Chrysochromulina microcylindra

Original description: Cells subspherical, 4-7 µm diameter; flagella 2 equal, 20-25 µm long and a haptonema, 16-30 µm long when extended. Scales of two types, inner scales plate-like, oval to sub circular, length 0.6-1.0 µm, breadth 0.5-1.0 µm, thin with a cruciform plane centre and a pattern of radiating ridges visible on both surfaces but the ridges covered with a thin band of concentrically striated material on the distal surface near the edge. Outer scales cylindrical straight-sided, very thin, diameter 0.1-0.2 µm, length very variable 0.5-3.0 µm, arising centrally from a stouter radially striated base plate diameter 0.4-0.5 µm; base plates without attached cylinders frequent. 2 lateral orange chloroplasts with non-projecting pyrenoids.

Cellula subsphaerica, 4-7 µm diam.; flagella 2 aequalia, 20-25 µm longa; haptonema 16-30 µm longum. Squamae dimorphae. Squama strati interioris laminaris, ovalis vel suborbicularis, 0.6-1.0 µm longa, 0.5-1.0 µm lata, tenuis, area centrali plana, circllm eam carinis radiantibus utrinque visibilibus ornata, clava tenui concentrice striata ultimas partes carinarum extra obtegente. Squama strati exterioris cylindrica, lateribus rectis, tenuissima, 0.1-0.2 µm diam., longitudinis pervariae, 0.5-3.0 µm Zonga, e lamina basali crassiore, 0.4-0.5 µm diam., radiatim striata oriens, laminis basalibus cylindris carentibus multis observatis. Chloroplasti 2 pallideflllvi, laterales, pyrenoida non projecta gerentes.

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: affinity not established

Chrysochromulina microcylindra compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20103 Go to Archive.is to create a permanent copy of this page - citation notes

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