|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
It was corrected as Orbigniana by Barras (2007).
It was assigned to Pygorhytinae by Jesionek-Szymanska (1963); to Collyritidae by Wagner and Durham (1966); to Disasteroida by Sepkoski (2002); and to Atelostomata by Barras (2007).
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. G. Barras 2007||Stem group Atelostomata with an elongate disjunct apical disc. The disc contains a number of complemental plates that preclude the direct contact of oculars II and IV and also of genitals 1 and 4 (Fig. 4D). The disc trivium and bivium are joined by a short string of complemental plates, similar in size to the genitals. The genus retains the primitive periproctal groove (Pl. 1, fig. 6a) and also phyllodes (Fig. 10F) and a peristomial well (Pl. 1, fig. 6b).|