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Paradoxides (Hydrocephalus)
Taxonomy
Hydrocephalus was named by Barrande (1846) [Sepkoski's age data: ]. It is not extant.
It was reranked as Paradoxides (Hydrocephalus) by Fletcher et al. (2005).
It was assigned to Paradoxididae by Whittington et al. (1997); to Redlichiida by Sepkoski (2002); and to Paradoxides by Fletcher et al. (2005).
It was reranked as Paradoxides (Hydrocephalus) by Fletcher et al. (2005).
It was assigned to Paradoxididae by Whittington et al. (1997); to Redlichiida by Sepkoski (2002); and to Paradoxides by Fletcher et al. (2005).
Species lacking formal opinion data
Hydrocephalus donayrei, Hydrocephalus lyelli, Hydrocephalus mandiki, Hydrocephalus minor, Hydrocephalus rotundatus, Paradoxides brachyrhachis, Paradoxides davidis, Paradoxides enormis, Paradoxides insularis, Paradoxides polonicus, Paradoxides pradoanus, Paradoxides remus, Paradoxides rugulosus, Paradoxides sacheri, Paradoxides samsonowiczi, Paradoxides slowiecensis, Paradoxides subenormis
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1846 | Hydrocephalus Barrande |
| 1969 | Paradoxides (Eoparadoxides) Solov''yev |
| 1990 | Rejkocephalus Kordule |
| 1997 | Hydrocephalus Whittington et al. p. 476 |
| 2002 | Rejkocephalus Jell and Adrain p. 438 |
| 2002 | Hydrocephalus Sepkoski |
| 2005 | Paradoxides (Hydrocephalus) Fletcher et al. p. 321 |
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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.
Subg. †Paradoxides (Hydrocephalus) Barrande 1846
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†Hydrocephalus carens Barrande 1846
†Hydrocephalus vikensis Rushton and Weidner 2007
†Paradoxides (Hydrocephalus) harlani Green 1834
Invalid names: Paradoxides (Eoparadoxides) Solov''yev 1969 [synonym], Rejkocephalus Kordule 1990 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. P. Fletcher et al. 2005 | Glabella widening markedly to L4, with anterior margin less than semicircular; S0-S2 transglabellar, S3 and S4 short, shallow; anterior cranidial border flat, not well defined by impressed border furrows, widening (sag.) markedly abaxially; in more mature stages, border furrows barely discernible. |