Encrusting strategies in a Cambrian nonreefal epibenthic community

Clausen, Sébastien; Álvaro, J. Javier

doi:10.2113/173.6.553

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…Dalvé, 1948;Clausen and Álvaro, 2002) and continued by Devonian (e.g. Sandberger and Sandberger, 1856) records, show the presence of unequivocal serpulid tube characters (such as, for example, a median keel or tubules).…”

Section: Paleozoic (541-252 Ma) Tubular Problematic Taxamentioning

confidence: 99%

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: Paleozoic (541-252 Ma) Tubular Problematic Taxamentioning

confidence: 99%

Written in stone: history of serpulid polychaetes through time

et al. 2014

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“…Dalvé 1948;Clausen & Álvaro 2002), but none of these records show the presence of unequivocal serpulid or calcareous polychaete skeletal characters (Weedon 1990(Weedon , 1991(Weedon , 1994ten Hove & van den Hurk 1993;Vinn & Mutvei 2005;Vinn 2005aVinn , 2005cVinn , 2006bVinn & Furrer 2008;Vinn et al 2008aVinn et al , 2008bVinn et al , 2008cVinn et al , 2008d. Therefore most likely these fossils belong to various Palaeozoic tubicolous problematica.…”

Section: Introductionmentioning

confidence: 99%

Calcareous tubeworms of the Phanerozoic

Vinn¹,

Mutvei²

2009

Estonian J. Earth Sci.

122

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Morphological similarities indicate that Palaeozoic problematic tubeworms, e.g. tentaculitids, cornulitids, microconchids, trypanoporids, Anticalyptraea, and Tymbochoos, form a monophyletic group. This group may also include hederelloids. Members of this group share affinities with lophophorates and their evolution could have partly been driven by predation. The extinction of Palaeozoic tubeworms in the Middle Jurassic was possibly at least partly caused by the ecological pressure by serpulid and sabellid polychaetes. The input of Palaeozoic tubeworms to the general ocean biocalcification system may have been smaller in the Ordovician to Jurassic than that of calcareous polychaetes in the Late Triassic to Recent. There seems to have been some correlation between the aragonite-calcite seas and the skeletal mineralogy of Triassic-Recent polychaete tubeworms.

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“…High-energy disturbance of the seafloor caused extensive winnowing, providing a firm, shelly or hard substrate necessary for the attachment of encrusting epibenthos, such as agglutinated foraminifera (psammosphaerids) and polychaeta tubes (serpulids; Clausen & Álvaro 2002). This community contained neither echinoderm holdfasts nor other encrusting organisms.…”

Section: Discussion: Palaeoecological Implicationsmentioning

confidence: 99%

New Early Cambrian eocrinoids from the Iberian Chains (NE Spain) and their role in nonreefal benthic communities

Clausen

2004

Eclogae geol. Helv.

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The Early Cambrian echinoderm-sponge meadows, which colonized shallow carbonate-siliciclastic platforms, have received relatively little study despite their widespread occurrence in several regions of Gondwana. Their taxa are generally preserved disarticulated, reworked and deposited through the action of waves and storms. Silicified echinoderm-rich packstones from the uppermost Bilbilian limestones (latest Early Cambrian in age) of the Valdemiedes Formation (Iberian Chains, NE Spain) formed through growth and destruction of echinoderm-sponge colonies by storm-wave action. This fauna has been studied in thin section and after etching by acetic acid. Eocrinoid remains include the thecal basal-ossicle of Rhopalocystis? mesonesensis n. sp. and other indeterminate species. Echinoderm columnals, visible in thin section, are associated with sponge spicules, trilobites, calcite-and phosphate-shelled brachiopods, chancelloriid sclerites, and foraminiferans. This finding suggests that stemmed eocrinoids were already present on the western Gondwana margin at the end of the Early Cambrian. RESUMEMalgré leur large distribution dans plusieurs régions du Gondwana, les colonies à échinodermes et éponges du Cambrien inférieur qui colonisèrent les plates-formes peu profondes en régime sédimentaire mixte demeurent relativement peu étudiées. Leur taxa sont généralement préservés désarticulés et remaniés au sein de dépôts hydrodynamiques sous l'influence des vagues et tempêtes. Des packstones silicifiés à échinodermes du Bilbilien terminal (fin du Cambrien inférieur) de la Formation de Valdemiedes (Chaînes Ibériques, Nord-Est de l'Espagne) ont été étudiés en lames minces et par dissolution à l'acide acétique. Ces bancs calcaires furent formés par la destruction répétée de colonies à éponges et échinodermes par l'action commune des vagues et tempêtes. Les restes d'éocrinoïdes extraits incluent la pièce basale de la thèque de Rhopalocystis? mesonesensis n. sp., ainsi que d'autres espèces indéter-minées. Des columnales d'échinodermes sont également visibles en lames minces. Ces fossiles sont associés à des spicules d'éponges, des trilobites, des brachiopodes à valves calcaires et phosphatées, des sclérites de chancelloriides et des foraminifères. Cette étude suggère que les échinodermes à tige étaient présents sur la marge occidentale du Gondwana dès la fin du Cambrien inférieur.

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Encrusting strategies in a Cambrian nonreefal epibenthic community

Cited by 10 publications

References 6 publications

Written in stone: history of serpulid polychaetes through time

Written in stone: history of serpulid polychaetes through time

Calcareous tubeworms of the Phanerozoic

New Early Cambrian eocrinoids from the Iberian Chains (NE Spain) and their role in nonreefal benthic communities

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