Insights into the composition, morphology, and formation of the calcareous shell of the serpulid Hydroides dianthus

Tanur, Adrienne E.; Gunari, Nikhil; Sullan, Ruby May A.; Kavanagh, Christopher; Walker, Gilbert C.

doi:10.1016/j.jsb.2009.09.008

Cited by 76 publications

(76 citation statements)

References 81 publications

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“…Several other discoveries on the skeletal ultrastructures in serpulids contradict the traditional point of view on their biomineralization (VINN et al, 2008a(VINN et al, , 2008b(VINN et al, , 2008d. New evidence on the skeletal structures of serpulids suggests that serpulids were organic matrix-mediated biomineralizers similar to that of molluscs (VINN et al, 2008a(VINN et al, , 2008b(VINN et al, , 2008dTANUR et al, 2010). The biomineralization of sabellids (Fig.…”

Section: A Discussion Of Charactersmentioning

confidence: 99%

“…The calcareous tubes also occur in sabellid (Sabellidae) and cirratulid (Cirratulidae) polychaetes, since the Early Jurassic (JÄGER, 2004;VINN et al, 2008a) and the Oligocene respectively (FISCHER et al, 2000;. Recent discoveries on the skeletal structures and biomineralization of calcareous polychaetes (WEEDON, 1994;VINN, 2005VINN, , 2007VINN et al, 2008cVINN et al, , 2008aVINN et al, , 2008bVINN et al, , 2008dVINN et al, , 2009SANFILIPPO, 2009;VINN & MUTVEI, 2009;TANUR et al, 2010) allows us for the first time to make a complete comparison with the skeletal structures and skeletogenesis of problematic tubicolous fossils such as Cloudina.…”

Section: Introductionmentioning

confidence: 99%

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Inconsistencies in proposed annelid affinities of early biomineralized organism Cloudina (Ediacaran): structural and ontogenetic evidences

Vinn¹,

Zatoń²

2012

Carnets De Géologie (Notebooks on Geology)

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Cloudina, an important Ediacaran index fossil, is considered as one of the earliest biomineralizing organisms. Its biological affinities have not been fully resolved and phylogenetic links with both annelids and cnidarians have traditionally been suggested. Differences in tube morphology, ultrastructure and biomineralization suggest that Cloudina is not closely related to any recent skeletal annelid (e.g., serpulids, sabellids and cirratulids) and their skeletons are not homologous. The way of asexual reproduction in Cloudina resembles more that of cnidarians. The presence of a closed tube origin (base) in Cloudina is also compatible with the hypothesis of an animal of cnidarian grade.Key Words: Cloudina; Annelida; Serpulidae; Cnidaria; Ediacaran; biomineralization. Résumé : Incohérences dans les affinités supposées de l'organisme primitif biominéraliséCloudina (Ediacaran) avec les annélides : preuves relevant de la structure et du développe-ment ontogénétique.-Cloudina, un important fossile édiacarien, est considéré comme l'un des premiers organismes biomineralisés. Ses affinités biologiques n'ont pas encore été entièrement élucidées : des relations phylogénétiques avec les annélides et les cnidaires sont habituellement envisagées. Des différences dans la morphologie, l'ultrastructure et la biominéralisation du tube suggèrent que Cloudina ne puisse être étroitement apparentée à aucun squelette d'annélides actuelles, qu'il s'agisse de serpulidés, de sabellidés ou de cirratulidés ; leurs squelettes ne sont pas homologues. Le mode de reproduction asexuée de Cloudina ressemble davantage à celui des cnidaires. De plus, la configuration fermée de la partie initiale (proximale) du tube chez Cloudina est compatible avec l'hypothèse d'un animal de la catégorie des cnidaires.

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Section: A Discussion Of Charactersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inconsistencies in proposed annelid affinities of early biomineralized organism Cloudina (Ediacaran): structural and ontogenetic evidences

Vinn¹,

Zatoń²

2012

Carnets De Géologie (Notebooks on Geology)

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“…In keeping with Ragazzola et al (2012), all models were assumed to be composed of a linearly elastic, isotropic, homogeneous material with a Young's Modulus of 36 GPa and a Poisson ratio of 0.31 (properties of calcite; Tanur et al, 2010). Even though these material properties do not accurately represent the heterogeneities in the specimen and their material properties this approach gives a comparative insight into how different geometries affect the overall strength of a structure.…”

Section: Materials Propertiesmentioning

confidence: 99%

Potential and limitations of finite element modelling in assessing structural integrity of coralline algae under future global change

et al. 2015

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Abstract. Coralline algae are important habitat formers found on all rocky shores. While the impact of future ocean acidification on the physiological performance of the species has been well studied, little research has focused on potential changes in structural integrity in response to climate change. A previous study using 2-D Finite Element Analysis (FEA) suggested increased vulnerability to fracture (by wave action or boring) in algae grown under high CO 2 conditions. To assess how realistically 2-D simplified models represent structural performance, a series of increasingly biologically accurate 3-D FE models that represent different aspects of coralline algal growth were developed. Simplified geometric 3-D models of the genus Lithothamnion were compared to models created from computed tomography (CT) scan data of the same genus. The biologically accurate model and the simplified geometric model representing individual cells had similar average stresses and stress distributions, emphasising the importance of the cell walls in dissipating the stress throughout the structure. In contrast models without the accurate representation of the cell geometry resulted in larger stress and strain results. Our more complex 3-D model reiterated the potential of climate change to diminish the structural integrity of the organism. This suggests that under future environmental conditions the weakening of the coralline algal skeleton along with increased external pressures (wave and bioerosion) may negatively influence the ability for coralline algae to maintain a habitat able to sustain high levels of biodiversity.

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“…This organic component is represented by an inner organic membrane lining the lumen and an organic matrix inside the tube walls. The inner organic membrane is found in all serpulids (Nishi, 1993;Vinn, 2011) and may play an important role for the biomineralisation process (Tanur et al, 2010), but this needs further clarification (Vinn, 2011). The organic matrix of the tube wall should be preserved in fossil serpulid tubes, as it does in mollusc shells.…”

Section: Organic Component Of Tubes: Will Biochemistry Meet Paleontolmentioning

confidence: 99%

“…The tube matrix seems to be organised in thin sheets running parallel to accretion surfaces (Vinn et al, 2008b), but such organisation was observed only in some taxa within clade A (Vinn, 2013b). Tanur et al (2010) found that most of the soluble organic tube matrix of a Recent species Hydroides dianthus (Verill, 1873) is composed of carboxylated and sulfated polysaccharides, whereas proteins form a minor component. No data on other species are available and further studies are needed to determine usability and potential of this method for paleontology.…”

Section: Organic Component Of Tubes: Will Biochemistry Meet Paleontolmentioning

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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Insights into the composition, morphology, and formation of the calcareous shell of the serpulid Hydroides dianthus

Cited by 76 publications

References 81 publications

Inconsistencies in proposed annelid affinities of early biomineralized organism Cloudina (Ediacaran): structural and ontogenetic evidences

Inconsistencies in proposed annelid affinities of early biomineralized organism Cloudina (Ediacaran): structural and ontogenetic evidences

Potential and limitations of finite element modelling in assessing structural integrity of coralline algae under future global change

Written in stone: history of serpulid polychaetes through time

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