Wear, tear and systematic repair: testing models of growth dynamics in conodonts with high-resolution imaging

Journal article
(Original article)


Publication Details

Author(s): Shirley B, Grohganz M, Bestmann M, Jarochowska E
Journal: Proceedings of the Royal Society B-Biological Sciences
Publisher: ROYAL SOC
Publication year: 2018
Volume: 285
Journal issue: 1886
ISSN: 0962-8452


Abstract

Conodont elements are the earliest mineralized vertebrate dental tools and the only ones capable of extensive repair. Two models of conodont growth, as well as the presence of a larval stage, have been hypothesized. We analysed normally and pathologically developed elements to test these hypotheses and identified three ontogenetic stages characterized by different anisometric growth and morphology. The distinction of these stages is independently corroborated by differences in tissue strontium (Sr) content. The onset of the last stage is marked by the appearance of wear resulting from mechanical food digestion. At least five episodes of damage and repair could be identified in the normally developed specimen. In the pathological element, function was compromised by the development of abnormal dent ides. This development can be reconstructed as addition of new growth centres out of the main growth axis during an episode of renewed growth. Our findings support the model of periodic retraction of elements and addition of new growth centres. Changes in Sr content coincident with distinct morphology and lack of wear in the early life stage indicate that conodonts might have assumed their mature feeding habit of predators or scavengers after an initial larval stage characterized by a different feeding mode.


FAU Authors / FAU Editors

Bestmann, Michel Dr.
Lehrstuhl für Endogene Geodynamik
Jarochowska, Emilia Dr.
Lehrstuhl für Paläoumwelt
Shirley, Bryan
Lehrstuhl für Paläoumwelt


How to cite

APA:
Shirley, B., Grohganz, M., Bestmann, M., & Jarochowska, E. (2018). Wear, tear and systematic repair: testing models of growth dynamics in conodonts with high-resolution imaging. Proceedings of the Royal Society B-Biological Sciences, 285(1886). https://dx.doi.org/10.1098/rspb.2018.1614

MLA:
Shirley, Bryan, et al. "Wear, tear and systematic repair: testing models of growth dynamics in conodonts with high-resolution imaging." Proceedings of the Royal Society B-Biological Sciences 285.1886 (2018).

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Last updated on 2018-28-10 at 09:23