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Diagnostic Features
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- Test thin-plated; ovate with shallow anterior sulcus; posterior face with slight subanal heel.
- Apical disc with four gonopores; anterior genital plates not fused. Posterior ocular plates disjunct and separated from the posterior genital plates.
- Ambulacra all similar; flush; pore-pairs rudimentary; apetaloid.
- Peristome circular and moderately far removed from the anterior border; not depressed.
- Plastron plating orthosternous with labral plate followed by a single large sternal plate then a pair of small, near symmetical episternal plates. No rostral plate.
- Periproct on steeply sloping posterior face; ovate.
- Aboral tuberculation fine.
- Subanal fasciole present.
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Distribution
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Late Cretaceous (Maastrichtian) to early Tertiary (Danian) of Madagascar and Dagestan. |
| Name gender |
masculine |
| Type |
Basseaster rostratus Lambert, 1936, p. 25, by original designation. Holotype: Museum National d'Histoire Naturelle, Paris J00920. |
| Species Included |
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| Classification and/or Status |
Holasteroida, Meridosternata, Urechinina stem-group.
Monotypic.
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| Remarks |
Most similar to Garumnaster, but distinguished from that taxon by having four gonopores and a shallow frontal groove. Galeaster has a deeper frontal groove, fused anterior genital plates and elongate episternal plates.
Smith, A. B. & Jeffery, C. H. 2000. Maastrichtian and Palaeocene echinoids: a key to world faunas. Special Papers in Palaeontology 63, 1-404.
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