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<p>Stolon systems of rhabdopleurid hemichordates with different branching patterns are described from the Late Cretaceous chalk of the island of Rügen, north-eastern Germany. These colonised secondary hardgrounds on the chalk seafloor, notably belemnite rostra and echinoid tests. As these rhabdopleurids have overgrown other organisms such as bryozoans, bivalves and octocoral bases, they appear to be the youngest colonisers of hard substrates within Chalk Sea habitat islands on the seafloor. Previous chemically isolated finds of pterobranch material are confirmed by these <i>in-situ</i> specimens, which are the first <i>in-situ</i> Pterobranchia from the Cretaceous worldwide.</p>

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First in-situ rhabdopleurids (Hemichordata) from the early Maastrichtian Rügen Chalk, Germany

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Mike Reich,
  • Hansjoachim Krümmer

摘要

Stolon systems of rhabdopleurid hemichordates with different branching patterns are described from the Late Cretaceous chalk of the island of Rügen, north-eastern Germany. These colonised secondary hardgrounds on the chalk seafloor, notably belemnite rostra and echinoid tests. As these rhabdopleurids have overgrown other organisms such as bryozoans, bivalves and octocoral bases, they appear to be the youngest colonisers of hard substrates within Chalk Sea habitat islands on the seafloor. Previous chemically isolated finds of pterobranch material are confirmed by these in-situ specimens, which are the first in-situ Pterobranchia from the Cretaceous worldwide.