A revision and reclassification of the Discorbidae, Rosalinidae, and Rotaliidae
Hansen, H.J.; Revets, S.A. (1992). A revision and reclassification of the Discorbidae, Rosalinidae, and Rotaliidae. Journal of Foraminiferal Research 22(2): 166-180
In: Journal of Foraminiferal Research. Cushman Foundation for Foraminiferal Research: Washington. ISSN 0096-1191; e-ISSN 1943-264X, more
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| Authors | | Top |
- Hansen, H.J.
- Revets, S.A., more
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| Abstract |
The recent turmoil in the taxonomy of the Discorbacea led us to investigate the internal morphology and structure of taxa at the center of the controversy. The type species of Discorbis, D. vesicularis Lamarck, 1804, is structurally a rotaliid, showing that the concept of Discorbis is unsupported by its type species. In order to stabilize the family-group taxa involved, we synonymize the family Discorbidae Ehrenberg, 1838 into the Rotaliidae Ehrenberg, 1839, because its type species has been misunderstood whereas that of the latter is well established. The genus Discorbis is retained with D. vesicularis as its type species, and Discorbina is reinstated with D. turbo as its type species. The original concept of Discorbis is well represented by Rosalina; we therefore support the reinstating of the Rosalinidae Reiss, 1963 as a replacement for the Discorbidae. Our structural study of their respective type species leads to the reclassification of Rotalia in the Rotaliinae, and of Ammonia, Discorbina, Discorbis, Lamellodiscorbis, Rotorbis, Rotorboides, and Strebloides in the Ammoniinae, Rotaliidae, Rotaliacea. The superfamily Eponidacea is proposed with Eponididae, Rosalinidae, and Alabaminidae as member taxa. Neoeponides is reclassified in the Eponididae, whereas Rosalina and Gavelinopsis are retained in the Rosalinidae. Planodiscorbis may belong to the Cibicididae, but not enough information is presently available to advocate a more definitive classification. Earlmyersia is also considered incertae sedis within the Rotaliacea. Tretomphalus is rejected from nomenclature since it is only a stage in the life cycle of an at present unknown benthic form. For the same reason, Tretomphaloides is synonymized into Neoconorbina. |
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