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Phyletic gradualism in the Globorotalia inflata lineage vindicated

Published online by Cambridge University Press:  08 April 2016

Björn A. Malmgren  and
James P. Kennett
Björn A. Malmgren
Affiliation:
Department of Paleontology, University of Uppsala, Box 558, S-751 22 Uppsala, Sweden
James P. Kennett
Affiliation:
Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island 02882
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Extract

We appreciate Dr. Scott's comments about our paper (Malmgren and Kennett 1981), but wish to clarify some aspects which we hope will help provide a better understanding about the Late Neogene evolution of the Globorotalia (Globoconella) group (Kennett and Srinivasan 1983). We also wish to dispute some of Scott's other criticisms. In effect, Scott's arguments have provided no reason to justify abandonment of our initial contention that this lineage represents one of the best documented cases of phyletic gradualism in any group of fossils.

We support Scott's notion that divergence of the lineage took place near the Miocene-Pliocene boundary, but this divergence is not relevant for our evolutionary study. In fact, the Early Pliocene form resembling Globorotalia conoidea was already recognized by one of us (J.P.K.) 10 yr ago (Kennett 1973). It was distinguished as G. cf. conoidea and not G. conoidea as stated by Scott. In our previous papers (Malmgren and Kennett 1981, 1982) we confined our attention to the evolution that occurred in the primary temperate stock (cool subtropical) water mass—the abundant and dominant forms of Globoconella.

Type
Articles
Information
Paleobiology , Volume 9 , Issue 4 , Fall 1983 , pp. 427 - 428
Copyright
Copyright © The Paleontological Society 

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References

Literature Cited

Arnold, A. J. 1982. A geometric analysis of evolutionary trends in the Globorotalia puncticulata lineage. (Abstract.) J. Paleontol. 56 (suppl. to no. 2, part 2):1.Google Scholar
Berggren, W. A. 1977. Late Neogene planktonic foraminiferal biostratigraphy of the Rio Grande Rise (South Atlantic). Mar. Micropaleontol. 2:265–313.CrossRefGoogle Scholar
Eldredge, N. and Cracraft, J. 1980. Phylogenetic Patterns and the Evolutionary Process. 349 pp. Columbia Univ. Press; New York.Google Scholar
Gould, S. J. and Eldredge, N. 1977. Punctuated equilibria: the tempo and mode of evolution reconsidered. Paleobiology. 3:115–151.Google Scholar
Hornibrook, N. de B. 1982. Late Miocene to Pleistocene Globorotalia (Foraminiferida) from DSDP Leg 29, Site 284, southwest Pacific. N.Z. Jl. Geol. Geophys. 25:83–99.CrossRefGoogle Scholar
Jenkins, D. G. 1971. New Zealand Cenozoic planktonic foraminifera. 278 pp. N.Z. Geol. Surv. Paleontol. Bull. 42.Google Scholar
Jenkins, D. G. 1975. Cenozoic planktonic foraminiferal biostratigraphy of the southwestern Pacific and Tasman Sea—DSDP Leg 29. In: Kennett, J. P. et al., eds. Initial Reports of the Deep Sea Drilling Project. 29:449–467.Google Scholar
Kennett, J. P. 1966. The Globorotalia crassaformis bioseries in north Westland and Marlborough. Micropaleontol. 12:235–245. 245.CrossRefGoogle Scholar
Kennett, J. P. 1973. Middle and late Cenozoic planktonic foraminiferal biostratigraphy of the southwest Pacific—DSDP Leg 21. In: Burns, R. E. et al., eds. Initial Reports of the Deep Sea Drilling Project. 21:575–639.Google Scholar
Kennett, J. P. and Srinivasan, M. S. 1983. A Phylogenetic Atlas of Neogene Planktonic Foraminifera. 265 pp. Hutchinson & Ross; Stroudsburg, Pa.Google Scholar
Kennett, J. P. and Vella, P. 1975. Late Cenozoic planktonic foraminifera and paleoceanography at DSDP Site 284 in the cool subtropical south Pacific. In: Kennett, J. P. et al., eds. Initial Reports of the Deep Sea Drilling Project. 29:769–799.Google Scholar
Kennett, J. P. and Watkins, N. D. 1974. Late Miocene-Early Pliocene paleomagnetic stratigraphy, paleoclimatology, and biostratigraphy in New Zealand. Geol. Soc. Am. Bull. 85:1385–1398.Google Scholar
Kennett, J. P. and Others. 1983. Deep Sea Drilling Project Leg 90—the South Pacific Cenozoic. Nature. 303:18–19.Google Scholar
Malmgren, B. A. and Kennett, J. P. 1981. Phyletic gradualism in a late Cenozoic planktonic foraminiferal lineage; DSDP Site 284, southwest Pacific. Paleobiology. 7:230–240.Google Scholar
Malmgren, B. A. and Kennett, J. P. 1982. The potential of morphometrically based phylozonation: application of a Late Cenozoic planktonic foraminiferal lineage. Mar. Micropaleontol. 7:285–296.CrossRefGoogle Scholar
McInnes, B. A. 1965. Globorotalia miozea Finlay as an ancestor of Globorotalia inflata (d'Orbigny). N.Z. Jl. Geol. Geophys. 8:104–108.Google Scholar
Prothero, D. R. and Lazarus, D. B. 1980. Planktonic microfossils and the recognition of ancestors. Syst. Zool. 29:119–129.CrossRefGoogle Scholar
Ryan, W. B. F., Cita, M. B., Dreyfus Rawson, M., Burckle, L. H., and Saito, T. 1974. A paleomagnetic assignment of Neogene stage boundaries and development of isochronous datum planes between the Mediterranean, the Pacific and Indian Oceans in order to investigate the response of the world oceans to the Mediterranean “salinity crisis”. Riv. Ital. Paleontol. Strat. 80:631–687.Google Scholar
Scott, G. H. 1979. The late Miocene to early Pliocene history of the Globorotalia miozea plexus from Blind River, New Zealand. Mar. Micropaleontol. 4:341–361.Google Scholar
Scott, G. H. 1980. Globorotalia inflata lineage and G. crassaformis from Blind River, New Zealand: recognition, relationship, and use in uppermost Miocene-lower Pliocene biostratigraphy. N.Z. Jl. Geol. Geophys. 23:665–677.Google Scholar
Scott, G. H. 1982. Tempo and stratigraphic record of speciation in Globorotalia puncticulata. J. Foram. Res. 12:1–12.CrossRefGoogle Scholar
Scott, G. H. 1983a. Biostratigraphy and histories of upper Miocene-Pliocene Globorotalia, South Atlantic and South West Pacific. Mar. Micropaleontol. 7:369–383.CrossRefGoogle Scholar
Scott, G. H. 1983b. Review of Kapitean stratotype and boundary with Opoitian Stage (upper Neogene, New Zealand). N.Z. Jl. Geol. Geophys. 25:475–485.Google Scholar
Srinivasan, M. S. and Kennett, J. P. 1981. Neogene planktonic foraminiferal biostratigraphy and evolution: equatorial to subantarctic, South Pacific. Mar. Micropaleontol. 6:499–533.Google Scholar
Stainforth, R. M., Lamb, J. L., Luterbacher, H., Beard, J. H., and Jeffords, R. M. 1975. Cenozoic planktonic foraminiferal zonation and characteristics of index forms. 425 pp. Paleontol. Contr. Univ. Kansas. art. 62.Google Scholar
Walters, R. 1965. The Globorotalia zealandica and G. miozea lineages. N.Z. Jl. Geol. Geophys. 8:109–127.Google Scholar