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Catinaster
Cenozoic Taxa
Discoaster mahmoudii Perch-Nielsen, 1981
Edited by Paul Bown on Wed, 21/04/2010 - 12:14Description: Distinctive stellate discoaster with 5 or 6 tapering free rays and a central area crossed by high inter-ray ridges that form a stellate boss.
Remarks: Arms frequently broken off, leaving a Catinaster-like central area.
Range: NP9 to NP10.
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Neogene: Catinaster; Discoaster
Paleogene: Discoaster mahmoudii
Catinaster
Edited by Lyndsey on Thu, 10/03/2011 - 12:25Catinaster Martini and Bramlette, 1963
Description: Catinasters are rather curious sub-cylindrical or cup-shaped nannofossils. They have six-fold radial symmetry and the same crystallographic orientation as discoasters. There are two main species, C. coalitus which has septae-like radial structures confined to the cup, and C. calyculus in which radial structures extend beyond the cup. The cup was probably formed by fusion of the bifurcations of a small discoaster (Martini & Worsley 1971, Peleo-Alampay et al., 1988).
Remarks:
Type species: C. calyculus Martini & Bramlette 1963
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Neogene: Catinaster
Discoasteraceae
Edited by Lyndsey on Tue, 01/03/2011 - 15:12FAMILY DISCOASTERACEAE TAN, 1927
Description. Discoidal nannoliths of 3-40 elements radiating from a common centre. C-axes vertical, so nannoliths appear dark in plane-polarised light. Some early forms also include a cycle of birefringent units.
Taxa included: Discoaster, Catinaster.
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6-rayed discoasters with bifurcations. |
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Discoaster brouweri group 6-rayed discoasters without bifurcations, and forms closely related to D. brouweri with 3 to 5 rays |
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Discoaster pentaradiatus group symmetric 5-rayed discoasters |
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6-rayed discosters in which the birfurcations meet to form a rim, which extends proximally |
Original description:
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