Brombacher, Anieke;
Poole, Christopher R;
Ezard, Thomas HG;
Wade, Bridget S;
(2024)
Heterochrony in the evolution of the planktonic foraminifer Globigerinoidesella fistulosa from the Trilobatus sacculifer plexus.
Paleobiology
, 50
(4)
pp. 582-591.
10.1017/pab.2024.23.
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Abstract
Planktonic foraminifera are extremely well suited to studying evolutionary change in the fossil record due to their abundant deposits and global distribution. Species are typically conservative in their shell morphology, with the same geometric shapes appearing repeatedly through iterative evolution, but the mechanisms behind the architectural limits on foraminiferal shell shape are still not well understood. To determine how these developmental constraints arise, we study morphological change leading up to the origination of the unusually ornate species Globigerinoidesella fistulosa. We measured the size and circularity of more than 900 specimens of G. fistulosa, its ancestor the Trilobatus sacculifer plexus, and intermediate forms from a site in the western equatorial Pacific. Our results show that the origination of G. fistulosa from the T. sacculifer plexus involved a combination of two heterochronic expressions: earlier onset of protuberances (pre-displacement) and a steeper allometric slope (acceleration) as compared with its ancestor. Our work provides a case study of the complex morphological and developmental changes required to produce unusual shell shapes and highlights the importance of developmental deviations in evolutionary origination.
| Type: | Article |
|---|---|
| Title: | Heterochrony in the evolution of the planktonic foraminifer Globigerinoidesella fistulosa from the Trilobatus sacculifer plexus |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1017/pab.2024.23 |
| Publisher version: | https://doi.org/10.1017/pab.2024.23 |
| Language: | English |
| Additional information: | This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10206133 |
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