|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Pterobranchia - Diplograptoidea - Diplograptidae
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|C. E. Mitchell 1987||Aseptate, gradually widening rhabdosomes with narrow proximal end; slightly outwardly inclined amplexograptid thecae bearing a variably prominent genicular flange; primordial astogeny follows Pattern F; sicula is extensively exposed on the obverse side of the rhabdosome and bears paired antivirgellar spines in addition to the virgella. Thl1 mayor may not bear a mesial spine. Th 12 bears no spines.|