance for an evaluation of the biogeographic distribution and evolutionary patterns of organisms across environmental gradients. In South China, there have been some studies on the diversity history of some specific fossil groups, such as trilobites [5], brachiopods [6], graptolites [2,3,7,8], bivalves [9], nautiloids [10], and acritarchs [11], which have revealed their basic evolutionary patterns. The results of our graptolite diversity study indicate that a remarkable difference in diversity history exists between the two major South China regions with distinct geological backgrounds, the Yangtze Region and the Jiangnan Region [3].…”

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confidence: 99%

Diversity and paleobiogeographic distribution patterns of early and Middle Ordovician graptolites in distinct depositional environments of South China

Zhang

Chen

Goldman

et al. 2010

Sci. China Earth Sci.

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“…), a critical interval for the GOBE in South China, for example trilobites (Zhou et al . ) and nautiloids (Kröger & Zhang ). Besides, the MDICE and GICE excursions of carbonate δ 13 C were recognized within the lower to middle Kuniutan Formation and Datianba to Pagoda Formation, respectively (Gong et al .…”

Section: Discussionmentioning

confidence: 99%

Middle-Late Ordovician iron-rich nodules on Yangtze Platform, South China, and their palaeoenvironmental implications

Luan

Brett

Zhan

et al. 2018

LET

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Iron‐rich nodules occur on the Yangtze Platform, South China, especially along the marginal area, during the late Middle and early Late Ordovician (Darriwilian–Sandbian). Based on the study of samples from the Daling section, Anhui Province, these nodules include: (1) oncoids; (2) coated bioclasts; and (3) coated micritic intraclasts, all of which potentially have a similar biological origin. The nodule‐bearing strata were deposited in a midouter ramp setting, indicating sediment starvation and open marine conditions, possibly combined with anoxia in deeper basinal areas and cool water upwelling during the formation of the nodules, rather than terrestrial input or local tectonic movement. The widespread distribution of iron‐rich nodules at this time was probably favoured by high sea level and cooling climate, conditions that simultaneously favoured the evolutionary radiations of the GOBE in South China. Thus, these nodules form a time‐specific signature of a critical time in the evolution of the marine ecosystem in the context of local environmental background along the marginal Yangtze Platform.

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Pulsed cephalopod diversification during the Ordovician

Cited by 33 publications

References 40 publications

Late Emsian Rutoceratoidea (Nautiloidea) from the Prague Basin, Czech Republic: morphology, diversity and palaeoecology

Late Emsian Rutoceratoidea (Nautiloidea) from the Prague Basin, Czech Republic: morphology, diversity and palaeoecology

Diversity and paleobiogeographic distribution patterns of early and Middle Ordovician graptolites in distinct depositional environments of South China

Middle-Late Ordovician iron-rich nodules on Yangtze Platform, South China, and their palaeoenvironmental implications

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