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Homalocephale

Reptilia

Taxonomy

Homalocephale was named by Maryańska and Osmólska (1974). It is the type genus of Homalocephalidae, Homalocephaleridae.

It was assigned to Homalocephaleridae by Dong (1978); to Homalocephalidae by Perle et al. (1982), Sues and Galton (1987), Carroll (1988), Maryanska (1990), Olshevsky and Ford (1994), Sues (1997); to Homalocephaloidea by Sereno (1986), Maryanska et al. (2004); to Pachycephalosauria by Kielan-Jaworowska (1984), Maryanska and Osmólska (1985), Sereno (1997), Sereno (1998), Sereno (1999), Williamson and Carr (2003), Williamson and Carr (2006), Butler et al. (2007); to Pachycephalosauridae by Maryańska and Osmólska (1974), Rozhdestvensky (1977), Bonaparte (1978), Wall and Galton (1979), Sues and Galton (1982), Barsbold (1997), Sullivan (2006), Schott et al. (2009); to Pachycephalosauria by Sereno (2000), Butler et al. (2008), Han et al. (2012); to Eupachycephalosauria by Dieudonné et al. (2020); and to Pachycephalosaurinae by Woodruff et al. (2021).

Species

H. calathocercos

Synonymy list

Year	Name and author
1974	Homalocephale Maryańska and Osmólska p. 56
1977	Homalocephale Rozhdestvensky p. 114
1978	Homalocephale Bonaparte p. 466
1978	Homalocephale Dong p. 228
1979	Homalocephale Wall and Galton p. 1182
1982	Homalocephale Perle et al. p. 116
1982	Homalocephale Sues and Galton p. 188
1984	Homalocephale Kielan-Jaworowska p. 103
1985	Homalocephale Maryanska and Osmólska p. 141
1986	Homalocephale Sereno
1987	Homalocephale Sues and Galton p. 34 fig. 20
1988	Homalocephale Carroll
1990	Homalocephale Maryanska p. 566
1994	Homalocephale Olshevsky and Ford p. 91
1997	Homalocephale Barsbold p. 449
1997	Homalocephale Sereno p. 440 fig. 2
1997	Homalocephale Sues p. 512
1998	Homalocephale Sereno p. 68
1999	Homalocephale Sereno p. 2138 fig. 2
2000	Homalocephale Sereno p. 482
2003	Homalocephale Williamson and Carr fig. 11
2004	Homalocephale Maryanska et al. p. 465
2006	Homalocephale Sullivan p. 353
2006	Homalocephale Williamson and Carr pp. 325-326 fig. 2
2007	Homalocephale Butler et al. p. S18 fig. S2
2008	Homalocephale Butler et al. pp. 22-23 figs. 2-4
2009	Homalocephale Schott et al. p. 783 fig. 8
2012	Homalocephale Han et al. p. 1391 fig. 14
2020	Homalocephale Dieudonné et al.
2021	Homalocephale Woodruff et al. p. 588 fig. 14

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Eugnathostomata
—	Teleostomi	(Bonaparte 1836)
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia

Rank	Name	Author
subclass	Eureptilia	()
—	Romeriida
—	Diapsida	()
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
informal	Avemetatarsalia
—	Ornithodira
—	Dinosauromorpha
—	Dinosauriformes
—	Dinosauria	()
—	Ornithischia	()
—	Genasauria
—	Cerapoda
—	Marginocephalia
—	Pachycephalosauria	()
—	Eupachycephalosauria
genus	Homalocephale

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. †Homalocephale Maryańska and Osmólska 1974

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†Homalocephale calathocercos Maryańska and Osmólska 1974

Diagnosis

Reference	Diagnosis
T. Maryańska and H. Osmólska 1974	Genus monotypic; diagnosis, geographic and stratigraphic distribution - as for the species.

Measurements

No measurements are available

Composition:

hydroxyapatiteo

Entire body:

yesg

Adult length:

10 to < 100o

Adult width:

1.0 to < 10o

Adult height:

1.0 to < 10o

Maximum body mass:

30 kgg

Minimum body mass:

10 kgg

Architecture:

compact or denseo

Ontogeny:

accretion, modification of partso

Grouping:

gregariouso

Environment:

terrestrialo

Locomotion:

actively mobileo

Life habit:

ground dwellingo

Diet:

herbivoreo

Reproduction:

oviparouso

Dispersal:

direct/internalo

Dispersal 2:

mobileo

Created:

2005-08-25 05:51:37

Modified:

2005-08-25 07:51:37

Source: g = genus, o = order

References: Marsh 1875, Peczkis 1995

Age range: Maastrichtian or 72.20000 to 66.00000 Ma

Collections (2 total)

Time interval	Ma	Country or state	Original ID and collection number
Maastrichtian	72.2 - 66.0	Mongolia (Omnogov)	H. calathocercos (37019) Ornithischia indet. (180473)