New Finds of Skeletal Fossils in the Terminal Neoproterozoic of the Siberian Platform and Spain

Zhuravlev, Andrey Yu.; Liñán, Eladio; Vintaned, José Antonio Gámez; Debrenne, Françoise; Fedorov, Aleksandr B.

doi:10.4202/app.2010.0074

Cited by 95 publications

(96 citation statements)

References 86 publications

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“…5A) suggest that Cloudina is not closely related to any Recent calcareous polychaetes (serpulids, sabellids or cirratulids) (Vinn and Zatoń, 2012a). The type of asexual reproduction and presence of a closed tube base in Cloudina is more compatible with the hypothesis of an animal of cnidarian grade (Hua et al, 2005;Vinn and Zatoń, 2012a;Zhuravlev et al, 2012).…”

Section: False Serpulids: Tubular Fossils Below the Precambriancambrisupporting

confidence: 64%

Written in stone: history of serpulid polychaetes through time

et al. 2014

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Ippolitov, A.P., Vinn, O., Kupriyanova, E.K. and Jäger, M. 2014. Written in stone: history of serpulid polychaetes through time. Memoirs of Museum Victoria 71: 123-159.Although the fossil record of annelids in general is poor, calcareous tube-building Serpulidae are a notable exception. The "stumbling block" of understanding the serpulid fossil record is obtaining reliable taxonomic interpretations of fossil tubes based on morphology. Luckily, serpulid tubes demonstrate high variety of ultrastructures and nonuniform mineralogical composition, which can be used as new tools for decrypting the fossil record. Ancient Late Ediacaran (580-541 Ma) and Paleozoic (541-252 Ma) rocks contain diverse tubicolous fossils that have often been erroneously interpreted as annelids, and serpulids, in particular. Palaeozoic to Middle Jurassic coiled spirorbiform tubes, often referred to as Spirorbis, had been shown to be microconchids, a group of probable lophophorate affinity. The most ancient records of unequivocal serpulids date back to the Middle Triassic (~244 Ma) of the Mesozoic, and from the Earliest Jurassic (~200 Ma) fossil serpulids become common. From the latest Jurassic (~146 Ma) serpulids colonised hydrocarbon seep environments and possibly also penetrated the deep sea. Concerted efforts of paleontologists and zoologists are needed for further understanding of serpulid evolutionary history. The serpulid fossil record can become a valuable instrument for calibration of "molecular clocks" in polychaetes, which would allow dating not only divergence events in serpulids, but also in annelid groups that lack a representative fossil record.

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Section: False Serpulids: Tubular Fossils Below the Precambriancambrisupporting

confidence: 64%

Written in stone: history of serpulid polychaetes through time

et al. 2014

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“…Fedonkin & Waggoner, 1997). On the other hand, Ediacara-type fossils have repeatedly been reported from the Early Palaeozoic (Conway Morris, 1993;Jensen, Gehling & Droser, 1998;Samuelson, Van Roy & Vecoli, 2001;Zhang & Babcock, 2001), but none of those is comparable with typical Ediacaran vendobionts in their structure, symmetry and growth pattern (Antcliffe & Brasier, 2008;Zhuravlev et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Identification of fossils reported as single rays of Chancelloria sp. from the Anabarites trisulcatus and basal Purella zones of the Nemakit-Daldynian Stage of the southeastern Siberian Platform Khomentovsky & Karlova, 2005;Brasier, Khomentovsky & Corfield, 1993) is questionable (Zhuravlev et al 2011). Likewise, the occurrence of Chancelloriidae in SSF1 of South China (Qian & Bengtson, 1989) has not been confirmed (M. Steiner, unpub.…”

Section: D Molluscs Hyoliths Halwaxiids and Chancelloriidsmentioning

confidence: 99%

“…2). Their lowermost occurrence is documented from the Nama Group in Namibia (Germs, 1972;Grant, 1990) and coincides with a pronounced positive carbon excursion reaching 8 ‰ and dated 548.8 ± 1 Ma (Grotzinger et al 1995;Grotzinger, Watters & Knoll, 2000;Condon et al 2005;Grotzinger, Adams & Schröder, 2005;Zhuravlev et al 2011). Namapoikia rietoogensis Wood, Grotzinger & Dixon, 2002 (a calcareous, probably aragonitic, modular form with a robust biomineralized but aspicular skeleton) is of uncertain affinity to sponges or cnidarians and occurs in the Nama Group of Namibia (Wood, Grotzinger & Dixon, 2002) in the uppermost Ediacaran beds of the same estimated age.…”

