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Helcura surgens
Taxonomy
Helcura surgens was named by Hitchcock (1858). It is considered to be a form taxon. Its type specimen is AC 19/8, a footprint, and it is a trace fossil. Its type locality is Lily Pond Quarry, Gill, which is in a Hettangian fluvial-lacustrine siltstone/sandstone in the Turners Falls Formation of Massachusetts.
Synonymy list
Year | Name and author |
---|---|
1858 | Helcura surgens Hitchcock p. 141 |
1871 | Helcura surgens Hitchcock p. xxi |
1889 | Helcura surgens Hitchcock p. 119 |
1894 | Helcura surgens Lyman p. 206 |
1902 | Helcura surgens Hay p. 546 |
1904 | Helcura surgens Lull p. 531 |
1917 | Helcura surgens Lull p. 124 |
1930 | Helcura surgens Hay p. 14 |
1971 | Helcura surgens Haubold p. 101 |
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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.
†Helcura surgens Hitchcock 1858
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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Source: c = class, subp = subphylum, uc = unranked clade | |||||
References: Carroll 1988, Hendy et al. 2009 |
Age range: Hettangian or 201.30000 to 199.30000 Ma
Collections (2 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Hettangian | USA (Massachusetts) | Helcura surgens (type locality: 52986) | |
Hettangian - Sinemurian | USA (Massachusetts) | Helcura surgens (52996) |