Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella
The evolutionary origin of Morozovella angulata from its immediate ancestor, Praemurica uncinata , is preserved in Paleocene sediments from the Gulf of Mexico. This event represents the beginning of the morozovellid radiation and marks the first appearance of keeled planktonic foraminifera after the...
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Language: | English |
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Cambridge University Press (CUP)
1996
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Online Access: | http://dx.doi.org/10.1017/s0094837300016213 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0094837300016213 |
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crcambridgeupr:10.1017/s0094837300016213 2024-09-15T18:31:01+00:00 Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella Kelly, D. Clay Arnold, Anthony J. Parker, William C. 1996 http://dx.doi.org/10.1017/s0094837300016213 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0094837300016213 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Paleobiology volume 22, issue 2, page 266-281 ISSN 0094-8373 1938-5331 journal-article 1996 crcambridgeupr https://doi.org/10.1017/s0094837300016213 2024-07-24T04:04:04Z The evolutionary origin of Morozovella angulata from its immediate ancestor, Praemurica uncinata , is preserved in Paleocene sediments from the Gulf of Mexico. This event represents the beginning of the morozovellid radiation and marks the first appearance of keeled planktonic foraminifera after the Cretaceous/Tertiary extinction. Parallel biometric and isotopic analyses were performed on size-segregated specimens from a succession of stratigraphic horizons. The biometric data reveal a temporal pattern of variation consistent with paedomorphosis. The appearance of angulose juvenile chambers in the otherwise rounded ancestral form ( Praemurica uncinata ) results in an allometry that becomes more pronounced upsection. At the origin of M. angulata , the juvenile morphology of the ancestor is retained throughout the entire ontogeny. Isotopic analysis of this sequence reveals the gradual acquisition of an increasingly heavy adult δ 13 C signal relative to that of the juvenile, while the δ 18 O data display no temporal or size-related trends. The temporal increase seen in the slope of the δ 13 C/size relationship may reflect the evolution of an increased dependency on photosymbionts. Article in Journal/Newspaper Planktonic foraminifera Cambridge University Press Paleobiology 22 2 266 281 |
institution |
Open Polar |
collection |
Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
The evolutionary origin of Morozovella angulata from its immediate ancestor, Praemurica uncinata , is preserved in Paleocene sediments from the Gulf of Mexico. This event represents the beginning of the morozovellid radiation and marks the first appearance of keeled planktonic foraminifera after the Cretaceous/Tertiary extinction. Parallel biometric and isotopic analyses were performed on size-segregated specimens from a succession of stratigraphic horizons. The biometric data reveal a temporal pattern of variation consistent with paedomorphosis. The appearance of angulose juvenile chambers in the otherwise rounded ancestral form ( Praemurica uncinata ) results in an allometry that becomes more pronounced upsection. At the origin of M. angulata , the juvenile morphology of the ancestor is retained throughout the entire ontogeny. Isotopic analysis of this sequence reveals the gradual acquisition of an increasingly heavy adult δ 13 C signal relative to that of the juvenile, while the δ 18 O data display no temporal or size-related trends. The temporal increase seen in the slope of the δ 13 C/size relationship may reflect the evolution of an increased dependency on photosymbionts. |
format |
Article in Journal/Newspaper |
author |
Kelly, D. Clay Arnold, Anthony J. Parker, William C. |
spellingShingle |
Kelly, D. Clay Arnold, Anthony J. Parker, William C. Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella |
author_facet |
Kelly, D. Clay Arnold, Anthony J. Parker, William C. |
author_sort |
Kelly, D. Clay |
title |
Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella |
title_short |
Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella |
title_full |
Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella |
title_fullStr |
Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella |
title_full_unstemmed |
Paedomorphosis and the origin of the Paleogene planktonic foraminiferal genus Morozovella |
title_sort |
paedomorphosis and the origin of the paleogene planktonic foraminiferal genus morozovella |
publisher |
Cambridge University Press (CUP) |
publishDate |
1996 |
url |
http://dx.doi.org/10.1017/s0094837300016213 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0094837300016213 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Paleobiology volume 22, issue 2, page 266-281 ISSN 0094-8373 1938-5331 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0094837300016213 |
container_title |
Paleobiology |
container_volume |
22 |
container_issue |
2 |
container_start_page |
266 |
op_container_end_page |
281 |
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1810472617548709888 |