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Helcionella histosia
Taxonomy
Helcionella histosia was named by Jacquet and Brock (2016) [Univalve patelliform shell, lowtomoderate profile with eccentric blunt apex; 60–74° angle of inclination. Maximum shell length greater than 10 mm, apertural outline sub-rectangular and elongate with parallel lateral margins. First order ornament consists of a maximum of 15 sharp angular or stepped concentric rugae; increasing in height from the apex. Second order radial ribs (45–105 μm wide) intersect the rugae perpendicularly to form distinct cross-hatched ornament, with between 3 and 6 radial ribs per millimetre in apertural rugae.]. Its type specimen is SAM P50856, a shell, and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Helcionella histosia Jacquet and Brock |
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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.
†Helcionella histosia Jacquet and Brock 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| S. M. Jacquet and G. A. Brock 2016 | Univalve patelliform shell, low to moderate profile with eccentric blunt apex; 60–74° angle of inclination. Maximum shell length greater than 10 mm, apertural outline sub-rectangular and elongate with parallel lateral margins. First order ornament consists of a maximum of 15 sharp angular or stepped concentric rugae; increasing in height from the apex. Second order radial ribs (45–105 μm wide) intersect the rugae perpendicularly to form distinct cross-hatched ornament, with between 3 and 6 radial ribs per millimetre in apertural rugae. |
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class | |||||
| References: Feng et al. 2000, Hendy 2009, Hendy et al. 2009 | |||||