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Jaycea
Taxonomy
Jaycea was named by Landing (1995) [Sepkoski's age data: Cm Atda-u Sepkoski's reference number: 1127].
It was assigned to Sunnaginiidae by Landing (1995); and to Tommotiida by Sepkoski (2002).
It was assigned to Sunnaginiidae by Landing (1995); and to Tommotiida by Sepkoski (2002).
Species lacking formal opinion data
Entered
by J. Sepkoski on 2003-01-23; modified by P. Wagner on 2023-12-24
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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. †Jaycea Landing 1995
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. Landing 1995 | Tommotiids with bimembrate sclerotome consisting of 1) broad, low, symmetrical to asymmetrical (i.e., rightand left-handed), deltaform and quadrate sclerites with straight to convex S1, which may form a duplicature, and marginal to subcentral apex, and 2) high, compressed, cap-shaped sclerites; microsculpture dominated by coarse, transverse growth ridges. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Hendy et al. 2009, Kiessling 2004, Aberhan et al. 2004 | |||||
Age range: Atdabanian or 521.00000 to 516.00000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Atdabanian | Canada (Nova Scotia) | J. deltaformis (232701) J. deltraformis (9386) |