Les Hexactinellides(Lyssakides et Dictyonines) du Lias Marocain

Dresnay, Renaud du; Termier, Geneviève; Termier, Henri

doi:10.1016/s0016-6995(78)80032-1

Cited by 24 publications

(15 citation statements)

References 2 publications

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“…300 Ma). This is much older than, and therefore consistent with, assignment of Early Triassic (Rigby and Gosney 1983) and Early Jurassic (du Dresnay et al 1978) fossils to the Euplectellidae, although these interpretations have been questioned (Pisera and Bodzioch 1991).…”

Section: Resultssupporting

confidence: 79%

Molecular paleobiology of early-branching animals: integrating DNA and fossils elucidates the evolutionary history of hexactinellid sponges

et al. 2013

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Abstract.-Reconciliation of paleontological and molecular phylogenetic evidence holds great promise for a better understanding of the temporal succession of cladogenesis and character evolution, especially for taxa with a fragmentary fossil record and uncertain classification. In zoology, studies of this kind have largely been restricted to Bilateria. Hexactinellids (glass sponges) readily lend themselves to test such an approach for early-branching (non-bilaterian) animals: they have a long and rich fossil record, but for certain taxa paleontological evidence is still scarce or ambiguous. Furthermore, there is a lack of consensus for taxonomic interpretations, and discrepancies exist between neontological and paleontological classification systems. Using conservative fossil calibration constraints and the largest molecular phylogenetic data set assembled for this group, we infer divergence times of crown-group Hexactinellida in a Bayesian relaxed molecular clock framework. With some notable exceptions, our results are largely congruent with interpretations of the hexactinellid fossil record, but also indicate long periods of undocumented evolution for several groups. This study illustrates the potential of an integrated molecular/paleobiological approach to reconstructing the evolution of challenging groups of organisms.

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Section: Resultssupporting

confidence: 79%

Molecular paleobiology of early-branching animals: integrating DNA and fossils elucidates the evolutionary history of hexactinellid sponges

et al. 2013

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“…A few aspects of the taphonomy of non-rigid sponges have already been reported by Reitner and Neuweiler (1995), Flajs et al (1996), and from Paleozoic mud-mounds. Concerning Liassic faunas, studies on Moroccan carbonates by Dresnay et al (1978) and Neuweiler et al (2001a) have shown that lithified sponges were important benthic components in the colonization of the early central Atlantic Ocean. In addition, siliceous sponge faunas from the southern margin of the Tethys are known from Lower Jurassic limestone of the Trento Platform (Southern Alps, Italy).…”

Section: Sponge Taphonomymentioning

confidence: 99%

Sponge communities from the Lower Liassic of Adnet (Northern Calcareous Alps, Austria)

Delecat¹,

Reitner²

2005

Facies

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The lower slope of the drowned Alpine Adnet Reef was recolonized in Hettangian time by sponge communities of hexactinellid (hexactinosid and lyssacinosid) taxa and a few demosponges. Special taphonomic processes caused an excellent preservation of these sponges. The preservation allows to define several growth forms and to study original spicule configurations of the mainly non-rigid skeletons. Sponge faunas of presumably similar associations are known from adjacent basins, but only by isolated spicules of completely collapsed specimens. In Adnet the sponges are embedded in biodetrital limestones of the Schnöll Formation. Orientation and distribution of the sponges reflect autochthonous faunas that have been mixed with dislocated individuals by local water currents. The predominance of erect sponge types indicates intermediate sedimentation rates and/or occasional high-energy events. Sponge types and community structures are comparable with those ones from Middle Paleozoic mud mounds. Several hiatuses, mostly characterized by ferromanganese crusts have been kept free of sponge settlement. Carbon stable isotopes of the sponge-rich sequence show a small negative δ 13 C carb excursion that covers the period from Lower Hettangian to Lower Sinemurian.

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“…The studied mounds have been described in the Upper Sinemurian (Dubar, 1960(Dubar, -1962Du Dresnay et al, 1978), in the Upper Sinemurian--Carixian interval (Hauptmann, 1990;Poisson et al, 1998) and even in the Domerian-Toarcian transition zone (Warme et al, 1988). In the Foum Tillicht outcrop, the early small sized buildups are observed within the Idikel Formation, just above an Asteroceras-Arnioceras bearing bed at the Lower-Upper Sinemurian boundary (Fig.…”

Section: Stratigraphymentioning

confidence: 99%

The Sinemurian carbonate mud-mounds from central High Atlas (Morocco): stratigraphy, geometry, sedimentology and geodynamic patterns

Chafiki

Canérot

Souhel

et al. 2004

Journal of African Earth Sciences

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Les Hexactinellides(Lyssakides et Dictyonines) du Lias Marocain

Cited by 24 publications

References 2 publications

Molecular paleobiology of early-branching animals: integrating DNA and fossils elucidates the evolutionary history of hexactinellid sponges

Molecular paleobiology of early-branching animals: integrating DNA and fossils elucidates the evolutionary history of hexactinellid sponges

Sponge communities from the Lower Liassic of Adnet (Northern Calcareous Alps, Austria)

The Sinemurian carbonate mud-mounds from central High Atlas (Morocco): stratigraphy, geometry, sedimentology and geodynamic patterns

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