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Issue: Vol. 5284 No. 2: 11 May 2023
Type: Article
Published: 2023-05-11
DOI: 10.11646/zootaxa.5284.2.6
Page range: 337-350
Abstract views: 179
PDF downloaded: 10

Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987

Department of science and research; Kuban State University; Stavropol’skaya Str.; 149; Krasnodar; 350040; Russia; Kazan Federal University; Kremlevskaya Str.; 18; Kazan; 420008; Russia
Saint Petersburg State University; Universitetskaya nab. 7-9; St. Petersburg; 199034; Russia
Bryozoa Baltic paleobasin evolution Early Palaeozoic protective structures

Abstract

Some Sandbian (Late Ordovician) bryozoans are here described from the Leningrad region, north-western Russia. The studied association is represented by eight species including one new cryptostome bryozoan Prophyllodictya khrevitsa n. sp. We explore the colony morphology and evolutionary morphogenesis of Prophyllodictya Gorjunova, 1987 and discuss the morphological features of trepostome and cryptostome bryozoans from the Khrevitsa Formation. Finally, we classify protective structures in bryozoan colonies in three groups based on functional criteria: 1) structures to strengthen the colony, 2) structures to defend the colony against predators, and 3) structures to protect the polypide.

 

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