Section: B1 Ediacaran Calcified Cnidariomorphsmentioning

confidence: 99%

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Chronology of early Cambrian biomineralization

et al. 2011

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-Data on the first appearances of major animal groups with mineralized skeletons on the Siberian Platform and worldwide are revised and summarized herein with references to an improved carbon isotope stratigraphy and radiometric dating in order to reconstruct the Cambrian radiation (popularly known as the 'Cambrian explosion') with a higher precision and provide a basis for the definition of Cambrian Stages 2 to 4. The Lophotrochozoa and, probably, Chaetognatha were first among protostomians to achieve biomineralization during the Terreneuvian Epoch, mainly the Fortunian Age. Fast evolutionary radiation within the Lophotrochozoa was followed by radiation of the sclerotized and biomineralized Ecdysozoa during Stage 3. The first mineralized skeletons of the Deuterostomia, represented by echinoderms, appeared in the middle of Cambrian Stage 3. The fossil record of sponges and cnidarians suggests that they acquired biomineralized skeletons in the late Neoproterozoic, but diversification of both definite sponges and cnidarians was in parallel to that of bilaterians. The distribution of calcium carbonate skeletal mineralogies from the upper Ediacaran to lower Cambrian reflects fluctuations in the global ocean chemistry and shows that the Cambrian radiation occurred mainly during a time of aragonite and high-magnesium calcite seas.

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“…This revolution was mainly concentrated in the Ediacaran-Cambrian transition, whose fossil record in central Spain is not very abundant but quite diverse, containing stromatolites, trace fossils, soft-bodied organisms (vendotaenids, sabelliditids, acritarchs, possible Beltanelliformis), and early skeletal fossils (Cloudina, Sinotubulites, Cambrian "small shelly fauna", archaeocyathans, early trilobites…) (Liñán & Palacios, 1987;Vidal et al, 1994;Liñán et al, 2004;Fernández-Remolar & García-Hidalgo, 2005;Jensen et al, 2007;Zhuravlev et al, 2012;Jensen & Palacios, 2016). In the Central Iberian Zone (CIZ), the Ediacaran-Cambrian transition is recorded in several rock units which have received different names depending on the region and author (Nozal Martín et al, 1988;Vidal et al, 1994;Pieren Pidal, 2000).…”

Section: Introductionmentioning

confidence: 99%

Pistas fósiles y dubiofósiles del Ediacárico y Cámbrico del Anticlinal de Alcudia, España

Simón¹

2017

Estud. geol.

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The fossil record of the Ediacaran-Cambrian transition in Spain provides potentially useful information to understand this critical episode in the history of life on Earth. In the present work, new findings of trace fossils and dubiofossils are described from the upper Ediacaran and lowermost Cambrian of the Alcudian unit in the Alcudia Anticline, at the southern margin of the Central Iberian Zone (valle de Alcudia, Iberian Massif, Spain). Two new trace fossil sites are described from the Upper Alcudian subunit and assigned to the Fortunian stage (lower Cambrian, Terreneuvian series) and to the regional Lower Corduban substage. They contain examples of arthropod-like scratches (Monomorphichnus lineatus), small bilobed trails (similar to Archaeonassa), an inclined burrow with spreite (may be a teichichnid), and long unbranched burrows with very fine transversal structure (probably the ventral surface of Psammichnites). Torrowangea aff. rosei and possible body fossils of late Ediacaran age are described from the Lower Alcudian subunit, including a disc resembling a frond holdfast and a diamond-shaped complex structure with no known equivalents.

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New Finds of Skeletal Fossils in the Terminal Neoproterozoic of the Siberian Platform and Spain

Abstract: A current paradigm accepts the presence of weakly biomineralized animals only, barely above a low metazoan grade of organization in the terminal

Cited by 95 publications

References 86 publications

Written in stone: history of serpulid polychaetes through time

Written in stone: history of serpulid polychaetes through time

Chronology of early Cambrian biomineralization

Pistas fósiles y dubiofósiles del Ediacárico y Cámbrico del Anticlinal de Alcudia, España

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