The Lower-Middle Cambrian animal Rhabdotubus is the earliest known pterobranch. It bears strong similarity to the graptolites - indeed for some time it was misclassified as a dendroid graptolite.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rhabdotubus".
Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.