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Helcionopsis
Taxonomy
Helcionopsis was named by Ulrich and Scofield (1897) [Sepkoski's age data: Cm lMid O Ashg-m Sepkoski's reference number: 110,615]. It is not extant. Its type is Helcionopsis striata.
It was assigned to Tryblidiidae by Starobogatov (1970) and Runnegar and Jell (1976); to Tryblidiinae by Knight and Yochelson (1960) and Wahlman (1992); and to Tryblidiida by Sepkoski (2002).
It was assigned to Tryblidiidae by Starobogatov (1970) and Runnegar and Jell (1976); to Tryblidiinae by Knight and Yochelson (1960) and Wahlman (1992); and to Tryblidiida by Sepkoski (2002).
Species
H. depressum, H. radiatum, H. reticulatus, H. striata (type species), H. subcarinata, H. wisconsinensis
Synonymy list
| Year | Name and author |
|---|---|
| 1897 | Helcionopsis Ulrich and Scofield |
| 1960 | Helcionopsis Knight and Yochelson p. 79 |
| 1970 | Helcionopsis Starobogatov p. 301 |
| 1976 | Helcionopsis Runnegar and Jell p. 119 |
| 1992 | Helcionopsis Wahlman |
| 2002 | Helcionopsis Sepkoski |
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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. †Helcionopsis Ulrich and Scofield 1897
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†Helcionopsis depressum Ulrich and Scofield 1897
†Helcionopsis radiatum Lindström 1884
†Helcionopsis reticulatus Easton 1943
†Helcionopsis striata Ulrich and Scofield 1897
†Helcionopsis subcarinata Ulrich and Scofield 1897
†Helcionopsis wisconsinensis Ulrich and Scofield 1897
Diagnosis
No diagnoses are available