Prymnesium annuliferum

Taxonomy:

Original description: Cellules allongées (10-14 x 6.5 μ,m) non aplaties et non métaboliques à pôle antérieur tronqué obliquement. Deux larges plastes pariétaux jaune doré découpés, occupant la moitié supérieure des cellules et à pyrénoïdes internes assez visibles. Appendices antérieurs subapicaux, comprenant 2 flagelles hétérodynames légèrement inégaux (19 et 20-22 μ,m) et un haptonème souple (5-6 μ,m). Nage semblable à celle de P. zebrinum, Cellules couvertes de corps mucifères et revêtues de deux types d'écailles. Écailles proximales plates ( c. 0.49 X 0.4 μm) formant une à plusieurs couches et à ornementation identique à celle de P. parvum. Revêtement externe formé d'une couche d'écailles allongées (c. 0.53 x 0.39 μm): face proximale à ornementation semblable à celle de la face proximale des écailles plates; face distale porteuse d'une série de 2-3 crêtes concentriques de 0.07 μ,m de hauteur chacune, la crête externe constituant le bord de l'écaille; chaque crête formée de fibrilles concentriques, la dernière crête réduite à une ébauche semi-circulaire ou morcelée en 1-2 barrettes centrales. Kystes inconnus.

Cellulae elongatae (10-14 x 6.5 μm) non aplanatae et non metabolae cum anterio parte oblique truncata. Chromatophora 2 parietalia magna aurea aurea lobataque occupantia dimidium superum cellulae cum pyrenoidibus internis satis visibilibus. Appendices antice subapicales, flagella 2 heterodynamica plus minusve inaequalia (19 et 20- 22 μm) haptonemaque flexile (5-6 μ,m). Motus natantes idem ac is Prymnesium zebrini. Cellulae obtectae corporibus muciferibus et typis squamarum 2 velatae. Squamae proximales applanatae (c. 0.49 x 0.4 μm) stratis 1-2 cum ornamentis isdem ac eis Prymnesium parvi Cortex externus constatus ex strato squamarum elongatarum (c. 0.53 x 0.39 μm): aspectus proximalis cum ornamento eodem ac eo aspectus proximalis squamarum applanatarum; aspectus distalis ferens seriem 2-3 annulorum concentricorum (0.07 μm altorum omnium), annulo externo formanti marginem squamae, annulo ultimo deminuto ad delineationem semicircularem vel interrupto in 1-2 frusta centralia. Cystae desunt.

Farinacci & Howe catalog pages: Prymnesium annuliferum

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 annuliferum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-6-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20386 Go to Archive.is to create a permanent copy of this page - citation notes

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