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Sunnaginiidae
Taxonomy
Sunnaginiidae was named by Landing (1984). It is not extant. Its type is Sunnaginia.
It was assigned to Tommotiida by Landing (1984) and Li and Xiao (2004).
It was assigned to Tommotiida by Landing (1984) and Li and Xiao (2004).
Subtaxa
Jaycea, Sunnaginia (type genus)
Synonymy list
Year | Name and author |
---|---|
1984 | Sunnaginiidae Landing p. 1392 |
2004 | Sunnaginiidae Li and Xiao p. 902 |
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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 | |
---|---|---|
E. Landing 1984 | Tommotiids with a multiunit, unimembrate skeleton consisting of low, conical, morphologically variable, helical, rightand left-handed plates with sulcus; type genus with imperforate transverse partitions continuous with outer growth ridges and joined internally by prismatic layer with hollow, vertical, pillar-like structures. |