New Hirnantian orthide brachiopods from the type section of the Porkuni Stage (Porkuni quarry, northeastern Estonia)

Hints, Linda

doi:10.3176/earth.2012.4.04

Cited by 14 publications

(8 citation statements)

References 14 publications

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“…The new species is also similar in some aspects to another draboviinae from the Hirnantian of Estonia of uncertain generic position, Drabovia ? minuta Hints, . The author remarked on the features of this species in common with different draboviine genera, ascribing it provisionally to Drabovia .…”

Section: Systematic Palaeontologymentioning

confidence: 98%

Late Ordovician brachiopods from Peru and their palaeobiogeographical relationships

2015

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A Sandbian brachiopod association from the Calapuja Formation, in the Peruvian Altiplano, north‐west of Lake Titicaca, has allowed a re‐examination of the palaeobiogeographical relationships between Gondwana and Avalonia during the Late Ordovician, when the palaeocontinents are considered to be already very distant from one another. The brachiopod fauna includes the new species Onnizetina calapujensis sp. nov., Horderleyella chacaltanai sp. nov., Drabovinella minuscula sp. nov. and Tasmanella curtiseptata sp. nov., as well as Caeroplecia sp., Dinorthis cf. flabellulum and Tunariorthis cardocanalis. In addition, Colaptomena expansa expansa and Heterorthis retrorsistria, known from the British Burrellian Stage of the Caradoc Series (late Sandbian) in Wales and the Welsh Borderlands, have also been identified. The brachiopod collection is the most diverse known from a single locality in the whole Central Andean Basin. Within it, forms with clear Gondwanan links occur, such as the new species of Onnizetina, Drabovinella and Horderleyella, and typical representatives of the Avalonian faunas, such as the Welsh Colaptomena expansa expansa and Heterorthis retrorsistria. The brachiopod species exchange between the Proto‐Andean margin of Gondwana and Avalonia, now believed to be possible during the late Sandbian, allows a reconsideration of the global taxonomic affinities of both regions. With this in mind, detrended correspondence analysis (DCA) and cluster analysis have been applied to an updated rhynchonelliformean brachiopod matrix consisting of presence/absence data. The scatter plot resulting from the DCA allows a vivid visualization of the grouping and geographical trends of the South American localities with respect to Avalonia–Baltica and the Mediterranean margin of Gondwana during the Sandbian. Our results agree with previous palaeogeographical reconstructions, depicting Avalonia very close to Baltica and already distant from Gondwana. As a few brachiopod species, with low dispersal potential, would have been able to migrate between those distant palaeocontinents, the existence of intermediate islands in the Rheic Ocean, permitting the transit by island hopping of eurythermal species, must be considered.

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Section: Systematic Palaeontologymentioning

confidence: 98%

Late Ordovician brachiopods from Peru and their palaeobiogeographical relationships

2015

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“…Drabovia ? minuta Hints, 2012, from Porkuni strata (Hirnantian) of Estonia is similar to D . noixella in its small shell with a fairly strong biconvexity for this genus, relatively short hinge line, relatively coarse fascicostellae, and strong growth lamellae in the anterior part of the shell.…”

Section: Systematic Paleontologymentioning

confidence: 70%

An Edgewood-type Hirnantian fauna from the Mackenzie Mountains, northwestern margin of Laurentia

Jin,

Harper

2024

J. Paleontol.

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Silicified brachiopods from Hirnantian strata in three sections of the lower Whittaker Formation, Mackenzie Mountains, northwestern Canada, yielded a moderately diverse, Edgewood-type Hirnantian fauna, consisting of 13 species: Biparetis paucirugosus, Brevilamnulella laevis, Dalmanella edgewoodensis, Drabovia noixella, Eospirigerina putilla, Epitomyonia paucitropida, Epitomyonia sekwiensis, Glyptorthis papillosa new species, Gnamptorhynchos orbiculoidea, Katastrophomena mackenzii new species, K. parvicardinis, Parastrophina cf. P. minor, and Skenidioides sp. Compared to the typical Edgewood fauna of the American Midcontinent, Brevilamnulella laevis has a notably smaller shell than B. thebesensis, and is interpreted as a deeper-water form. The strong faunal affinity of the Mackenzie Mountains fauna to the Edgewood-type Hirnantian fauna is indicated by the occurrence of Biparetis, Brevilamnulella, Eospirigerina, and Gnamptorhynchos. In addition to the Edgewood type area within Laurentia, Biparetis, Eospirigerina, and Gnamptorhynchos are characteristic taxa that also occur in the Ellis Bay Formation (Hirnantian) of Anticosti Island. Multivariate and network analyses strongly support the differentiation between an Edgewood-type Hirnantian fauna in Laurentia and peri-Laurentia and the typical Hirnantia fauna of the Kosov Province in Gondwana, peri-Gondwana, South China, Kazakhstan terranes, Avalonia, and Baltica. UUID: http://zoobank.org/7ff8f8c8-52d1-4527-acae-9bacd2e8b914

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“…A shallow warm epicontinental sea covered what would become modern northern Estonia during the Hirnantian. The Hirnantian sequence of northern and middle Estonia is represented by tropical carbonate rocks belonging to the Ärina Formation (Porkuni Regional Stage) (Hints and Meidla, 1997;Hints et al, 2000;Kröger, 2007). There was a significant climatic change in the Katian of Baltica, when the paleocontinent drifted from a temperate climatic zone into the tropical realm (Torsvik et al, 2012).…”

Section: Geological Background and Localitymentioning

confidence: 99%

A new genus and species of cornulitid tubeworm from the Hirnantian (Late Ordovician) of Estonia

Vinn,

Wilson,

Toom

2024

J. Paleontol.

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A new cornulitid genus and species, Porkuniconchus fragilis new genus and species, is here described from the Ärina Formation (Hirnantian, Porkuni Regional Stage) of northern Estonia. This new taxon differs from most cornulitids by having a fusiform ornamentation pattern that is somewhat similar to that of Kolihaia. All studied specimens are attached to a carbonate hardground. The hardground fauna is by abundance and encrustation area dominated by cornulitids. Other encrusters are represented only by a single sheet-like cystoporate bryozoan. The cornulitid specimens represent different growth stages, which suggest that the hardground was continuously colonized by cornulitid larvae. The high encrustation density indicates that the studied hardground may have represented a high-productivity site in the Hirnantian of the Baltic Basin. UUID: http://zoobank.org/623afcc3-ab32-4e8f-be14-a1093cba4ae6

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New Hirnantian orthide brachiopods from the type section of the Porkuni Stage (Porkuni quarry, northeastern Estonia)

Cited by 14 publications

References 14 publications

Late Ordovician brachiopods from Peru and their palaeobiogeographical relationships

Late Ordovician brachiopods from Peru and their palaeobiogeographical relationships

An Edgewood-type Hirnantian fauna from the Mackenzie Mountains, northwestern margin of Laurentia

A new genus and species of cornulitid tubeworm from the Hirnantian (Late Ordovician) of Estonia

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