Nannotax3 - ntax_Farinacci - Pavlova gyrans Nannotax3 - ntax_Farinacci - Pavlova gyrans

CATALOG - Pavlova gyrans


Folder trail: ntax_Farinacci -> Haptophytes -> Pavlova -> Pavlova gyrans
Folders this level: P. calceolata, P. ennorea, P. gyrans, P. helicata, P. pinguis, P. salina, P. virescens, P. viridis

Original descriptions of taxa. For coccolithophores, and many calcispheres, these are pages from the Farinacci & Howe Catalog of Calcareous Nannofossils. In other cases (e.g. non-calcifying haptophytes) the data is directly compiled on this site. The "Catalogue of Calcareous Nannofossils" was originally compiled by Prof A. Farinacci 1969-1989, since 2000 it has been updated and extended by Richard Howe - see The Farinacci and Howe Catalog - an Introduction.
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Current identification/main database link: Pavlova gyrans Butcher 1952; emend. Green and Manton 1970

Compiled data

Citation: Pavlova gyrans Butcher 1952; emend. Green&Manton 1970
Taxonomic rank: species
Type locality: Isolated from the Relford River, Cornwall, in I947.
Farinacci catalog page (& compiler): n/a
Current citation: Pavlova gyrans Butcher 1952; emend. Green and Manton 1970


Original Description

Cells strongly metabolic, either elongated, ovoid or amoeboid, usually compressed, base acute; chromatophores two, large, lateral, not extending to the base, dull yellow, granular; flagella two, unequal and inserted at some distance below the apex, the larger directed towards the apex and the shorter outwards; a conspicuous red stigma and a small contracting vacuole are present in the apical region; at the posterior end one to three leucosin bodies are present.
Propagation is by longitudinal division in the non-motile stage.

Size:
Cells 3-6 µm x 4-10 µm

Extra details from original publication
This flagellate is most closely allied to the metabolic forms of Ochromonas, but differs in the sublateral insertion of the flagella,a character deemed of sufficient importance to separate it from this genus.

The metabolism of the individuals is so marked and the shape so varied that the form of the cells is anything 'from cylindrical compressed to almost spherical and amoeboid. Only the most frequently observed shapes are illustrated (Pl. II, Figs. 35-38).

Of the two flagella the one directed forward has a somewhat slow undulatory motion and can be seen without difficulty. It is about twice as long as the cell. The smaller flagellum is directed outwards and has a rapid up and down movement; in length it about equals the width of the cell and is very much more difficult to detect than the longer flagellum. The movements of the organism are very varied. Sometimes it twists and turns on its own axis, or goes forward with a vibratory motion, while at other times it moves rapidly in one direction. Or it may execute a combination of any of these movements.

A palmelloid state has been occasionally observed in cultures. The outline of the cells is then very irregular, but stigma and leucosin are very conspicuous.

The cells are very sensitive to all fixatives, in which they either become  or burst. In excess light on the microscope slide the cells behave as follows. Motion ceases and the elongate cells become oval or spherical, the long flagellum floats away and part of the hyaline contents of the cell is extruded through the periplast to form elongate or club-shaped' pseudopodia'. Some individuals do not immediately lose their power of motion but continue to move with pseudopodia protruding. Apparently this form of the organism may best be considered a pathological condition.

References:

Butcher, R. W. (1952). Contributions to our knowledge of the smaller marine algae. Journal of the Marine Biological Association of the United Kingdom. 31: 175-191. gs


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Pavlova gyrans: Catalog entry compiled by Jeremy Young. Viewed: 17-2-2025

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