Centropyxis Stein, 1859
publication ID |
https://doi.org/ 10.26879/1082 |
persistent identifier |
https://treatment.plazi.org/id/039B87F8-0C7B-FFCE-E020-FBD6D7627B1C |
treatment provided by |
Felipe |
scientific name |
Centropyxis Stein, 1859 |
status |
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Genus Centropyxis Stein, 1859 View in CoL View at ENA (ref. Patterson, R. T. and Kumar, A. 2002, Palaeo 3, 180:225-251)
Type Species. Centropyxis aculeata (Ehrenberg, 1832) ( Figures 5 View FIGURE 5 , 6.1 View FIGURE 6 )
Description. Test bilaterally symmetrical, outline subcircular to ovoid; shell composed of proteinaceous matrix with agglutinated mineral grains and diatom frustules; aperture sub-terminal or eccentric, invaginated, with multiple spines (Ellison and Ogden, 1987). In the present assemblage, some spines are intact but many are often broken, vary between two to five or sometimes more, and test size varies between 60 µm to 75 µm.
Diatoms
Many well-preserved frustules of pennate and centric diatoms were found attached on the Centropyxis aculeata tests . Diatoms could be identified only to the genus level because the central area, valve face or margins were often difficult to observe ( Figure 6 View FIGURE 6 ). Therefore, identification was assigned to the generic level, and species names are tentative and presented in parentheses with a question mark. The observed centric diatoms are Cyclotella sp. , Aulacoseira sp. , and Pantocsekiella sp. ; pennate diatoms include Achnanthes sp. Diadesmis sp. , and Oricymba sp.
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