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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Helena
Taxonomy
Helena was named by Hull (1997). It is the type genus of Heleninae.
It was assigned to Leugeonidae by Hull (1997); and to Heleninae by De Wever et al. (2001).
It was assigned to Leugeonidae by Hull (1997); and to Heleninae by De Wever et al. (2001).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Helena Hull |
| 2001 | Helena De Wever et al. p. 114 |
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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. †Helena Hull 1997
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: p = phylum | |||||
| Reference: Kiessling 1999 | |||||
Age range: base of the Callovian to the top of the Early/Lower Berriasian or 165.30000 to 141.00000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Callovian | USA (California) | H. exquisita (50737) | |
| Late/Upper Tithonian - Early/Lower Berriasian | Russian Federation | H. sp. (51289) |