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Ancalocrinus
Taxonomy
Ancalocrinus was named by Webster and Lane (1987) [Sepkoski's age data: C Tour-l C Tour-u Sepkoski's reference number: 704]. It is not extant. Its type is Actinocrinus spinobrachiatus.
It was assigned to Actinocrinitinae by Webster and Lane (1987); and to Monobathrida by Sepkoski (2002).
It was assigned to Actinocrinitinae by Webster and Lane (1987); and to Monobathrida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1987 | Ancalocrinus Webster and Lane |
| 2002 | Ancalocrinus Sepkoski |
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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 | |
|---|---|---|
| G. D. Webster and N. G. Lane 1987 | Crown elongate; calyx strongly lobate; theca discoid to wide shallow bowlshaped; tegmen stout, highly arched, summit spinose; generally 4 free biserial arms per ray, no distal branching; stem round, lumen pentalobate. |