Early Ordovician black corals from China

Baliński, Andrzej; Sun, Yongqi

doi:10.3140/bull.geosci.1632

Cited by 4 publications

(3 citation statements)

References 21 publications

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Section: Discussionmentioning

confidence: 99%

“…Reconstructions of ancestral antipatharians can only be inferred from lineages of extant species and from the very limited fossil record of the group [ 57 , 58 ]. Two genera and three species of shallow water black coral fossils have been described from shelf depths during the Lower Ordovician (∼470 Ma) Fenxiang Formation of Hubei Province in southern China [ 57 , 58 ]. These fossil records were not included in our phylogenetic and bathymetric reconstructions because of morphological differences between the fossils and extant black corals, and uncertainty regarding whether the fossils represent lineages that share a direct common ancestor with present-day species [ 59 ].…”

Section: Discussionmentioning

confidence: 99%

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Bathymetric evolution of black corals through deep time

Horowitz,

Quattrini,

Brugler

et al. 2023

Proc. R. Soc. B.

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Deep-sea lineages are generally thought to arise from shallow-water ancestors, but this hypothesis is based on a relatively small number of taxonomic groups. Anthozoans, which include corals and sea anemones, are significant contributors to the faunal diversity of the deep sea, but the timing and mechanisms of their invasion into this biome remain elusive. Here, we reconstruct a fully resolved, time-calibrated phylogeny of 83 species in the order Antipatharia (black coral) to investigate their bathymetric evolutionary history. Our reconstruction indicates that extant black coral lineages first diversified in continental slope depths (∼250–3000 m) during the early Silurian (∼437 millions of years ago (Ma)) and subsequently radiated into, and diversified within, both continental shelf (less than 250 m) and abyssal (greater than 3000 m) habitats. Ancestral state reconstruction analysis suggests that the appearance of morphological features that enhanced the ability of black corals to acquire nutrients coincided with their invasion of novel depths. Our findings have important conservation implications for anthozoan lineages, as the loss of ‘source’ slope lineages could threaten millions of years of evolutionary history and confound future invasion events, thereby warranting protection.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Bathymetric evolution of black corals through deep time

Horowitz,

Quattrini,

Brugler

et al. 2023

Proc. R. Soc. B.

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“…The supposed soft parts are often preserved as weathered, pyritized remains of the organisms in three dimensions (Baliński et al 2014), but the original composition of the material is unclear. Others are phosphatized like the antipatharian coral remains (Baliński et al 2012, Baliński & Sun 2017 and phosphatic brachiopods in which the long pedicle is preserved in three dimensions in pyrite, now weathered to limonite (Baliński & Sun 2013). Maletz & Kozłowska (2013) described a small fauna of dendroid graptolites from the Fenxiang Biota, including Acanthograptus, Aspidograptus, Dendrograptus and Koremagraptus (Fig.…”

Section: Chengjiang (Cambrian)mentioning

confidence: 99%

Hemichordata (Enteropneusta & Pterobranchia, incl. Graptolithina): A review of their fossil preservation as organic material

Maletz¹

2020

Bull. Geosci.

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Fossil preservation has been discussed at length in nu merous publications, but still many details are unclear or have not been considered. It is usually discussed in relation to individual fossil groups (e.g. bacteria, brachiopods, graptolites, plants, trilobites, vertebrates) or types of fossil lagerstätten (cf. Seilacher 1970). In the Hemichordata, the preservation of the fossils is especially important, as the involved materials differ considerably between the two groups, the Enteropneusta (Fig. 1A) and the Pterobranchia (Fig. 1B-D).The results found in the fossil preservation are often interpreted from the visual aspects of the fossils only, and without consideration of the composition and reaction of the various materials involved in the decay processes and the subsequent fossilization processes over millions of years. Also a differentiation of originally preserved organic material and replacement of this due to later processes is often not considered. Briggs (2003) suggested replication of the morphology by rapid in situ growth of minerals as essential to preserve labile tissues, which means the loss of the original organic material through geological processes and replacement by secondarily formed minerals.Decayretardation during early biostratinomic proces ses may increase the potential for the preservation of fossils, not just in organically preserved material, but also in mineralic skeletons or shells. Important changes, however, modify the fossils considerably during later geological processes. To gain insight into the preservation of fossils it is necessary to consider the changes through these geological processes and to understand the various paths necessary to produce the final results, to see what happens to materials during numerous geological processes in Earth history. The fossilization of the Hemichordata may serve as a very important and useful example here.

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Proteinaceous corals as proxy archives of paleo-environmental change

Williams

2020

Earth-Science Reviews

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Early Ordovician black corals from China

Cited by 4 publications

References 21 publications

Bathymetric evolution of black corals through deep time

Bathymetric evolution of black corals through deep time

Hemichordata (Enteropneusta & Pterobranchia, incl. Graptolithina): A review of their fossil preservation as organic material

Proteinaceous corals as proxy archives of paleo-environmental change

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