Two New Genera of Early Silurian Stricklandioid Brachiopods From South China and Their Bearing on Stricklandioid Classification and Paleobiogeography

Jiayu, Rong; Jin, Jisuo; Zhan, Ruifen

doi:10.1666/0022-3360(2005)079[1143:tngoes]2.0.co;2

Cited by 12 publications

(13 citation statements)

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“…In contrast to the early Telychian diversity trough, the faunas of the two Silurian peaks contain diverse and abundant brachiopods, associated with corals, trilobites, nautiloids and other taxa. There is a strong provincial character to these shelly faunas, particularly among pentamerid brachiopods (Rong et al 2005) and corals (JQ ) in the Aeronian. The 'Xiushan Fauna', occurring in the middle-upper Telychian mudstones in the upper and lower Yangtze Region is represented by the Salopinella-Sichuanoceras-Stomatograptus sinensis-Coronocephalus fauna occupying a shallow-water regime (BA2-3).…”

Section: Early Silurian (Mid-late Llandovery)mentioning

confidence: 99%

Dynamic patterns of latest Proterozoic‐Palaeozoic‐early Mesozoic marine biodiversity in South China

et al. 2007

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Analyses of global biodiversity curves have been important for the interpretation of co-evolution between organisms and environments through geological time. Global curves can be better understood if all the data collected from a multitude of palaeocontinents are analysed and explained separately. South China is a major block possessing more advantages for regional research than any of the other blocks in China. There exists a well-developed succession of marine strata from the Ediacaran through to the Triassic with a relatively high resolution of bio-and chrono-stratigraphy and an extensive marine fossil record. Stratigraphic occurrences of 5685 genera and 1386 families within 32 phyla or subphyla plus groups with uncertain affinities from this interval have been compiled by a large team of palaeontologists. With the exception of the Ediacaran, 50 time intervals with an average duration of 6.8 Ma are investigated. Diversity curves constructed at the levels of genus, family and order indicate that marine biodiversity peaked six times within the intervals: (1) Early Cambrian explosive radiation, (2) Early-Mid Ordovician radiation mainly of the Paleozoic Evolutionary Fauna, (3) Early Silurian radiation, (4) late Early-Mid Devonian radiation, (5) Mid-Late Permian radiation and (6) Mid Triassic radiation chiefly of the Modern Evolutionary Fauna. Drops in biodiversity are controlled by various factors: (1) global catastrophes, which produced rapid losses of biodiversity during short time intervals; (2) global environmental perturbations with long term effects, as in the Carboniferous; (3) regional tectonics and palaeogeographical constraints, resulting in a lack of marine sedimentary rocks in many areas with biodiversity declining, as in the Wenlock; (4) unique sedimentary facies in large areas resulting in biodiversity losses, as in the Late Cambrian and (5) artifactual constraints associated with a lack of fossil record or low research intensity for some intervals, as in the period of about 30 Ma following the Early Cambrian explosive radiation.

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Section: Early Silurian (Mid-late Llandovery)mentioning

confidence: 99%

Dynamic patterns of latest Proterozoic‐Palaeozoic‐early Mesozoic marine biodiversity in South China

et al. 2007

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“…The sample was extracted from a single shell bed within an area of approximately 1·2 m 2 so that intrapopulation variations could be examined. In the Lojoping Formation, ‘ Pentamerus ’ dorsoplanus also occurs as a rare element in about 70 m of underlying strata in which Sinokulumbella transvera is the dominant pentameride (Rong et al . 2005), forming intermittent shell beds (Text‐figs 2–3).…”

Section: Methodsmentioning

confidence: 99%

“…‘ Pentamerus ’ dorsoplanus itself occurs in dark grey, microcrystalline limestone. At the Shagugang section, the ‘ Pentamerus ’ bed is underlain by a bed of nodular, micritic mudstone containing Sinokulumbella transversa (see Rong et al . 2005).…”

Section: Methodsmentioning

confidence: 99%

“…Oslo region, Estonia, and western slope of the Urals; Rubel 1970; Sapelnikov 1985), Siberia (Nikiforova and Andreeva 1961) and Kolyma (Nikolaev 1975) during the early Aeronian. South China, however, lacks true Stricklandia (Rong et al . 2005), which is otherwise common in the other palaeoplates or terranes.…”

