Notes on the rare Cretaceous species Syndetocystis uralensis Strelnikova leading to the description of a new monotypic genus Monoportula P.A.Sims et D.M.Williams nov. gen.

DAVID M. WILLIAMS; PAT A.  SIMS; JAKUB WITKOWSKI

doi:10.11646/phytotaxa.595.2.8

Issue: Vol. 595 No. 2: 5 May 2023

Type: Article

Published: 2023-05-05

DOI: 10.11646/phytotaxa.595.2.8

Page range: 219-224

Abstract views: 65

PDF downloaded: 2

Notes on the rare Cretaceous species Syndetocystis uralensis Strelnikova leading to the description of a new monotypic genus Monoportula P.A.Sims et D.M.Williams nov. gen.

DAVID M. WILLIAMS⁺⁻
PAT A. SIMS⁺⁻
JAKUB WITKOWSKI⁺⁻

The Natural History Museum, Cromwell Road, London, SW7 5BD, UK

Uniwersytet Szczeciński, Instytut Nauk o Morzu i Środowisku, Mickiewicza 18, 70-383 Szczecin; Institute of Marine and Environmental Sciences, University of Szczecin, Institute of Marine and Environmental Sciences, Mickiewicza 18, 70-383 Szczecin, Poland

Syndetocystis Rutilaria periplekton rimoportula Algae

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Abstract

Syndetocystis uralensis, an Upper Cretaceous species from the ‘Tyumen Oblast, Ust’-Man’ya, N. Sos’va River’, first described by Strelnikova, is described in detail using light and electron microscopy. Its unique morphology precludes its inclusion in either Syndetocystis or Rutilaria as the projection extending from the external surface of the valve is not a periplekton. Although some suggestions are made as to its more appropriate place, for the moment it is best placed in the monotypic genus Monoportula uralensis and as incertae sedis. Some speculations on its higher-level relationships are considered.

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