PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Zarhachis

Mammalia - Cetacea - Platanistidae

Taxonomy

Zarhachis was named by Cope (1868). It was considered monophyletic by Muizon (1987), Uhen et al. (2008), Geisler et al. (2011).

It was assigned to Iniidae by Gill (1872); to Eurhinodelphinae by Trouessart (1904); to Acrodelphinae by Zittel (1925); to Platanistinae by Trouessart (1898), Hay (1902), Hay (1930), Simpson (1945); to Platanistidae by Gill (1871), Cope (1890), Rhoads (1903), Case (1904), Kellogg (1928), Whitmore (1984), Muizon (1987), Carroll (1988), Muizon (1994), Gottfried et al. (1994), McKenna and Bell (1997), Hamilton et al. (2001), Fordyce and de Muizon (2001), Bianucci and Landini (2002), Geisler and Sanders (2003), Uhen et al. (2008), Geisler et al. (2011), Boersma and Pyenson (2016), Berta (2017), Aguirre-Fernández et al. (2017), Kimura (2018); and to Pomatodelphininae by Barnes (2006), Bianucci et al. (2013), Marx et al. (2016), Godfrey et al. (2017), Godfrey and Lambert (2023).

Species

Z. crassangulum, Z. flagellator, Z. tysonii, Z. velox

Synonymy list

Year	Name and author
1868	Zarhachis Cope p. 189
1871	Zarhachis Gill p. 125
1872	Zarhachis Gill p. 94
1890	Zarhachis Cope p. 604
1898	Zarhachis Trouessart p. 1024
1902	Zarhachis Hay p. 592
1903	Zarhachis Rhoads p. 248
1904	Zarhachis Case p. 20
1904	Zarhachis Trouessart p. 762
1925	Zarhachis Zittel p. 87
1928	Zarhachis Kellogg p. 34 figs. Table 1
1930	Zarhachis Hay p. 596
1945	Zarhachis Simpson p. 101
1984	Zarhachis Whitmore p. 230
1987	Zarachis Muizon p. 13
1988	Zarhachis Carroll
1994	Zarhachis Gottfried et al. p. 233
1994	Zarhachis Muizon p. 136
1997	Zarhachis McKenna and Bell p. 383
2001	Zarhachis Fordyce and de Muizon p. 178
2001	Zarhachis Hamilton et al. p. 554 figs. Table 1
2002	Zarhachis Bianucci and Landini p. 21
2003	Zarhachis Geisler and Sanders p. 28
2006	Zarhachis Barnes p. 32
2008	Zarhachis Uhen et al. p. 582
2011	Zarhachis Geisler et al. p. 6 figs. Table 1
2013	Zarachis Bianucci et al. p. 744 figs. Figure 3
2016	Zarhachis Boersma and Pyenson p. 12 figs. Figure 10
2016	Zarhachis Marx et al. p. 125
2017	Zarhachis Aguirre-Fernández et al.
2017	Zarhachis Berta p. 163
2017	Zarhachis Godfrey et al.
2018	Zarhachis Kimura p. 4 figs. Fig. 4
2023	Zarhachis Godfrey and Lambert p. 87

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes

Rank	Name	Author
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Artiodactylamorpha
—	Artiodactyla	()
—	Whippomorpha
order	Cetacea
—	Pelagiceti
—	Neoceti
suborder	Odontoceti
—	Amblyoccipita
—	Stegoceti
family	Platanistidae	()
genus	Zarhachis

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. †Zarhachis Cope 1868

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†Zarhachis crassangulum Case 1904

†Zarhachis flagellator Cope 1868

†Zarhachis tysonii Cope 1869

†Zarhachis velox Cope 1869

Diagnosis

Reference	Diagnosis
M. D. Uhen et al. 2008	Lumbar vertebrae have broadly a broadly obtuse medial line, which offers distinct traces of the two keels. Members of the genus Zarhachis have dorsoventrally compressed rostra and symphyseal regions of the mandibles (Cope, 1868b).