|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Pterobranchia - Diplograptoidea
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.
|J. Maletz 2011||Biserial graptolites with a pattern U astogeny, a broad, fairly symmetrical proximal end and thecae with a rounded or flowing geniculum and incipient to well-developed lateral apertural lappets; manubrium structure lacking downward growth of thecae or lacking altogether; thecae long and double sigmoid in shape; infradorsal thecal walls vertical to outwardly inclined; apertural spines at least on first thecal pair, rarely on distal thecae; rhabdosome parallel-sided to distally widening.|