Abstract
The retiolite graptolites can be divided into at least two major groups, each derived independently from diplograptid ancestors. The lacinia of some Ordovician forms, and the ancora and ancora sleeve (‘reticulum’) of Silurian retiolites, are both novel structures. Some other retiolite taxa lacking these structures are best grouped within diplograptid families. The nomenclature of retiolite structures is discussed.
This content is PDF only. Please click on the PDF icon to access.
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
