Myxacorys Pietrasiak & J.R.Johansen, 2019

Holotype species: Myxacorys chilensis Pietrasiak & J.R.Johansen

Original publication and holotype designation: Pietrasiak, N., Osorio-Santos, K., Shalygin, S., Martin, M.P. & Johansen, J.R. (2019). When is a lineage a species? A case study in Myxacorys gen. nov. (Synechococcales: Cyanobacteria) with the description of two new species from the Americas. Journal of Phycology 55(5): 976–996 .

Description: Colony with sinuous, wavy fascicles of filaments, spreading from center, olive green in color. Filaments with single trichomes without sheath in young cultures and hormogonia, later with one to two trichomes in a common sheath, the sheath ruptures soon after forming two trichomes in a sheath and the filament forms pseudobranches , also forming tight loops within a common filament, which break to form geminate pseudobranches. Sheath colorless, soft, thin. Trichomes sometimes twisted within the sheath, slightly constricted at the cross walls, with meristematic zones, with necridia, up to 3 µm wide. Cells shorter than wide to isodiametric, occasionally longer than wide when stressed, with chromoplasm distinct from centroplasm (i.e., evident parietal thylakoids). Apical cells rounded to conical, sometimes forming irregularly shaped involution cells. Hormogonia may be widened at one end, tapering toward the more actively growing opposite end. Following transfer to fresh, nutrient-replete media, trichomes lack sheath material and terminal slime caps; in senescent cultures with well-developed sheath present, with a broadened terminal or subterminal slime cap. Calyptra never present.

Information contributed by: Original description and original diagnosis.. The most recent alteration to this page was made on 2023-03-03 by M.D. Guiry.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Strunecký, O., Ivanova, A.P. & Mares, J. (2022 '2023'). An updated classification of cyanobacterial orders and families based on phylogenomic and polyphasic analysis (Review). Journal of Phycology 59(1): 12-51.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=52579

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 03 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 26 April 2024