Prymnesium pienaarii

Taxonomy:

Original description: Cellules palmelloïdes circulaires ou anguleuses de 7-8 µm en vue apicale et de 3-4 μm dans le sens antéro-postérieur. Présence d'une zone claire centrale ovale, dépourvue de flagelles visibles en microscopie photonique. Deux à quatre plastes pariétaux jaune-brun lobés pourvus chacun d'un pyrénoïde inclus, fusiforme, traversé par une bande de deux thylakoïdes. Inclusions intracytoplasmiques biréfringentes. Cellules jeunes lisses, devenant granuleuses avec l'âge. Cellules mobiles peu métaboliques, à phototactisme positif, allongées et légèrement tronquées au sommet. Dimensions: 8-9 μm x 2-3 μm. Flagelles légèrement plus courts que la cellule, longs de 7 µm environ et haptonème de diamètre constant, long de 2 μm. Deux plastes pariétaux antérieurs. Ecailles internes pluristratifiées, circulaires ou ovales, de 0.33 µm x 0.26 µm; face proximale ornée de stries radiales; face distale ornée d'un peloton central et d'une marge relativement large résultant de l'inflexion du bord de l'écaille, composée de stries concentriques. Ecailles externes en une seule couche, à base de 0.36-0.39 μm x 0.26-0.27 μm, en forme de coupe à bord droit haut de 0.11 à 0.13 μm. Face proximale ornée de stries radiales; face distale caractérisée par environ 10 cloisons radiales dont la hauteur diminue du bord de l'écaille vers un nodule central. Pas de kystes connus.

Cellulae palmelloides circulares vel angulares, 7-8 µm diam. in apicalem visum et 3-4 µm magnae in latere visum. Area diluta centralis ovalis, flagellorum adspectabilorum per microscopium luminarium nudata. Chloroplasti duo vel quatuor, fulvi, parietales, lobati, quisque munitus pyrenoides fusiforme immersa duo thylacoidibus percursa. Granula birefractiva in cytoplasme. Juvenes cellulae enodes, veteres cellulae granulatissimae. Cellulae mobiles paulum metabolae, luminare attractae, elongatae et pauxillum truncatae, 8-9 µm x 2-3 μm magnae. Flagella minime breviora quam cellulae, circiter 7 µm longa et haptonema, aequali diametro, 2 µm longum. Chloroplasti duo parietales antici. Squamae stratorum interiorum applanatae circulares vel ovales, 0.33 µm x 0.26 μm magnae. Aspectus proximalis striis radiantibus ornatus. Aspectus distalis striis plus minusve concentricis et satis magno inflexo constituto ex striis concentricis margine ornatus. Squamae strati interioris, ovali base 0.36-0.39 µm x 0.26-0.27 μm magna, cupulatae ora recta 0.11-0.13 μm alta. Aspectus proximalis striis radiantibus ornatus. Aspectus distalis circiter decem radiantibus tenuibus muris distinctus. Nullae cystae cognitae.
HOLOTYPUS: figurae nostrae 1-10.

Farinacci & Howe catalog pages: Platychrysis pienaarii

Morphology:

Geological Range:
Last occurrence (top): Extant. Data source:
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source:

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Prymnesium

Prymnesium pienaarii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-6-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20399 Go to Archive.is to create a permanent copy of this page - citation notes

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