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Homalocephale calathocercos

Reptilia -

Taxonomy
Homalocephale calathocercos was named by Maryanska and Osmolska (1974). Its type specimen is MPC-D/GI SPS 100/1201 (= MPC-D/GI SPS 100/51), a partial skeleton, and it is a 3D body fossil. Its type locality is Nemegt, Western Sayr, site 8 [PMPE], which is in a Campanian/Maastrichtian terrestrial conglomerate/sandstone in the Nemegt Formation of Mongolia. It is the type species of Homalocephale.

Synonymy list
YearName and author
1974Homalocephale calathocercos Maryanska and Osmolska p. 56 figs. 1D, 4-5; Pl. 22:1, 24, 26-30, 31:1
1977Homalocephale calathocercos Rozhdestvensky p. 114
1979Homalocephale calathocercos Wall and Galton p. 1182
1982Homalocephale calathocercos Perle et al. pp. 116-117
1986Homalocephale calathocercos Zhao p. 72
1990Homalocephale calathocercos Maryanska p. 566
1997Homalocephale calathocercos Barsbold p. 449
1997Homalocephale calathocercos Osmólska p. 472
1997Homalocephale calathocercos Sues p. 512
2000Homalocephale calathocercos Sereno p. 482
2003Homalocephale calathocercos Williamson and Carr fig. 11
2004Homalocephale calathocercos Maryanska et al. p. 465
2006Homalocephale calathocercos Sullivan p. 353
2008Homalocephale calathocercos Butler et al. p. 9
2009Homalocephale calathocercos Butler and Sullivan p. 26
2009Homalocephale calathocercos Butler and Zhao p. 66
2009Homalocephale calathocercos Schott et al. p. 783 fig. 8
2009Homalocephale calathocercos Williamson et al. p. 292
2010Homalocephale calathocercos Longrich et al. p. 280
2012Homalocephale calathocercos Han et al. p. 1391 fig. 14

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
OlfactoresJefferies 1991
subphylumVertebrata
Gnathostomata()
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
RankNameAuthor
Diapsida()
Eosuchia()
Neodiapsida
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Ornithischia()
Neornithischia()
Clypeodonta
Cerapoda
Marginocephalia
Pachycephalosauria()
genusHomalocephale
speciescalathocercos

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.

Diagnosis
ReferenceDiagnosis
T. Maryanska and H. Osmolska 1974Cranial roof thick but completely fiat. Supratemporal fenestra large. In- terfrontal and frontoparietal sutures distinct. Infratemporal fenestra low and long. Orbit large and nearly round. Quad rate deflected back ward s along the upper half of its length. Occipital region moderately concave, deepened centrally. Foramen magnum round and large. Occipital condyle large. Basaltubera flat anteroposteriorly, their ventral edges very close to quadratic wings of pterygoids. Ventral maxillary edge arched outwards posteriorly. Maxillary teeth with small crowns. Cranial roof roughly ornamented.
A. Perle et al. 1982Supratemporal fenestra rounded, interfenestral brigde broad, equal about the transverse width of supratemporal fenestra. Interfrontal and frontoparietal sutures distinct. Infratemporal fenestra broad anteroposteriorly and high dorsoventrally. Orbit large and nearly round. Dorsal part of quadrate deflected posteriorly. Occiput moderately concave, deepened at the centre. Foramen magnum relatively large, about one seventh of width of the occiput. Occipital condyle large. Ventral maxillary edge bowed laterally along its posterior portion. Cranial roo froughly ornamented. Sacrum incuding 6 coalesced vertebrae. Preacetabular process of ilium with gently convex dorsal surface; medial iliac flange long anteroposteriorly: postacetabular process curved downwards in lateral view.
R. J. Butler et al. 2008A postacetabular process of the ilium that is crescent-shaped and ventrally deflected.