Miniaturization during a Silurian environmental crisis generated the modern brittle star body plan

Ben Thuy, Mats E. Eriksson, Manfred Kutscher, Johan Lindgren, Lea D. Numberger-Thuy, David F. Wright

Research output: Contribution to journalArticlepeer-review


Pivotal anatomical innovations often seem to appear by chance when viewed through the lens of the fossil record. As a consequence, specific driving forces behind the origination of major organismal clades generally remain speculative. Here, we present a rare exception to this axiom by constraining the appearance of a diverse animal group (the living Ophiuroidea) to a single speciation event rather than hypothetical ancestors. Fossils belonging to a new pair of temporally consecutive species of brittle stars (Ophiopetagno paicei gen. et sp. nov. and Muldaster haakei gen. et sp. nov.) from the Silurian (444–419 Mya) of Sweden reveal a process of miniaturization that temporally coincides with a global extinction and environmental perturbation known as the Mulde Event. The reduction in size from O. paicei to M. haakei forced a structural simplification of the ophiuroid skeleton through ontogenetic retention of juvenile traits, thereby generating the modern brittle star bauplan.

Original languageEnglish
Article number14
JournalCommunications Biology
Issue number1
Publication statusPublished - 2022

Subject classification (UKÄ)

  • Geology


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