|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Gastropoda - Architectibranchia - Cylindrobullinidae
It was reranked as Cylindrobullina (Euconactaeon) by Haas (1953).
It was assigned to Cylindrobullina by Haas (1953); to Cephalaspida by Sepkoski (2002); and to Cylindrobullinidae by Gründel and Nützel (2012).
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. Gründel and A. Nützel 2012||Euconactaeon has a heterostrophic protoconch. Its spire is not elevated but plane or concave. The transition from the flanks to the spire is sharply or rounded angular. The shell tapers abapically so it is reversed conical. The aperture is narrow and elongated, somewhat widened and rounded abapically. The shell is smooth or has spiral striae. It lacks columellar folds.|