Chrysowaernella Gayral & Lepailleur, 1977

Holotype species: Chrysowaernella hieroglyphica (Waern) Gayral & Lepailleur ex Gayral & Billard

Currently accepted name for the type species: Nematochrysis hieroglyphica Waern

Original publication and holotype designation: Gayral, P. & Billard, C. (1977). Synopsis du nouvel ordre des Sarcinochrysidales (Chrysophyceae). Taxon 26(2/3): 241-245 (-246). [in French]

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Description: Unbranched filaments,, uniseriate when young and reaching up to 300 (-500) &m long. Longitudinal divisions take place at different levels akong the filament, especially in the distal parts which become enlarged and pluriseriate. Plants attached by a basal cell surrounded by mucilage. Cells ( 4 ( 3-6 &m) with 1-2 yellow-brown, parietal, cup- or V-shaped chloroplasts, lacking pyrenoids. Chrysolaminaran vacuole difficult to detect due to small size. Individual cell-walls and filament envelope thick with respect to cell size. One zoospore formed per cell, from uniseriate or pluriseriate portions of the filament. Zoospores positively phototactic, ovate (3-4 ( 5-6 &m), with two lateral heterokont flagella (6 and 12 &m). The leading anterior flagellum bears tripartite mastigonemes, while the trailing posterior flagellum is smooth and acronemtatic. One basal chloroplast with a stigma. No stomatocysts nornor sexual reproduction recorded in culture. Extracellular calcification may take place around some cells in older cultures and these particular formations were termed pseudokysts by Gayral and Lepailleur (1971). Various ecologic surveys show that C.hieroglyphica, an epiphytic plant, occupies the same biotopes (brackish areas) in the northern hemisphere as another marine chrysophyte Chrysomeris ramosa, but has been less frequently recorded, probably due to its smaller size.

Information kindly contributed by C.Billard but may now be outdated.

Taxonomic status: This name is currently regarded as a synonym of Nematochrysis.

Gender: This genus name is currently treated as feminine.

Most recent taxonomic treatment adopted: Graf, L., Yang, E.C., Han, K.Y., K├╝pper, F.C., Benes, K.M., Oyadomari, J.K., Herbert, R.J.H., Verbruggen. H., Wetherbee, R., Andersen R.A. & Yoon, H.S. (2020). Multigene phylogeny, morphological observation and re-examination of the literature lead to the description of the Phaeosacciophyceae classis nova and four new species of the heterokontophyta SI clade. Protist 171(125781): 1-25, 10 figs, 1 table.

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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.

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M.D. Guiry in Guiry, M.D. & Guiry, G.M. 10 October 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.; searched on 04 March 2024

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