Rimoportula Distribution, Heterovalvy and Heteropolarity in Hyalosira (Bacillariophyta: Rhabdonematales), with Revision of H. hesperia and Two New Species

Lobban C. S., BİZSEL N., Blanco S.

PROTIST, vol.173, no.3, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 173 Issue: 3
  • Publication Date: 2022
  • Doi Number: 10.1016/j.protis.2022.125869
  • Journal Name: PROTIST
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, EMBASE, MEDLINE, Veterinary Science Database
  • Keywords: Benthic marine diatoms, biodiversity, heteropolarity, heterovalvy, rimoportulae, taxonomy
  • Dokuz Eylül University Affiliated: Yes

Abstract

The genus Hyalosira Kutzing was recently split and emended based on morphology and molecular phylogeny but many uniseriate taxa could not be resolved. All populations examined in that study had one rimoportula on each valve (i.e., 1 + 1 in the cell). Recent collections from Turkey, Australia, and Micronesia had uniseriate taxa with different numbers of rimoportulae and other new features distinguishing them from all other uniseriate taxa. Two species had two rimoportulae per valve (i.e., 2 + 2) ' and deep septa, of which one is shown to be Hyalosira hesperia A we provide a revised description, and the other, from Melbourne and Yap, is proposed as H. pacifica, sp. nov. They are separated by stria density and copula areola density. A third species, from the Great Barrier Reef, H. flexa, sp. nov., is the first Hyalosira found with heterovalvy-including a rimoportula on only one valve (i.e., 1 + 0)-and heteropolarity, including three variously reduced pore fields and the fourth, with the rimoportula, always involved in attachment, essentially a basal pole. A corrected diagnosis of the genus is provided and implications for exploring the functions of rimoportulae are discussed. lvarez-Blanco & S.Blanco, for which