Contribution à l’étude des graptolites du Llandoverien inférieur de l’Oued In Djerane (Tassili N’ajjer oriental, Sahara algérien)

Erdtmann's recently proposed classification of the Tremadoc dendroid graptolites and, in particular, the splitting of the genus Dictyonema into benthic (Dictyonema) in planktic (Rhabdinopora) forms are discussed. In view of the Jack of significant details concerning structure, especially in the type species, this distinction seems very premature.