Tube Formation by <i>Pomatoceros Triqueter</i> (Polychaeta)

Hedley, R. H.

doi:10.1017/s0025315400023717

Cited by 44 publications

(28 citation statements)

References 4 publications

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“…2) Biomineralization -HUA et al (2005) found that Cloudina tubes do not show radial fibrous microstructure or palisade orientation of crystals, crystal nucleation and growth on a sheeted organic or inorganic substrate did not play a significant role in Cloudina skeletogenesis. They concluded that crystals were probably precipitated by skeleton-secreting organs and mixed with an organic matrix, what is similar to serpulids (HEDLEY, 1958;NEFF, 1971;NOTT & PARKER, 1975). However, standard granular secretion model of serpulids (HEDLEY, 1958;NEFF, 1971) has recently been cast in doubt by the discovery of complex oriented tube structure in Pomatoceros americanus ) on which the model of serpulid secretion was based.…”

Section: A Discussion Of Charactersmentioning

confidence: 99%

“…They concluded that crystals were probably precipitated by skeleton-secreting organs and mixed with an organic matrix, what is similar to serpulids (HEDLEY, 1958;NEFF, 1971;NOTT & PARKER, 1975). However, standard granular secretion model of serpulids (HEDLEY, 1958;NEFF, 1971) has recently been cast in doubt by the discovery of complex oriented tube structure in Pomatoceros americanus ) on which the model of serpulid secretion was based. 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.…”

Section: A Discussion Of Charactersmentioning

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: A Discussion Of Charactersmentioning

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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“…7H) or subdivided by septae inside ( fig. 8P), they are referred to as tubulae (Hedley, 1958: fig. 9; Jäger, 1983: 11, text- fig.…”

Section: Genus (Including Most Commonmentioning

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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“…This independence of taxonomic position is reflected in the widespread distribution of growth lines in living organisms. Forms with robust accretive skeletons, such as mollusks, corals, and brachiopods have received the most attention, but growth lines are prominent features in many others, including echinoderms (56,64), annelid worms (29,44), and even those aberrant arthropods, the barnacles (54). Vertebrates commonly fo rm growth lines on specialized skeletal elements, such as scales, otoliths, and teeth, and the higher plants are known for a variety of growth lines, including the familiar annual rings of trees.…”

Section: Taxonomic Distributionmentioning

confidence: 99%