Nannotax3 - ntax_Farinacci - Chrysochromulina mantoniae

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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Citation: Chrysochromulina mantoniae Leadbeater 1972

Type specimens: Type drawing Fig. 2

Type sample (& lithostrat): Found on 11 August 1970 in a sea water sample taken from a depth of 5 m

Standardised type level: 160_HOLOCENE

Type locality: approximately 30 km NW of Bergen, Norway

Farinacci catalog page (& compiler): n/a

Current citation: Chrysochromulina mantoniae Leadbeater 1972

Cell subcylindrical, 6 µm long and 3 µm wide; flagella 2 equal, 18-20 µm long and a haptonema 10 µm long when extended. Scales of three types, small oval plates, 0.5 µm long X 0.4 µm wide, with a conspicuous rim, 0.1 µm wide, flexed towards the distal surface and a pattern of radiating ridges visible only on the proximal surface; distal surface, plane. Large oval plate scales 1.5 µm long X 1.1 µm wide with a peripheral ridge and a pattern of radiating striations visible on both surfaces. A small number of spine scales at each end of the cell, length 6.0 µm, diameter of base 1.1 µm with an apiculate tip.

Cellula subcylindrica, 6 µm longa, 3 µm lata; flagella 2 aequalia 18-20 f£m longa; haptonema extensum 10 µm longum. Squamae trimorphae, aliae minores, aliae majores, paucae anticae et posticae spinigerae. Squama minor 0.5 µm longa, 0.4 µm lata, cingulo mam/esto 0.1 µm lato extrorso marginata, carinis radiantibus e facie interiore visibilibus ornata, extra plana. Squama major 1.5 µm longa, 1.1 µm lata, carina marginali striisque radiantibus utrinque visibilibus ornata. Squama spinigera 6.0 µm longa, basi 1.1 µm diam., apiculata.

The specific epithet mantoniae has been chosen as a mark of appreciation of the great contribution that Professor I. MANTON, F.R.S. has made to the study of flagellates in general and the genus Chrysochromulina in particular.

C. mantoniae was occasionally found in plankton samples from Hjeltefjorden and frequently from Herdlefjorden (for further details see LEADBEATER 1972).

The subcylindrical cell, approximately 6 µm long and 3 µm wide, possesses two flagella and a shorter haptonema (Figs. 2, 35). This species is recognised in shadowcast whole mounts by the stout spine-scales located at either end of the cell retained only at the posterior ends in Figs. 35, 36. Rimmed plate scales of two types cover the surface of the cell. The underlayer consists of many small oval plates each with a pattern of radiating ridges on its proximal surface (Figs. 37-39).

The distal surface, bordered by a strongly inflexed wide rim, displays an irregular arrangement of fibres but on most scales these are obscured by a deposit, possibly of mucilage (Figs. 38, 39).

The larger plate scales of the outer layer exhibit on their proximal surfaces a pattern of radiating ridges arranged in quadrants superimposed on concentric lines (Figs. 37, 38 left). A similar pattern can also be seen on the distal surface but it is partially obscured by other irregularly arranged markings (Fig. 38 right).

Each plate is bordered by a raised edge on the proximal surface and a small rim on the distal surface (Figs. 37, 38).

The spine scales usually occur in groups of three or more at either end of the cell although they are often dislodged during the preparation of dried whole mounts. Each spine has a rounded base and a shaft with prominent ridges which enlarge towards the base (Figs. 36, 40). The ridges taper towards the distal end and the spine terminates in an apiculate tip (Fig. 40 inset).

References:

Leadbeater, B. S. C. (1972a). Fine structural observations on six new species of Chrysochromulina (Haptophyceae) from Norway with preliminary observations on scale production in C. microcylindra sp. nov. Sarsia. 49: 65-80. gs

Leadbeater, B. S. C. (1972b). Identification, by means of electron microscopy, of nanoplankton flagellates from the coast of Norway. Sarsia. 49: 105-132. gs

CATALOG - Chrysochromulina mantoniae

References:

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