Chrysochromulina acantha

Original description: Cells usually saddle shaped, convex dorsally, concave ventrally, c. 6-10 µm in length and breadth, with two parietal pale golden-brown plastids each with a non-projecting pyrenoid. Two equal flagella arising with the haptonema from the concave surface near the posterior end. The haptonema, containing 7 microtubules, c. 40 µm when fully extended (= twice the flagellar length) coiled into a helix of 15-20 gyres when retracted. Cells covered with mucilage and with two layers of very thin scales visible only with an electron microscope, the scales of the outer layer carrying spines, those of the under layer spineless and platelike. The latter, c. 0.5 µm wide x 0.6 µm long, with a pattern of sparse ridges ra- diating from the centre to a thickened margin, rims absent. The spiny scales similar in patterning but circular, e. 0.4-0.5 µm in diameter each carrying a single central spine, c. 0.5 µm long, supported by four decurrent struts reaching the plate margin peripherally but raised above it centrally. Mnciferous bodies numerous, scattered in the cytoplasm near the surface.

Farinacci & Howe catalog pages:
Chrysochromulina acantha

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: definite Chrysochromulina

Chrysochromulina acantha compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-7-2026 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=20078 Go to Archive.is to create a permanent copy of this page - citation notes

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