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Pachyacanthus
Taxonomy
Pachyacanthus was named by Brandt (1871). It is not extant. It was considered monophyletic by Kazár (2010).
It was synonymized subjectively with Champsodelphis by Zittel (1894); it was synonymized subjectively with Priscodelphinus by Trouessart (1898).
It was assigned to Cetotheriinae by Brandt (1873); to Cetotherinae by Brandt (1874), Brandt (1874); to Sirenia by Van Beneden (1875), Woodward (1885); to Halicoridae by Trouessart (1904); to Cetotheriidae by Kellogg (1928); to Balaenopteridae by Abel (1919), Pia and Sickenberg (1934); to Prototheriidae by Kretzoi (1941); to Platanistinae by Simpson (1945); to Odontoceti by McKenna and Bell (1997); to Delphinida by Fordyce and de Muizon (2001); and to Platanistidae by Pia (1937), Carroll (1988), Kazár (2010), Gol'din et al. (2020).
It was synonymized subjectively with Champsodelphis by Zittel (1894); it was synonymized subjectively with Priscodelphinus by Trouessart (1898).
It was assigned to Cetotheriinae by Brandt (1873); to Cetotherinae by Brandt (1874), Brandt (1874); to Sirenia by Van Beneden (1875), Woodward (1885); to Halicoridae by Trouessart (1904); to Cetotheriidae by Kellogg (1928); to Balaenopteridae by Abel (1919), Pia and Sickenberg (1934); to Prototheriidae by Kretzoi (1941); to Platanistinae by Simpson (1945); to Odontoceti by McKenna and Bell (1997); to Delphinida by Fordyce and de Muizon (2001); and to Platanistidae by Pia (1937), Carroll (1988), Kazár (2010), Gol'din et al. (2020).
Synonymy list
| Year | Name and author |
|---|---|
| 1871 | Pachyacanthus Brandt p. 564 |
| 1873 | Pachyacanthus Brandt p. 166 |
| 1874 | Pachyacanthus Brandt p. II |
| 1875 | Pachyacanthus Van Beneden p. 340 |
| 1885 | Pachyacanthus Woodward p. 424 |
| 1904 | Pachyacanthus Trouessart p. 750 |
| 1919 | Pachyacanthus Abel p. 753 |
| 1928 | Pachyacanthus Kellogg p. 35 figs. Table 1 |
| 1934 | Pachyacanthus Pia and Sickenberg p. 26 |
| 1937 | Pachyacanthus Pia p. 60 |
| 1941 | Pachyacanthus Kretzoi p. 155 |
| 1945 | Pachyacanthus Simpson p. 101 |
| 1988 | Pachyacanthus Carroll |
| 1997 | Pachyacanthus McKenna and Bell p. 379 |
| 2001 | Pachyacanthus Fordyce and de Muizon p. 178 |
| 2010 | Pachyacanthus Kazár p. 542 |
| 2020 | Pachyacanthus Gol'din et al. p. 12 |
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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. †Pachyacanthus Brandt 1871
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†Pachyacanthus suessii Brandt 1871
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Invalid names: Cetotherium ambiguum Brandt 1872 [synonym], Pachyacanthus andrussovi Dombrovsky 1925 [synonym], Pachyacanthus bajarunasi Dombrovsky 1925 [synonym], Pachyacanthus letochae Brandt 1873 [synonym], Pachyacanthus trachyspondylus Brandt 1871 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. Kazár 2010 | Platanistoid with pachyostosis in the spinous processes of the postcervical vertebrae. |