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Lophorhothon atopus

Reptilia

Taxonomy
Lophorhothon atopus was named by Langston (1960). Its type specimen is FMNH P27383, a partial skeleton (much of the skull, partial predentary, 44 vertebrae, ribs, chevrons, partial hands, ischia, legs, and feet, and a femur), and it is a 3D body fossil. Its type locality is Site 9, Moore Brothers' Farm, which is in a Santonian marine marl in the Mooreville Chalk Formation of Alabama. It is the type species of Lophorhothon.

Synonymy list
YearName and author
1960Lophorhothon atopus Langston p. 321 figs. 146-158
1964Lophorhothon atopus Kuhn p. 22
1964Lophorhothon atopus Tatarinov p. 561
1979Lophorhothon atopus Baird and Horner p. 17
1981Lophorhothon atopus Thurmond and Jones p. 145–146
1983Lophorhothon atopus Weishampel and Weishampel p. 44
1990Lophorhothon atopus Weishampel and Horner p. 557
2004Lophorhothon atopus Godefroit et al. p. 147
2004Lophorhothon atopus Horner et al. p. 440
2004Lophorhothon atopus Kiernan and Schwimmer p. 91
2006Lophorhothon atopus Lund and Gates p. 273
2008Lophorhothon atopus Godefroit et al. p. 66
2010Lophorhothon atopus McDonald et al. p. 33 fig. 39
2010Lophorhothon atopus Prieto-Marquez and Salinas p. 829
2010Lophorhothon atopus Prieto-Márquez p. 1
2010Lophorhothon atopus Prieto-Márquez and Norell p. 9
2010Lophorhothon atopus Prieto-Márquez and Wagner p. 1243 fig. 3
2011Lophorhothon atopus Ebersole and King p. 82
2011Lophorhothon atopus Gates et al. p. 801
2011Lophorhothon atopus Prieto-Márquez p. 63
2012Lophorhothon atopus Godefroit et al. p. 16
2012Lophorhothon atopus Prieto-Márquez p. 524
2012Lophorhothon atopus Ramírez-Velasco et al. p. 380
2013Lophorhothon atopus Ikejiri et al. p. 47
2013Lophorhothon atopus Zheng et al.
2014Lophorhothon atopus Tsogtbaatar et al. p. 126
2015Lophorhothon atopus Ohashi et al. p. 4
2016Lophorhothon atopus Prieto-Márquez et al. p. 1
2017Lophorhothon atopus Cruzado-Caballero and Powell p. 12 fig. 13
2018Lophorhothon atopus Gates et al. p. 13
2021Lophorhothon atopus Gates and Lamb p. 919
2021Lophorhothon atopus Kobayashi et al. p. 1

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
—Diapsida()
RankNameAuthor
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Cerapoda
—Ornithopoda()
—Clypeodonta
—Iguanodontia()
—Dryomorpha
—Ankylopollexia
—Neoiguanodontia
—Hadrosauromorpha
genusLophorhothon
speciesatopus

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.

†Lophorhothon atopus Langston 1960
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Diagnosis
ReferenceDiagnosis
W. Langston 1960Same as for genus.
A. Prieto-Márquez et al. 2016an elevated skull with short snout, wide orbits and wide temporal fenestrae, nasal pyramidal crest similar to that of Prosaurolophus but located well rostral to the orbits, large fronto-nasal fontanelle, teeth with heavily crenulated enamel surfaces and denticulate coronal margins.
T. A. Gates and J. P. Lamb 2021Ornithopod dinosaur with the following autapomorphies: nasal with rostromedial facing shallow concavities separated by a median ridge and elevated above the main nasal body, an elongated, ovular posterior process that tapers dorsoventrally distally (when combined with its opposite nasal, the posterior processes diverge instead of coalescing); prefrontal with elongated lacrimal buttress well offset from thin rostromedial prefrontal body, and incised narrow lacrimal fossa (for accepting a complementary process from the lacrimal); squamosal with a rostral process that possesses a ventrally directed fold of bone that overlaps the corresponding postorbital caudal process.
Additionally, Lophorhothon possesses the following unique combination of characters: premaxilla with a “double-layer” morphology at oral rim and conical denticles along the oral margin; frontonasal fenestra; jugal with a rostroventrally oriented vermiform extension of rostral process; prefrontal orbital margin with a sharp lateral edge.
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
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: gregariouso
Environment: terrestrialo
Locomotion: actively mobileo
Life habit: ground dwellingo
Diet: herbivoresubo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2005-08-25 05:54:38
Modified: 2005-08-25 07:54:38
Source: g = genus, subo = suborder, o = order
References: Peczkis 1995, Marsh 1875, Benton 1983

Age range: base of the Late/Upper Santonian to the top of the Early/Lower Campanian or 85.70000 to 72.20000 Ma

Collections (2 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Santonian85.7 - 83.6USA (Alabama) Hadrosauridae indet. (type locality: 52053)
Early/Lower Campanian83.6 - 72.2USA (Alabama) Lophorhothon atopus (81930)