Life History and Systematic Studies of Pseudothrix borealis gen. et sp. nov. (=North Pacific Capsosiphon groenlandicus, Ulotrichaceae, Chlorophyta)

Abstract

Sea coast of Alaska or the Arctic coasts of Alaska or Siberia.Capsosiphon groenlandicus (J. Agardh) K.L. Vinogradova, as the species is now known, does not fit well in any of the genera to which it has been assigned. It differs from Monostroma in that the tubular thallus never ruptures longitudinally to form a monostromatic blade. Because of this, Setchell and Gardner (1920) assigned the species to Enteromorpha, as E. groenlandica (J. Agardh) Setchell & N.L. Gardner, but noted that it did not fit easily in that genus either since the cells of the thallus were not set sufficiently close together to make the thallus appear parenchymatous, as is characteristic of species of Enteromorpha (now included in Ulva -Hayden et al. 2003). In 1968, Vinogradova made the combination Blidingia groenlandica (J. Agardh) K.L. Vinogradova. The following year, she included the species in Capsosiphon, noting the loose arrangement of cells, similar to other species of that genus (Vinogradova 1969, without

Reconstructing the Phylogeny ofCapsosiphon fulvescens(Ulotrichales, Chlorophyta) from Korea Based onrbcL and 18S rDNA Sequences

“…Our phylogenetic tree shows that Ulotrichales appears to be paraphyletic. Two clearly different lineages in Ulotrichaceae ( Acrosiphonia and Urospora ) were also successfully recovered with >80% of bootstrap numbers in all 3 phylogenetic methods (ML/MP/NJ = 81/83/85), which was also consistent with the SSU rDNA tree [ 14 , 21 ]. The key result here is that the tree topology in Ulotrichaceae shows 4 distinct lineages: Gloeotilopsis , Acrosiphonia , Capsosiphon , and Urospora + Protomonostroma ( Figure 2 ).…”

“…They suggested that C. fulvescens was in the order Ulotrichales, which was consistent with Nagata's report [ 12 ]. In 2008, Hanic and Lindstrom [ 14 ] also used 18S rDNA sequence to prove that C. fulvescens and Pseudothrix borealis (entity formerly called C. groenlandicus ) do not belong in the same genus Capsosiphon .…”

Taxonomic identification and life cycle comparison of two populations of the monostromatic green algae Monostroma nitidum

“…In 1969, Vinogradova classified M. groenlandicum into the genus Capsosiphon and established two new genera, Protomonostroma and Gayralia (Vinogradova, 1969 ), and classified the asexually reproduced species M. undulatum and M. oxysperma as the model species Protomonostroma undulatum and G. oxysperma , respectively. However, C. groenlandicus has been classified as Pseudothrix groenlandica based on the results of a conjoint analysis of ribosomal SSU and ITS sequences (Hanic & Lindstrom, 2008 ). Additionally, M. applanatum and M. endiviifolium have been renamed Antarctosaccion applanatum (Delépine et al., 1970 ) and Pyropia endiviifolia (Sutherland et al., 2011 ), respectively (Figure 8 ).…”

Molecular Phylogeny of Unicellular Marine Coccoid Green Algae Revealed New Insights into the Systematics of the Ulvophyceae (Chlorophyta)

“…C. willei and C. porphyrae differ only slightly in morphology to C. moorei (cell wall thickening in C. willei and presence of biflagellated isogametes in C. porphyrae ) and were found as epiphytes of Blidingia minima and species of Porphyra , respectively. The partial SSU rDNA sequences of Halochlorococcum porphyrae (DQ821518, DQ821519 and DQ821520; [ 79 ]) were identical to both strains (CCAP 6005/6 and CCMP 2288).…”