Section: Palaeogeography Of Aeronian Pentameridesmentioning

confidence: 99%

“…This has skewed Early Silurian biogeographical patterns of brachiopod faunas towards apparent cosmopolitanism. Recent comparative studies, however, have demonstrated that the Early Silurian virgianids and stricklandiids of South China are most similar to those of the Kazakhstan blocks and only distantly related to those of Baltica, Siberia and North America (Rong et al. 2005; Jin et al .…”

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EARLY SILURIAN SULCIPENTAMERUS AND RELATED PENTAMERID BRACHIOPODS FROM SOUTH CHINA

Jiayu¹,

Jin²,

Zhan³

2007

Palaeontology

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Sixteen species from the Lower Silurian (mostly Aeronian and rarely Telychian) of South China have been assigned previously to the brachiopod family Pentameridae, mainly to the genus Pentamerus. Study of intrapopulation variation suggests that 13 species from the upper Aeronian Lojoping Formation of the Yichang area, western Hubei Province, can be synonymized with Sulcipentamerus dorsoplanus, the most abundant pentamerid species of South China but confined to the Yichang area. The conspicuously high and obtuse ventral umbo, strong ventribiconvexity and a sulcate anterior commissure warrant genus status for Sulcipentamerus, independent of Pentamerus. True Pentamerus is rare in South China, known only from upper Aeronian rocks of Guizhou Province. Multivariate analyses indicate that Aeronian pentameride brachiopods of South China are characterized by a high level of provincialism, distinct from those of Laurentia. Also, the Aeronian pentamerides of South China or Laurentia have a low degree of similarity to those of Baltica, Siberia, Avalonia, Kazakhstan and other palaeotropically located plates or terranes. Besides South China and Laurentia, the pentamerides of other palaeotropical regions constituted a relatively tight cluster. This suggests that the palaeogeographical positions of South China and Laurentia only allowed limited or periodic faunal exchange of these generally large‐shelled brachiopods adapted to living in relatively shallow, warm waters.

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Late Ordovician and early Silurian virgianid and stricklandioid brachiopods from North Greenland: implications for a warm‐water faunal province

Jin,

Rasmussen,

Sheehan

et al. 2024

Papers in Palaeontology

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An unusually rich and diverse suite of virgianid brachiopods, hitherto poorly known, is systematically described here for the first time from the Ordovician–Silurian boundary interval (late Katian – Aeronian) of North Greenland. The Late Ordovician virgianids comprise typical taxa of the warm‐water Tcherskidium fauna (e.g. Tcherskidium tenuicostatum, Proconchidium schleyi, Holorhynchus giganteus and Deloprosopus dawesi sp. nov.). Among the early Silurian taxa, Virgiana hursti sp. nov. occurs as abundant shell beds, similar to other congeneric species in Laurentia, but has somewhat larger internal skeletal structures, albeit not as extravagantly developed as in the late Katian virgianids; Borealoides balderi gen. et sp. nov. shows extreme thickening of the shell wall and internal structures, approaching the extravagant calcification of Katian virgianids. The highly distinctive mid‐Aeronian stricklandioid brachiopod genus, Kulumbella, characterized by a shell with criss‐cross (divaricate) ribbing, also occurs in North Greenland, represented by K. heimdali sp. nov., which has the largest and most strongly biconvex shells for the genus. Palaeogeographically, the Late Ordovician virgianid fauna of Laurentia was highly distinct, confined to the low–mid tropical latitudes north of the palaeoequator. In comparison, the early Silurian (Rhuddanian) Virgiana and some related taxa in Laurentia spanned the tropics of both hemispheres, forming extensive shell beds in carbonate basins, although Borealis and Borealoides gen. nov. remained confined largely to the northern hemisphere, suggesting a certain level of provincialism extending into the earliest Silurian. A palaeoecological preference for warm‐water carbonate settings would explain the unusual abundance and richness of the virgianid faunas in North Greenland.

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Two New Genera of Early Silurian Stricklandioid Brachiopods From South China and Their Bearing on Stricklandioid Classification and Paleobiogeography

Cited by 12 publications

References 13 publications

Dynamic patterns of latest Proterozoic‐Palaeozoic‐early Mesozoic marine biodiversity in South China

Dynamic patterns of latest Proterozoic‐Palaeozoic‐early Mesozoic marine biodiversity in South China

EARLY SILURIAN SULCIPENTAMERUS AND RELATED PENTAMERID BRACHIOPODS FROM SOUTH CHINA

Late Ordovician and early Silurian virgianid and stricklandioid brachiopods from North Greenland: implications for a warm‐water faunal province

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