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Hypsilophodontidae (hypsilophodontid)

Reptilia

Taxonomy
Hypsilophodontidae was named by Dollo (1882). Its type is Hypsilophodon.

It was reranked as the subfamily Hypsilophodontidae by Nopcsa (1901); it was misspelled as Hypsilophontidae by von Zittel (1911), Lull (1924), Huene (1927), Hay (1930), Russell (1930), Parks (1935), Swinton (1936), Roxo (1937), Kuhn (1946), Lapparent (1947), Huene (1948), Haughton and Brink (1954), Romer (1956), Parsch (1963), Tatarinov (1964), Kuhn (1964), Estes (1964), Simmons (1965), Kuhn (1966), Romer (1966), Charig (1967), Thulborn (1970), Swinton (1970), Thulborn (1970), Galton (1972), Thulborn (1972), Thulborn (1974), Galton (1974), Galton (1974), Thulborn (1975), Thulborn (1977), Galton (1977), Bonaparte (1978), Madsen and Miller (1979), Benton (1979), Bonaparte (1980), Ostrom (1980), McIntosh (1981), Colbert (1981), Weishampel and Weishampel (1983), Galton (1983), Buscalioni and Sanz (1984), Milner and Norman (1984), Norman (1984), Norman (1984), Russell (1984), Cooper (1985), Sereno (1986), Bakker (1986), Buscalioni and Sanz (1987), Carroll (1988), Dong (1989), Benton (1990), Sues and Norman (1990), Molnar (1992), Weishampel and Heinrich (1992), Coria and Salgado (1996), Sereno (1997), Sereno (1998), Sereno (1999), Eberth et al. (2001), Chure et al. (2006), Sánchez-Hernández et al. (2007), Alifanov and Saveliev (2014); it was reranked as the unranked clade Hypsilophodontidae by Buchholz (2002), Dieudonné et al. (2020).

It was assigned to Iguanodontia by Baur (1891); to Kalodontidae by Nopcsa (1901); to Ornithopodidae by von Zittel (1911); to Ornithopoda by Huene (1927); to Iguanodontoidae by Hay (1930); to Ornithischia by Parks (1935); to Kalodontoidea by Huene (1948); to Dolichopoda by Thulborn (1974), Thulborn (1975), Thulborn (1977); to Ornitophoda by Bonaparte (1978); to Ornithischia by Madsen and Miller (1979); to Hypsilophodontoidea by Cooper (1985); to Ornithopoda by Dollo (1882), Bakker (1986); to Hypsilophodontia by Russell (1984), Sereno (1986); to Ornithischia by Eberth et al. (2001); to Euornithopoda by Benton (1990), Weishampel and Heinrich (1992), Coria and Salgado (1996), Sereno (1997), Sereno (1998), Sereno (1999), Buchholz (2002); to Ornithopoda by Dollo (1884), Marsh (1895), Marsh (1896), Lull (1924), Russell (1930), Swinton (1936), Roxo (1937), Kuhn (1946), Lapparent (1947), Haughton and Brink (1954), Romer (1956), Parsch (1963), Tatarinov (1964), Kuhn (1964), Estes (1964), Simmons (1965), Kuhn (1966), Romer (1966), Charig (1967), Thulborn (1970), Swinton (1970), Thulborn (1970), Galton (1972), Thulborn (1972), Galton (1974), Galton (1974), Galton (1977), Benton (1979), Bonaparte (1980), Ostrom (1980), McIntosh (1981), Colbert (1981), Weishampel and Weishampel (1983), Galton (1983), Buscalioni and Sanz (1984), Milner and Norman (1984), Norman (1984), Norman (1984), Buscalioni and Sanz (1987), Carroll (1988), Dong (1989), Sues and Norman (1990), Chure et al. (2006); to Ornithopoda by Molnar (1992), Sánchez-Hernández et al. (2007); to Hypsilophodontia by Alifanov and Saveliev (2014); and to Clypeodonta by Dieudonné et al. (2020).

