A new genus of the Arenigian bryozoans, Lynnopora, and its systematic position in the family Revalotrypidae Gorjunova, 1988

Gorjunova, R. V.; Koromyslova, A. V.

doi:10.1134/s0031030108050043

Cited by 9 publications

(9 citation statements)

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“…In addition to massive or hemispherical colonies, some bryozoans occurring in the Early Ordovician (Tremadocian–Darriwilian) had erect, bifurcating colonies (Modzalevskaya , ; Pushkin and Popov ; Xia et al . ; Gorjunova and Koromyslova ; Koromyslova ; Ernst et al . ).…”

Section: Discussionmentioning

confidence: 99%

The oldest known bryozoan: Prophyllodictya (Cryptostomata) from the lower Tremadocian (Lower Ordovician) of Liujiachang, south‐western Hubei, central China

Taylor

Fengsheng

et al. 2015

Palaeontology

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A new cryptostome bryozoan, Prophyllodictya simplex sp. nov., is described from the Nantzinkuan Formation (Lower Ordovician, lower Tremadoc) of Liujiachang, central China. This antedates the previously oldest known bryozoan by several million years. Colony morphology and the phylogenetic position of Prophyllodictya within Cryptostomata are explored. Phylogenetic analysis suggests that Cryptostomata (except Prophyllodictya) can be divided into two major groups, and that Prophyllodictya occupies a basal position in the cryptostome tree, which accords with its simple morphology and antiquity. A close relationship is evident between bryozoans from the South China palaeoplate and those from Baltica.

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Section: Discussionmentioning

confidence: 99%

The oldest known bryozoan: Prophyllodictya (Cryptostomata) from the lower Tremadocian (Lower Ordovician) of Liujiachang, south‐western Hubei, central China

Taylor

Fengsheng

et al. 2015

Palaeontology

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“…Twenty-eight samples from the sections yielded over 1,000 bryozoan colonies and fragments, including seven species of esthonioporate bryozoans, Revalotrypa gibbosa (Bassler, 1911), R. papillaris (Modzalevskaya, 1953), R. krestensis Koromyslova in Gorjunova and Koromyslova, 2008, Esthoniopora lessnikowae (Modzalevskaya, 1953), E. clara Koromyslova, 2011, Dianulites janischevskyi Modzalevskaya, 1953, and Orbipora cf. O. acanthophora Bassler, 1911; three species of trepostome bryozoans, Hemiphragma insolitum n.…”

Section: Methodsmentioning

confidence: 99%

“…papillaris (Modzalevskaya, 1953), R . krestensis Koromyslova in Gorjunova and Koromyslova, 2008, Esthoniopora lessnikowae (Modzalevskaya, 1953), E . clara Koromyslova, 2011, Dianulites janischevskyi Modzalevskaya, 1953, and Orbipora cf.…”

Section: Methodsmentioning

confidence: 99%

The oldest bifoliate cystoporate and two other bryozoan taxa from the Dapingian (Middle Ordovician) of north-western Russia

Koromyslova

Fedorov

2020

J. Paleontol.

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Bryozoans from the Dapingian (Middle Ordovician) of the Baltic paleobasin remain poorly studied and their taxonomic composition is unclear. In this paper, three bryozoan taxa, a bifoliate cystoporate Planopora volkhovensis n. gen. n. sp., a trepostome Hemiphragma insolitum n. sp., and an esthonioporate Esthoniopora clara Koromyslova, are described from Dapingian deposits of an unusual clayey-calcareous Hecker-type mudmound on the right bank of the Volkhov River in Leningrad Oblast’, north-western Russia. Combined X-ray microtomography, scanning electron microscopy, and light microscopy of thin sections were used to characterize their morphology. Analysis of the stratigraphic distribution of early cystoporate bryozoans suggests that Planopora n. gen. is the oldest сystoporate bryozoan with an erect, bifoliate colony. The growth modes of these bryozoans are discussed. The colonies of P. volkhovensis n. gen. n. sp. and E. clara have an attachment structure, a holdfast, at their base, probably indicating their attachment to sponge spicules. The bryozoan H. insolitum n. sp. produced rod-like colonies, formed by overgrowing the problematic tubular fossil Sphenothallus Hall. It can be assumed that sponges with unfused siliceous spicules and individuals of Sphenothallus were numerous on the surface of the mudmound during its formation and provided a suitable substrate for settlement of bryozoan larvae. UUID: http://zoobank.org/5715872a-8c61-446e-9413-d713fdef1a08

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“…Five genera are known from NW Russia and Estonia, all belonging to either the order Trepostomata (Hemiphragma, Phragmopora, Estoniopora and Dittopora; Pushkin & Popov 1999) or the order Cystoporata (Revalotrypa and Lynnopora; Gorjunova & Koromyslova 2008). Elsewhere the trepostome Orbipora was recorded from Wales (Taylor & Cope 1987), and the cryptostome Profistulipora from Siberia (Astrova 1965), while the trepostome Nicholsonella was mentioned by Carrera (1995) and Carrera & Ernst (2010) from the Floian part of the San Juan Formation of Argentina.…”

Section: Floianmentioning

confidence: 97%

Chapter 12 A review of the Early Palaeozoic biogeography of bryozoans

Buttler

Jackson

Ernst

et al. 2013

Memoirs

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The palaeogeographical distributions of Early Palaeozoic bryozoan faunas are reviewed. Previous studies are examined and new databases have been assembled of the stratigraphical and geographical distribution of Ordovician and Silurian taxa. Analysis was carried out using cluster analysis based on Jaccard’s coefficient and paired group method, as well as principal coordinate analysis based on Jaccard’s coefficient, to examine the relationships between different localities. Bryozoan faunas increased in diversity throughout the Ordovician peaking with 133 genera during the Katian. In the earliest Ordovician provincialism is difficult to determine, but by the Darriwilian five distinct provinces developed, decreasing to four in the Sandbian. There was a decrease in provinciality throughout the Katian as faunas became less endemic, caused by the reduction of geographical barriers. Following the extinction of many genera at the end of the Ordovician, early Silurian faunas contain remnant taxa. Subsequently fenestrates began to dominate faunas. During the Llandovery bryozoans began to show distinct provincialism, but this declined during the Wenlock, only to re-emerge during the Ludlow. Late Silurian (Pridoli) faunas are sparse but nevertheless show possible division into two provinces.

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A new genus of the Arenigian bryozoans, Lynnopora, and its systematic position in the family Revalotrypidae Gorjunova, 1988

Cited by 9 publications

References 1 publication

The oldest known bryozoan: Prophyllodictya (Cryptostomata) from the lower Tremadocian (Lower Ordovician) of Liujiachang, south‐western Hubei, central China

The oldest known bryozoan: Prophyllodictya (Cryptostomata) from the lower Tremadocian (Lower Ordovician) of Liujiachang, south‐western Hubei, central China

The oldest bifoliate cystoporate and two other bryozoan taxa from the Dapingian (Middle Ordovician) of north-western Russia

Chapter 12 A review of the Early Palaeozoic biogeography of bryozoans

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