| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Helmetiidae
Taxonomy
Helmetiidae was named by Simonetta and Delle Cave (1975).
It was assigned to Helmetiida by O'Flynn et al. (2024), Losso et al. (2025).
It was assigned to Helmetiida by O'Flynn et al. (2024), Losso et al. (2025).
Subtaxa
Synonymy list
| Year | Name and author |
|---|---|
| 1975 | Helmetiidae Simonetta and Delle Cave |
| 2024 | Helmetiidae O'Flynn et al. p. 810 |
| 2025 | Helmetiidae 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
| Reference | Diagnosis | |
|---|---|---|
| S. R. Losso et al. 2025 | Concilitergans in which the thorax has tergites with non-effaced boundaries and well-developed pleural spines, and a pygidium with variable number of posterolateral spines and a medial terminal spine
with a broad base. |
Measurements
No measurements are available
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| Source: p = phylum | |||||
| Reference: Kiessling 2004 | |||||
Age range: Atdabanian or 521.00000 to 516.00000 Ma
Collections (16 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Atdabanian | China (Yunnan) | Kuamaia lata (68083 90149 90163 96405 96406 96407 96412) Kuamaia lata, Kuamaia muricata, Rhombicalvaria acantha (96402) Kuamaia lata, Rhombicalvaria acantha (90494) Kuamaia sp. (86929) | |
| Nangaoian | China (Yunnan) | Kuamaia lata (132329 132330 194141 194153 194155 194161) |