Loricate choanoflagellates (Acanthoecida) from warm water seas. VI. Pleurasiga Schiller and Parvicorbicula Deflandre

Helge Abildhauge Thomsen*, Nina Kamennaya, Mikhail V. Zubkov, Jette Buch Østergaard

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The loricate choanoflagellate genera Pleurasiga and Parvicorbicula are taxonomically ambiguous. Pleurasiga because of the uncertainty that relates to the true identity of the type species, and Parvicorbicula because too many newly described species over time have been dumped here in lack of better options. While all species currently allocated to the genus Pleurasiga (with the exception of the type species) are observed in our samples from the global warm water belt, the genus Parvicorbicula is represented by just a few and mostly infrequently recorded taxa. Two new species, viz. Pl. quadrangiella sp. nov. and Pl. minutissima sp. nov., are described here. While the former is closely related to Pl. echinocostata, the latter is reminiscent of Pl. minima. Core species of Pleurasiga and Parvicorbicula deviate from the vast majority of loricate choanoflagellates in having both the anterior and the mid-lorica transverse costae located exterior to the longitudinal costae. In Pl. quadrangiella there is no mid-lorica transverse costa but rather a small posterior transverse costa located inside the longitudinal costae. In Pl. minutissima the mid-lorica transverse costa has extensive costal strip overlaps which reveal patterns of costal strip junctions that deviate from the norm.
Original languageEnglish
Article number125717
JournalEuropean Journal of Protistology
Volume75
Number of pages21
ISSN0932-4739
DOIs
Publication statusPublished - 2020

Keywords

  • Acanthoecida
  • Loricate choanoflagellates
  • Pleurasiga
  • Parvicorbicula
  • Warm water seas

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