Synonyms
Synonymy list
YearName and author
1882Hypsilophodontidae Dollo
1884Hypsilophodontidae Dollo p. 298
1884Macelognathidae Marsh p. 341
1891Hypsilophodontidae Baur p. 450
1895Hypsilophodontidae Marsh
1895Laosauridae Marsh
1896Laosauridae Marsh p. 243
1896Hypsilophodontidae Marsh p. 244
1901Hypsilophodontidae Nopcsa p. 208
1901Kalodontidae Nopcsa p. 208
1902Macelognathidae Hay p. 505
1902Kalodontidae Nopcsa pp. 149-150
1911Hypsilophontidae von Zittel p. 289
1914Laosauridae Huene p. 41
1923Kalodontidae Nopcsa p. 126
1923Laosauridae Osborn
1924Hypsilophodontidae Lull p. 238
1927Kalodontidae Huene p. 267
1927Hypsilophodontidae Huene p. 271
1928Kalodontidae Nopcsa p. 184
1929Kalodontidae Nopcsa p. 70
1930Macelognathidae Hay p. 187
1930Laosauridae Hay p. 205
1930Hypsilophodontidae Hay p. 207
1930Hypsilophodontidae Russell p. 140
1934Kalodontidae Huene p. 15
1935Hypsilophodontidae Parks p. 194
1936Hypsilophodontidae Swinton p. 212
1937Hypsilophodontidae Roxo p. 65
1946Hypsilophodontidae Kuhn p. 66
1947Hypsilophodontidae Lapparent p. 18
1948Hypsilophodontidae Huene p. 94
1954Hypsilophodontidae Haughton and Brink p. 4
1956Hypsilophodontidae Romer p. 628
1963Hypsilophodontidae Parsch p. 4
1964Hypsilophodontidae Estes p. 144
1964Hypsilophodontidae Kuhn p. 5
1964Hypsilophodontidae Tatarinov p. 553
1964Laosauridae Tatarinov p. 555
1965Hypsilophodontidae Simmons p. 65
1966Hypsilophodontidae Kuhn p. 101
1966Hypsilophodontidae Romer p. 370
1967Hypsilophodontidae Charig p. 716
1970Hypsilophodontidae Swinton p. 196
1970Hypsilophodontidae Thulborn p. 244
1972Hypsilophodontidae Galton p. 465
1972Kalodontidae Mones p. 28
1972Hypsilophodontidae Thulborn p. 50
1974Hypsilophodontidae Galton p. 18
1974Hypsilophodontidae Thulborn p. 171
1975Hypsilophodontidae Thulborn p. 134
1977Hypsilophodontidae Galton p. 230
1977Hypsilophodontidae Thulborn p. 737
1978Hypsilophodontidae Bonaparte p. 331
1979Hypsilophodontidae Benton p. 143
1979Hypsilophodontidae Madsen and Miller p. 5
1980Hypsilophodontidae Bonaparte p. 82
1980Hypsilophodontidae Ostrom p. 22
1981Hypsilophodontidae Colbert p. 50
1981Hypsilophodontidae McIntosh p. 30
1983Hypsilophodontidae Galton p. 232
1983Hypsilophodontidae Weishampel and Weishampel p. 44
1984Hypsilophodontidae Buscalioni and Sanz pp. 13-14
1984Hypsilophodontidae Milner and Norman p. 146
1984Hypsilophodontidae Norman pp. 160-161 fig. 2
1984Hypsilophodontidae Russell p. 29
1985Hypsilophodontidae Cooper p. 286
1986Hypsilophodontidae Bakker p. 461
1986Hypsilophodontidae Sereno
1987Hypsilophodontidae Buscalioni and Sanz p. 66
1988Hypsilophodontidae Carroll
1989Hypsilophodontidae Dong
1990Hypsilophodontidae Benton p. 19
1990Hypsilophodontidae Sues and Norman p. 500
1992Hypsilophodontidae Molnar p. 265
1992Hypsilophodontidae Weishampel and Heinrich p. 163
1996Hypsilophodontidae Coria and Salgado p. 454 fig. 13
1997Hypsilophodontidae Sereno p. 443
1998Hypsilophodontidae Sereno p. 61
1999Hypsilophodontidae Sereno p. 2138 fig. 2
2001Hypsilophodontidae Eberth et al. p. 57
2002Hypsilophodontidae Buchholz p. 21
2006Hypsilophodontidae Chure et al. p. 237
2007Hypsilophodontidae Sánchez-Hernández et al. p. 202
2014Hypsilophodontidae Alifanov and Saveliev p. 421
2020Hypsilophodontidae Dieudonné et al.

