Phosphatic fauna of the Early Cambrian Todd River Dolomite, Amadeus Basin, central Australia

Laurie, John R.

doi:10.1080/03115518608619151

Cited by 85 publications

(123 citation statements)

References 3 publications

(4 reference statements)

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“…These fossils have been interpreted as sclerites of larger scleritomes of problematic animals (Bengtson, 1970(Bengtson, , 2004Holmer et al 2008;Skovsted et al 2008Skovsted et al , 2009b. The taxonomy of tommotiids was discussed by Landing (1984Landing ( , 1995, Bengtson (1986), Laurie (1986), Bengtson et al (1990), Conway Morris & Chen (1990), Esakova & Zhegallo (1996) and Skovsted et al (2009a). Based on the organophosphatic shell composition and morphological similarities, tommotiids have been regarded as closely related to brachiopods (Williams & Holmer, 2002).…”

Section: F Tommotiidsmentioning

confidence: 99%

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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Section: F Tommotiidsmentioning

confidence: 99%

Chronology of early Cambrian biomineralization

et al. 2011

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“…figure 2a-d ). Only the pyramidal S1 sclerite has previously been described in the literature (Laurie 1986;Bengtson et al 1990). The pyramidal S1 sclerites are high, and have a rectangular or trapezoidal cross section.…”

Section: Description Of Paterimitra (A) Isolated Scleritesmentioning

confidence: 99%

“…Paterimitra is perhaps one of the least-known tommotiids, with a total of less than 30 specimens of a single, bilaterally symmetrical sclerite described from a small number of localities in South and Central Australia (Laurie 1986;Bengtson et al 1990;Gravestock et al 2001). In this paper, we show that sclerites of Paterimitra are, in fact, common constituents of the Early Cambrian fauna with specimens recovered from virtually every sampled section through the Wilkawillina, Wirrapowie and Ajax limestones throughout the Arrowie Basin of South Australia.…”

Section: Introductionmentioning

confidence: 99%

The scleritome ofPaterimitra: an Early Cambrian stem group brachiopod from South Australia

et al. 2009

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Early Cambrian tommotiids are problematic fossil metazoans with external organophosphatic sclerites that have been considered to be basal members of the lophophorate stem group. Tommotiids are almost exclusively known from isolated or rarely fused individual sclerites, which made previous reconstructions of the actual organism highly conjectural. However, the recent discovery of the first articulated specimens of the tommotiid Eccentrotheca revealed a tubular sclerite arrangement (scleritome) that limited the possible life habit to sessile filter feeding and thus further supported a lophophorate affinity. Here, we report the first articulated specimens of a second tommotiid taxon, Paterimitra from the Early Cambrian of the Arrowie Basin, South Australia. Articulated specimens of Paterimitra are composed of two bilaterally symmetrical sclerite types and an unresolved number of small, asymmetrical and irregular crescent-shaped sclerites that attached to the anterior margin of the symmetrical sclerites. Together, the sclerites form an open cone in which the symmetrical sclerites are joined together and form a small posterior opening near the base of the scleritome, while the irregular crescent-shaped sclerites defined a broad anterior opening. The coniform scleritome of Paterimitra is interpreted to have attached to hard substrates via a pedicle that emerged through the small posterior opening (sometimes forming a tube) and was probably a sessile filter feeder. The scleritome of Paterimitra can be derived from the tubular scleritome of Eccentrotheca by modification of basal sclerites and reduction in tube height, and probably represents a more derived member of the brachiopod stem group with the paired symmetrical sclerites possibly homologous to brachiopod valves.

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“…The same applies to the sclerites of E. kanesia Landing et al, 1980 from the Terreneuvian of Avalonia (Landing et al 1980;Landing 1988Landing , 1991Landing , 1995 and the related tommotiid Kulparina Conway Morris in Bengtson et al, 1990 from South Australia which are also known to have had a tubular scleritome (Skovsted et al 2011(Skovsted et al , 2015b. Paterimitra Laurie, 1986 from South Australia may include sclerites of similar size as in the Greenland specimens, but these exhibit characteristic pyramidal morphologies not obvious in the Greenland material.…”

Section: Interpretation and Identificationmentioning

confidence: 97%

A silicified tommotiid from the lower Cambrian of Greenland

Skovsted¹

2016

Bull. Geosci.

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Phosphatic fauna of the Early Cambrian Todd River Dolomite, Amadeus Basin, central Australia

Cited by 85 publications

References 3 publications

Chronology of early Cambrian biomineralization

Chronology of early Cambrian biomineralization

The scleritome ofPaterimitra: an Early Cambrian stem group brachiopod from South Australia

A silicified tommotiid from the lower Cambrian of Greenland

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