A chronocladogeny and corresponding classification of Neogene planktic foraminifera with a documentation of morphotypes from two Pacific deepsea stratigraphic sections
Two deepsea stratigraphic sections with highly complete oozes from the Middle Miocene to Pleistocene, located on the north Lord Howe Rise and the east equatorial Pacific, have been sampled at coarse intervals. Large assemblages of planktic foraminifera, recovered from each sample, have been examined...
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| Format: | Other/Unknown Material |
| Language: | unknown |
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| Online Access: | http://hdl.handle.net/1885/9007 https://doi.org/10.25911/5d78dc8e7ba05 https://openresearch-repository.anu.edu.au/bitstream/1885/9007/4/Fordham_Chronocladogeny1979.pdf.jpg |
| Summary: | Two deepsea stratigraphic sections with highly complete oozes from the Middle Miocene to Pleistocene, located on the north Lord Howe Rise and the east equatorial Pacific, have been sampled at coarse intervals. Large assemblages of planktic foraminifera, recovered from each sample, have been examined to determine sets of morphologically intragrading fossil populations and morphologically distinctive individuals, i.e. morphotypes. Each fossil population is interpreted as a remnant of ancient sets of interbreeding living populations, i.e. species. On the basis of previous literature on morphotype phylogeny, a cladogeny with biostratigraphic control is constructed and transferred to a chronologic scale. This chronocladogeny is tentatively extended to the base of the Tertiary and integrated into a phylogenetic scheme for planktic foraminifera, starting with their Triassic origin. A classification is derived from the cladogeny by assigning each segment to the rank of species and recognizing all possible multitypic and necessary monotypic taxa. Of the supraspecific taxa generated, only genus-group categories are formalized. The following taxa are introduced: Streptochilus tokelauae flexiserialis n.subsp., S. globiger infirmirugosus n.subsp., Tenuitella postcretacea pieste n.subsp., Toddella n.gen., T. grata compressa n.subsp., Tinophodella (Tenuirotalia) n.subgen., T. (T.) praemonita n.sp., T. (T.) praemonita praemonita n.subsp., T. (T.) praemonita tetrapetala n.subsp., T. (T.) praemonita tripetala n.subsp., T. (Parkerina) n.subgen., T. (Tinophodella) antarctica polypetala n.subsp., T. (T.) evoluta n.sp., T. (T.) evoluta evoluta n.subsp., T. (T.) uvula quasifoliata n.subsp., Globorotaloides (Bandyus) n.subgen., G. (B.) relizensis extraumbilicata n.subsp., G. (Globorotaloides) variabilis anasuteri n.subsp., G. (G.) dinapoli redissimilis n.subsp., G. (G.) dinapoli anavenezuelana n.subsp., Globoquadrina (Globoquadrina) tripartita laxispira n.subsp., G. (G.) tripartita tricamerata n.subsp., G. (Neoacarinina) conglomerata ... |
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