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.
Taxa are sorted alphabetically for simple browsing, or you can use search boxes at the top & bottom of the page
Current identification:
Compiled data
Original Description
Etymology:
Extra details from original publication
Light microscope observations
The cells had an oblong to spherical shape with lengths between 8 and 20 µm and widths between 8 and 16 µm (Figs 3– 6). The haptonema (12–15 µm) was inserted apically between two (rarely four) apparently equal flagella (12–23 µm) (Figs 4, 5). Cells had the anterior end obliquely truncated, slightly dorsoventrally compressed, and two or four golden brown oblong parietal chloroplasts (Figs 3–7). In preparations warmed in the microscope or upon fixation the cells became rounded and deteriorated rapidly (Fig. 5). The cells had undulated or rugged outlines (Fig. 6) visible with phase contrast µm optics due to the characteristic scales with two horn-like projections.
Electron microscope observations
The periplast was covered by two types of plate scales differing mainly in size, both visible in the shadow-cast preparation (Fig. 8, arrow, arrowhead). The dimensions of the two scale types are given in Table 1. Large scales were 2.1–3.2 3 1.6–2.3 µm, small scales 1.6–2.0 3 1.2–1.9 µm. The rim was upright or collapsed in some areas of the scales and had fine concentric striations (Figs 9, 10). The width of the rim was 0.3–0.6 µm for the large scales and 0.1–0.2 µm for the small scales. Large scales had considerably diverging relatively long (0.5–0.9 µm) horn-like projections (Fig. 10). Two horn-like projections of large scales were connected by a curved bridge of material extending across the scale centre. The small scale had two slightly diverging relatively short (0.2–0.4 µm) horn-like projections, which were connected by a straight or slightly curved bridge extended across the scale centre (Fig. 11). The distance between the bases of horn-like projections was 0.5–0.9 µm for large scales, and 0.3–0.4 µm for small scales. The pattern created by the radiating ribs divided the scales into four quadrants in both scale types (Figs 9–11). Both scale faces had radiating ribs arranged in quadrants (52–64 for the large scales and 49–57 for the small scales). The molecular signature of our isolate (Fig. 12) and some morphological features (oblong to spherical cell shape, haptonema approximately equal in length to flagella, and plate scales with radiating ribs on both faces) indicated its systematic affiliation with the genus Pseudohaptolina.
Orlova, T. Y, Efimova, K. V. & Stonik, I. V. (2016). Morphology and molecular phylogeny of Pseudohaptolina sorokinii sp. nov. (Prymnesiales, Haptophyta) from the Sea of Japan, Russia. Phycologia. 55(5): 506-514. gsReferences:
![]() |
Pseudohaptolina sorokinii: Catalog entry compiled by Jeremy Young. Viewed: 17-2-2025
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=54777 Go to Archive.is to create a permanent copy of this page - citation notes |
![]() |