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Helmetia
Taxonomy
Helmetia was named by Walcott (1918) [Sepkoski's age data: Cm mMid-u]. It is not extant.
It was assigned to Arthropoda by Briggs et al. (1994); to Merostomoidea by Sepkoski (2002); to Conciliterga by Paterson et al. (2012), Lerosey-Aubril et al. (2017); and to Helmetiidae by Losso et al. (2025).
It was assigned to Arthropoda by Briggs et al. (1994); to Merostomoidea by Sepkoski (2002); to Conciliterga by Paterson et al. (2012), Lerosey-Aubril et al. (2017); and to Helmetiidae by Losso et al. (2025).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1918 | Helmetia Walcott |
| 1994 | Helmetia Briggs et al. p. 220 |
| 2002 | Helmetia Sepkoski |
| 2012 | Helmetia Paterson et al. |
| 2017 | Helmetia Lerosey-Aubril et al. p. 8 fig. 6 |
| 2025 | Helmetia Losso et al. p. 5 |
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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
No diagnoses are available