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Encrinurus (Nucleurus)
Taxonomy
Encrinurus (Nucleurus) was named by Ramsköld (1986) [Sepkoski's age data: S Ldov-m S Ldov-u Sepkoski's reference number: 1088]. It is not extant. It was considered monophyletic by Edgecombe and Chatterton (1990).
It was reranked as Nucleurus by Edgecombe and Chatterton (1990), Jell and Adrain (2002), Sepkoski (2002).
It was assigned to Encrinurus by Ramsköld (1986); to Phacopida by Sepkoski (2002); and to Encrinuridae by Edgecombe and Chatterton (1990), Jell and Adrain (2002).
It was reranked as Nucleurus by Edgecombe and Chatterton (1990), Jell and Adrain (2002), Sepkoski (2002).
It was assigned to Encrinurus by Ramsköld (1986); to Phacopida by Sepkoski (2002); and to Encrinuridae by Edgecombe and Chatterton (1990), Jell and Adrain (2002).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1986 | Encrinurus (Nucleurus) Ramsköld |
| 1990 | Nucleurus Edgecombe and Chatterton pp. 4-5 |
| 2002 | Nucleurus Jell and Adrain p. 412 |
| 2002 | Nucleurus 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.
Subg. †Encrinurus (Nucleurus) Ramsköld 1986
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. Ramsköld 1986 | Glabella relatively short and wide. Anterior cranidial border with nine to fourteen tubercles, usually 10-12. Tubercles on fixed cheek along rachial furrow equal in size or slightly larger than other fixed cheek tubercles. 1L usually small, ridge-shaped, set well below 2 L, never tuberculate abaxially. Genal angle rounded or with a tiny spine. Labral plate with wide rhynchos not reaching level anteriorly with labral suture, posterior border of small to medium length. No thoracic axial spines. Pygidium shor and wide, non-mucronate. 7^2-10^1 pleural ribs. Posterior pleurae commonly merged to form a "loop". R/P ratio 1·8-2·5. |