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Annuloceras
Taxonomy
Annuloceras was named by Murphy et al. (1995) [Sepkoski's age data: K Barr-u]. Its type is Annuloceras summersi.
It was assigned to Heteroceratidae by Murphy et al. (1995); to Ammonoidea by Sepkoski (2002); and to Aegocrioceratidae by Klein et al. (2007).
It was assigned to Heteroceratidae by Murphy et al. (1995); to Ammonoidea by Sepkoski (2002); and to Aegocrioceratidae by Klein et al. (2007).
Species
A. summersi (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1995 | Annuloceras Murphy et al. p. 1179 |
| 2002 | Annuloceras Sepkoski |
| 2007 | Annuloceras Klein et al. p. 29 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. A. Murphy et al. 1995 | A heteroceratid ammonite with slowly expanding, planispiral phragmacone and body chamber orient ed at right angles to a loosely coiled helix and with annular, sharp-crested ribs. |