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Leptostega
Taxonomy
Leptostega was named by Geyer (1986) [Sepkoski's age data: Cm Atda-u Cm mMid-l Sepkoski's reference number: 699,1006].
It was assigned to Cyrtonellida by Bengtson (1992); to Helcionelloida by Sepkoski (2002); to Trenellidae by Parkhaev (2005); and to Helcionellidae by Kouchinsky et al. (2011).
It was assigned to Cyrtonellida by Bengtson (1992); to Helcionelloida by Sepkoski (2002); to Trenellidae by Parkhaev (2005); and to Helcionellidae by Kouchinsky et al. (2011).
Synonymy list
| Year | Name and author |
|---|---|
| 1986 | Leptostega Geyer |
| 1992 | Leptostega Bengtson p. 1027 |
| 2002 | Leptostega Sepkoski |
| 2005 | Leptostega Parkhaev |
| 2011 | Leptostega Kouchinsky et al. p. 133 |
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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. †Leptostega Geyer 1986
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†Leptostega abrupta Shaler and Foerste 1888
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Invalid names: Leptostega cingulata Cobbold 1921 [synonym]
†Leptostega frankenwaldensis Geyer et al. 2018
†Leptostega hyperborea Parkhaev 2005
†Leptostega irregularis Geyer 1986
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Kouchinsky et al. 2011 | "Internal moulds triangular in lateral view with apex sub-central or slightly inclined, moderately compressed laterally, surface with strong concentric ribs that may alternate on the narrow sides, aperture elliptical (modified from Geyer 1986, p. 84, Bengtson et al. 1990, p. 234 and Parkhaev, 2005, p. 618)." |