Linguliform brachiopods from the Cambrian (Guzhangian) Karpinsk Formation of Novaya Zemlya

Holmer, Lars E.; Popov, Leonid E.; Pour, Mansoureh Ghobadi; Klishevich, Inna A.; Liang, Yue; Zhang, Zhifei

doi:10.1002/spp2.1314

Cited by 2 publications

(1 citation statement)

References 39 publications

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“…4.7, 4.12). This type of dorsal metamorphic shell is similar to that described from an unnamed problematic species of Acrothele from the Guzhangian of Novaya Zemlya (Holmer et al, 2020, fig. 6E–H); in both these species, the dorsal lobes are considered to represent impressions from a single pair of metamorphic setal sacks (see also Zhang et al, 2018, fig.…”

Section: Systematic Paleontologysupporting

confidence: 79%

Cambrian (Stage 4 to Wuliuan) brachiopods from Sonora, Mexico

Holmer

Clausen²,

Попов³

et al. 2022

J. Paleontol.

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The Cambrian successions at the Chihuarruita Hill outcrop, Sonora, Mexico, have yielded two successive linguliform brachiopod assemblages that are transitional between Cambrian Stage 4 and the newly recognized global Wuliuan Stage. The lowermost assemblage includes Dictyonina sp., Paterina sp., Eothele sp., Hadrotreta rara? (Cooper), and Linnarssonia arellanoi? (Cooper), coming from the upper part of the Buelna Formation. The younger, recently named El Gavilán Formation contains a more diverse linguliform brachiopod assemblage, including Acrothele concava Cooper, Batenevotreta? mexicana n. sp., Dictyonina minutipuncta Cooper, Eothele sp., Eoobolus sp., Hadrotreta rara? (Cooper), Linnarssonia arellanoi? (Cooper), Micromitra sp., Paterina sp., and Prototreta sp. The El Gavilán Formation contains a diverse trilobite fauna suggesting Delamaran age in terms of the Laurentian regional stratigraphical scheme. The base of the global Wuliuan Stage and Miaolingian Series is defined by the first occurrence of Oryctocephalus indicus; in the absence of the index species, the base should be provisionally placed at the base of the El Gavilán Formation. The Wuliuan age of the brachiopod assemblage recovered from the El Gavilán Formation is supported by the occurrence of Acrothele in the Cambrian biostratigraphical succession of Himalaya, where the genus makes its first appearance in the Kaotaia prachina Zone. In addition, the co-occurrences of Acrothele and Eothele can be taken as an indication of the Wuliuan age of the fauna. A new biogeographic analysis confirms that the Eothele Fauna first appeared at the end of Cambrian Stage 4, as a result of increased faunal migration within the southern tropical latitudes directed from Australasian Gondwana to Laurentia. UUID: http://zoobank.org/6598f51f-cb07-4df3-bd1f-025a13e64edf

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Section: Systematic Paleontologysupporting

confidence: 79%

Cambrian (Stage 4 to Wuliuan) brachiopods from Sonora, Mexico

Holmer

Clausen²,

Попов³

et al. 2022

J. Paleontol.

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The identity and significance of the high-latitude Early Ordovician Mediterranean brachiopod Province

Cocks

Popov

2021

Geol. Mag.

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During the Early Ordovician Epoch, the Mediterranean brachiopod Province was extensive in the higher-latitude sectors of the globe in the Southern Hemisphere. The latter was much occupied by the massive continent of Gondwana, which stretched from north of the Equator S-wards to cover the South Pole. The Mediterranean Province can be separated into two groups: Group 1, the higher-latitude fauna dominated by large linguliform brachiopods; and Group 2, which is more diverse, particularly in orthides. The large linguliform brachiopod faunas are particularly well known in southern Europe (France, Spain and Bohemia) and North Africa, and the second group in Avalonia, Chile and Argentina. The province is different from, but merges with, more diverse contemporary faunas in the lower latitudes of Gondwana to its north, although the latter contrast with other lower-latitude faunal provinces in South China, Laurentia, Siberia and elsewhere. Since the Rheic Ocean between Avalonia and Gondwana was relatively narrow during the Early Ordovician Epoch, the Avalonian brachiopods were integral parts of the Mediterranean Province, but only until end of the Dapingian Age. This paper focuses on the earlier phases of the Mediterranean Province, although the province continued until near the end of the Ordovician Period. Intermediate-latitude Baltica and some other faunas are included in new principal components and other analyses in order to compare them with the Mediterranean Province faunas. Radiation was very significant for many brachiopod taxa during the period, with first appearances of the Plectambonitoidea (Taffiidae), several orthide families (Euorthisinidae, Tarfayidae and Anamalorthidae) and the earliest endopunctate orthide, the dalmanelloid Lipanorthis.

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Linguliform brachiopods from the Cambrian (Guzhangian) Karpinsk Formation of Novaya Zemlya

Cited by 2 publications

References 39 publications

Cambrian (Stage 4 to Wuliuan) brachiopods from Sonora, Mexico

Cambrian (Stage 4 to Wuliuan) brachiopods from Sonora, Mexico

The identity and significance of the high-latitude Early Ordovician Mediterranean brachiopod Province

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