Dicrateria gilva


Classification: ntax_cenozoic -> Isochrysidales -> Isochrysidaceae -> Dicrateria -> Dicrateria gilva
Sister taxa: D. gilva, D. rotunda

Taxonomy:

Citation: Dicrateria gilva Parke 1949
Rank: Species

Original description: Diagnosis: Cellula sphaeroidi subovatave; 2 flagellis cellulae diametro 3-4 plo longioribus, ex granulo basali distincto exsistentibus; chromatophoris fulvis pallidis, plerumque contrapositis; 2 vacuolis parvis non trepidantibus ubi inserta sunt flagella fere sitis; nucleo laterali propius polum ilium sito ex quo exsistunt flagella; cellulae mobili est diametros 5-8 µm; cysto diametros 7-7-5 µm..

Similar in form to the previous species [D. inornata], but shows several points of difference. The motile stage is larger, measuring 5-8 µm in diameter, and appears to have a slightly less rigid periplast (Text-figs. 63, 66). No stigma is developed, but two small non-contractile vacuoles, lacking in the previous species, are present near the point of origin of the flagella; the chromatophores are paler in colour and possess a faint greenish tinge (PI. I, fig. 3; Text-figs. 62-64).

The flagella, arising from one distant basal granule (or two adjacent granules), are three to four times the cell diameter in length and are therefore much longer than in the previous species; neither flagellum shows a plumate structure as far as could be seen from stained preparations. The movement of this organism differs also from that of D. inornata; there are alternate periods of movement and quiescence, but when swimming it shows fairly rapid movement with frequent change of direction. The position of the flagella when the cell is both in motion and at rest is the same as in D. inornata, but the flagella are more rigid when at rest than in the former species. This species is also phototactic in reaction.

Type images:

Farinacci & Howe catalog pages: Dicrateria gilva

Search data:
TagsLITHS:
MetricsLith size: 0->0┬Ám;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): Extant Data source: present in the plankton
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY]

Plot of occurrence data:

References:

Parke, M. (1949). Studies on marine flagellates. Journal of the Marine Biological Association of the United Kingdom. 28: 255-288. gs


nannotaxlogo400px

Dicrateria gilva compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-4-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=438 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics