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Hypagnostus
Taxonomy
Hypagnostus was named by Jaeckel (1909) [Sepkoski's age data: ]. It is not extant. It is the type genus of Hypagnostidae.
It was assigned to Spinagnostidae by Whittington et al. (1997); to Agnostida by Sepkoski (2002); to Peronopsidae by Jell and Adrain (2002); to Hypagnostidae by Paterson and Laurie (2004); and to Spinagnostinae by Jago and Cooper (2007).
It was assigned to Spinagnostidae by Whittington et al. (1997); to Agnostida by Sepkoski (2002); to Peronopsidae by Jell and Adrain (2002); to Hypagnostidae by Paterson and Laurie (2004); and to Spinagnostinae by Jago and Cooper (2007).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1909 | Hypagnostus Jaeckel |
| 1935 | Spinagnostus Howell |
| 1937 | Cyclopagnostus Howell |
| 1982 | Breviagnostus Liu |
| 1997 | Hypagnostus Whittington et al. p. 356 |
| 2002 | Hypagnostus Jell and Adrain p. 364 |
| 2002 | Hypagnostus Sepkoski |
| 2004 | Hypagnostus Paterson and Laurie p. 95 |
| 2007 | Hypagnostus Jago and Cooper p. 475 |
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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. †Hypagnostus Jaeckel 1909
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†Hypagnostus anhuiensis Lu and Zhu 1980
†Hypagnostus bilobatus Qian and Zhou 1984
†Hypagnostus brevifrons Angelin 1851
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Invalid names: Acadagnostus transversus Yang et al. 1993 [synonym], Hypagnostus brachydolonus Zhou and Yang 1977 [synonym], Hypagnostus kendectasicus Kryskov 1960 [synonym], Hypagnostus parabrevifrons Yang et al. 1993 [synonym]
†Hypagnostus gibber Yang et al. 1993
†Hypagnostus hunanicus Lu 1957
†Hypagnostus parvifrons Linnarsson 1869
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Invalid names: Hypagnostus correctus Opik 1967 [synonym], Hypagnostus dabashanensis Yang et al. 1993 [synonym]
†Hypagnostus prodigialis Ergaliev and Ergaliev 2008
†Hypagnostus scrobiculatus Westergard 1946
†Hypagnostus transversus Yang et al. 1993
†Hypagnostus truncatus Brogger 1878
†Hypagnostus vulgarus Qian and Qiu 1983
Invalid names: Breviagnostus Liu 1982 [synonym], Cyclopagnostus Howell 1937 [synonym], Spinagnostus Howell 1935 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Jago and R. A. Cooper 2007 | See Shergold & Laurie (1997, p. 5), with the amendment that the F3 glabellar furrow may be effaced, as may be the posterior parts of the axial furrows of the pygidium. |