Nannotax3 - ntax_Farinacci - Pavlova calceolata Nannotax3 - ntax_Farinacci - Pavlova calceolata

CATALOG - Pavlova calceolata


Folder trail: ntax_Farinacci -> Haptophytes -> Pavlova -> Pavlova calceolata
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 calceolata van der Veer 1976

Compiled data

Citation: Pavlova calceolata van der Veer 1976
Taxonomic rank: species
Type locality: Type collected 20 May 1967, south of St Germans, in a saltmarsh alongside a tributary of the Lynher River, Cornwall, England, culture no. 6757 (Van der Veer).
Farinacci catalog page (& compiler): n/a
Current citation: Pavlova calceolata van der Veer 1976


Original Description

Cells motile or palmelloid. Motile cells solitary, not metabolic, slipper-shaped, in dorsal view oblong, obovate or weakly pear-shaped, dorsoventrally compressed, (5-)6-9 x 3½-6 x 2½-3 µm. On the ventral side a depression a short distance from the anterior pole and extending to one-third or half the length of the cell and continued in posterior direction by an indistinct furrow.
Two unequal heterodynamic flagella and a thin haptonema arising ventrally close together from the posterior part of the depression. One flagellum 6-10 ≤m long, in rest sinuately coiled, clad with very small stellate particles and long spreading hairs. The other flagellum 2-3 µm long, generally flexed backwards, with long spreading hairs. Haptonema 1-2 µm long. A single chloroplast, parietal, pale yellow-green, with four lobes projecting from the dorsally positioned isthmus, and with an eyespot on the edge near the flagellar insertion.
A pit entering the cell near the base of the long flagellum, terminating in a globose sac.
Two vacuoles with reserve materials in the posterior part of the cell.
Dome-shaped vesicles of varying size irregularly distributed in the outer layer of cytoplasm.

Extra details from original publication
Taxonomic relationships: Salient features that the new species has in common with Pavlova gyrans, the type of the genus, are found in the flagellar apparatus. Consideration of intra-generic kinship between these two organisms is invited especially by the flagellar hairs and minute particles on the propulsive flagellum, and by the details of the microtubular root. But there are differences, the significant ones being summarized in Table l. In fact, the homogeneity of the genus will be weakened by the incorporation of P. calceolata, which does not have extraneous body-particles nor a pyrenoid as do the other electron-optically studied species, P. gyrans (Green & Manton, 1970), P. mesolychnon (Van der Veer, 1969), P. granifera (Mack) (Green, 1973), P. helicata (Van der Veer, 1972).

TABLE 1. DIFFERENCES BETWEEN P. calceolata and P. gyrans            
Pavlova gyrans Pavlova calceolata
Flagellar particles with median constriction Flagellar particles stellate
Body particles nearly spherical Body particles absent
Chloroplast bilobed, flexed Chloroplast tetralobed
Pyrenoid present Pyrenoid absent
Stigma inwardly facing Stigma outwardly facing
Pit: tube-shaped, curved towards stigma Pit: a narrow canal with globose ending, not associated with stigma

References:

Van Der Veer, J. (1976). Pavlova calceolata (Haptophyceae), a new species from the Tamar Estuary, Cornwall, England. Journal of the Marine Biological Association of the United Kingdom. 56: 21-30. gs


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

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