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Discoaster

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Cenozoic Taxa

Discoaster acutus Bown, 2005

Edited by Jeremy Young on Wed, 26/01/2011 - 12:55

Description: Typically six rayed, stellate (star-shaped) discoaster with relatively long, tapering free rays comparable in length to the central area width. The central area has inter-ray ridges and a small but prominent central boss on one side. The rays look rather ragged and somtimes appear to be asymmetrically arranged.

Remarks:

Range: NP9 to NP10.

Discoaster multiradiatus Bramlette & Riedel, 1954

Edited by Paul Bown on Wed, 21/04/2010 - 13:24

Description: Large to very large rosette-shaped discoasters with 16-35 rays joined along most of their length with simple ray tips.

Remarks:

Range: NP9 to NP11.

Discoaster mohleri Bramlette & Percival, 1971

Edited by Paul Bown on Wed, 21/04/2010 - 13:20

Description: Medium sized rosette-shaped discoasters with 9-16 rays joined along most of their length with simple broad ray tips.

Remarks:

Range: NP7 to NP9.

Discoaster mediosus Bramlette & Sullivan, 1961

Edited by Paul Bown on Wed, 21/04/2010 - 13:18

Description: Eight to ten near-parallel-sided rays with rounded to pointed tips that radiate with little free length from a large circular central area. May show inter-ray ridges, a low central boss, and the development of nodes towards the ray tips.

Remarks: Discoaster mediosus and Discoaster binodosus intergrade but can be distinguished as follows: D. mediosus usually has ten rays or more, with free rays less than half the length of the central area; D. binodosus usually has 8 rays with longer free length and prominent lateral nodes and pointed ray tips.

Range: NP7 to NP10.

Discoaster martinii Stradner, 1959

Edited by Paul Bown on Wed, 21/04/2010 - 13:16

Description: Usually very large, stellate discoaster with 5 rays that have wide bifurcate ray tips.

Remarks:

Range: NP15 to NP16.

Discoaster mahmoudii Perch-Nielsen, 1981

Edited by Paul Bown on Wed, 21/04/2010 - 13:14

Description: 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.

Discoaster lodoensis Bramlette & Riedel, 1954

Edited by Paul Bown on Wed, 21/04/2010 - 13:12

Description: Large to very large stellate discoasters with a central boss on one side and 5-7 (typically 6) curving rays joined along 1/2 to 1/3 their length with a ridge on one side.

Remarks:

Range: NP12 to NP14.

Discoaster lenticularis Bramlette & Sullivan, 1961

Edited by Paul Bown on Wed, 21/04/2010 - 13:07

Description: Medium sized rosette-shaped discoasters with thickened central area and 20-26 rays joined along their length with simple, blunt ray tips.

Remarks:

Range: NP9 to NP10.

Discoaster kuepperi Stradner, 1959

Edited by Paul Bown on Wed, 21/04/2010 - 13:04

Description: Medium sized rosette-shaped discoasters with very large flaring boss on one side and 8-12 rays joined along most of their length with simple ray tips.

Remarks:

Range: NP11 to NP14.

Discoaster falcatus Bramlette & Sullivan, 1961

Edited by Paul Bown on Wed, 21/04/2010 - 12:31

Description: Large to very large stellate discoasters with a low boss on one side and 7-10 (commonly 9) curving rays joined along half their length with a ridge on one side.

Remarks:

Range: NP8 to NP10.

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