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Euconactaeon
Taxonomy
Euconactaeon was named by Meek (1863) [Sepkoski's age data: J Sine J Plie]. It is not extant.
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).
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).
Synonymy list
| Year | Name and author |
|---|---|
| 1863 | Euconactaeon Meek |
| 1953 | Cylindrobullina (Euconactaeon) Haas p. 276 |
| 2002 | Euconactaeon Sepkoski |
| 2012 | Euconactaeon Gründel and Nützel p. 39 |
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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.
G. †Euconactaeon Meek 1863
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†Cylindrobullina (Euconactaeon) ninacacana Haas 1953
†Cylindrobullina (Euconactaeon) tambosolensis Haas 1953
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| 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. |