|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Cephalopoda - Ellesmerocerida
It was corrected as Ellesmerocerida by Teichert et al. (1964), Sepkoski (2002), Evans (2005), Kröger and Mutvei (2005), Evans (2011), Kröger and Evans (2011) and Kröger and Lefebvre (2012).
It was assigned to Nautiloidea by Unklesbay and Young (1956), Flower (1964), Teichert et al. (1964), Evans (2005) and Evans (2011); and to Cephalopoda by Sepkoski (2002), Kröger and Mutvei (2005), Kröger and Evans (2011) and Kröger and Lefebvre (2012).
|Year||Name and author|
|1950||Ellesmeroceratida Flower and Kummel, Jr. p. 606|
|1956||Ellesmeroceratida Unklesbay and Young p. 483|
|1964||Ellesmeroceratida Flower p. 28|
|1964||Ellesmerocerida Teichert et al. p. 100|
|2002||Ellesmerocerida Sepkoski, Jr.|
|2005||Ellesmerocerida Evans p. 9|
|2005||Ellesmerocerida Kröger and Mutvei|
|2011||Ellesmerocerida Kröger and Evans|
|2012||Ellesmerocerida Kröger and Lefebvre|
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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.
|B. Kröger and H. Mutvei 2005||Small cyrto-, ortho- and gomphoceracones, usually laterally compressed or rounded in cross-section, mostly with short chambers. Siphuncle marginal or submarginal, mostly ventral, comparatively wide, sometimes with diaphragms. Siphuncular segments concave with largest diameter at septal necks. Connecting ring of a thick spherulitic–prismatic outer layer. Multiple paired muscle scars located at base of living chamber.|