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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()
RankNameAuthor
—Romeriida
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Ornithischia()
—Genasauria
—Cerapoda
—Ornithopoda()
—Clypeodonta
—Hypsilophodontidae()
—Hypsilophodontidae()

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.

Unr. †Hypsilophodontidae Dollo 1882 [hypsilophodontid]
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G. †Daurosaurus Alifanov and Saveliev 2014
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†Daurosaurus olovus Alifanov and Saveliev 2014
G. †Hypsilophodon Huxley 1870
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†Hypsilophodon foxii Huxley 1870
Unr. †Parksosauridae Buchholz 2002
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G. †Gasparinisaura Coria and Salgado 1996
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†Gasparinisaura cincosaltensis Coria and Salgado 1996
G. †Vectidromeus Longrich et al. 2024
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†Vectidromeus insularis Longrich et al. 2024
Invalid names: Dryosaurinae Cooper 1985 [empty], Hypsilophodontinae Abel 1919 [empty], Kalodontidae Nopcsa 1901 [synonym], Laosauridae Marsh 1895 [synonym], Macelognathidae Marsh 1884 [synonym], Nanosaurinae Marsh 1878 [empty]
Diagnosis
ReferenceDiagnosis
L. Dollo 1882A single row of teeth. Four functional digits in the foot. Rhomboidal, uneven sternum.
B. F. Nopcsa 1901Intermaxillare fogakkal vagy fog nélkül, Mellsö csigolyák opistocoelok vagy laposak; 5–6 összenött sacrumcsigolya. Sternum néha csontosodva. Pubis az ischium távolabbi végéig ér. Femur rövidebb mint a tibia. A kézen 5, a Iábon 4 ujj van. Láliszárcsontok üresek. Körmök. (Laosauridae, Hypsilophodontidae, Marsh.)

[Intermaxillary with or without teeth, Trunk vertebrae opisthocoelous or flat; 5-6 fused sacrum vertebrae. Sternum sometimes ossified. Pubis reaches the distal end of the ischium. Femur shorter than tibia. The hand has 5 fingers and foot has 4 fingers. Laryngeal bones are empty. Nails. (Laosauridae, Hypsilophodontidae, Marsh.)]
B. F. Nopcsa 1901 (Kalodontidae)Faragott foguk csak egy sorban.

[Sculptured teeth in just one row.]
R. S. Lull 1924is family contains what are apparently the most primitive members of the Ornithopoda, especially as regards the teeth, which are in a single row as compared with the multiple rows in most of the other groups. They also possess premaxillary teeth. Anterior vertebrae platy- or opisthoccelous; sacrals coossified, and posterior ribs single-headed; hand five-fingered, fourth and fifth generally reduced; foot with four functional digits and vestigial fifth metatarsal. These are the lesser ornithopods, ranging apparently from the Upper Trias to the close of the Age of Reptiles.
B. F. Nopcsa 1928 (Kalodontidae)teeth comparatively few in number but strongly ornamented
F. v. Huene 1948Premaxilla with teeth; symphysis of mandible without teeth; ischium broad distally; long pubis; tibia shorter than femur; 7 cervicals; 5th finger directed backward. Wealden.
P. M. Galton 1972Maxillary and dentary teeth inset (longitudinal recess to maxilla, massive dentary) with randomly formed wear surfaces that are not all in the same plane; no canine teeth or large rostral beak.
D. B. Weishampel and R. E. Heinrich 19921) absence of ridges that culminate in marginal denticles on the heavily enamelled surface of cheek teeth [21 ; reversed in Hypsilophodon],
2) presence of a cingulum on dentary teeth [24],
3) ossification of the sternal segments of the cranial dorsal ribs [26],
4) rod-shaped prepubic process [31].
V. R. Alifanov and S. V. Saveliev 2014Quadratojugal lacking contact with squamosal. Jugals not participating in formation of preorbital fenestrae. Mandibular fenestrae absent. Preacetabular process of pubis elongated. Ilia extended longitudinally. Obturator process of ischia present.