|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Pterobranchia - Bireclinata - Lasiograptidae
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.
|H. B. Whittington 1954||Sicula, initial bud and proxi- mal part of th 11, th 21 and th 12 with continuous periderm, remainder of rhabdosome represented by clathria only, rectangular in cross section. Virgula forms central longitudinal strand of lattice on obverse side. Thecae of orthograptid type with straight ventral wall, alternating, overlapping about one-fifth of their length. Development of non-septate diplograptid.|