Dinosaur size

Size is and has been one of the most fascinating aspects of dinosaur paleontology, to both the general public and professional scientists. Dinosaurs show some of the most extreme variations in size of any land animal group, ranging from the tiny hummingbirds, which can weigh as little as three grams, to the extinct titanosaurs, which could weigh as much as 90 tonnes (89 long tons; 99 short tons).[1]

For other large prehistoric reptiles (or birds), see Largest prehistoric animals § Reptiles (Reptilia).

Reconstructed skeleton of the titanosaur Argentinosaurus huinculensis, often considered the largest-known dinosaur
An adult male bee hummingbird, the smallest known dinosaur and the smallest extant

Scientists will probably never be certain of the largest and smallest dinosaurs. This is because only a small fraction of animals ever fossilize, and most of these remain buried in the earth and will never be found. Few of the specimens that are recovered are complete skeletons, and impressions of skin and other soft tissues are rarely discovered. Rebuilding a complete skeleton by comparing the size and morphology of bones to those of similar, better-known species is an inexact art, and reconstructing the muscles and other organs of the living animal is, at best, a process of educated guesswork, and never perfect.[2] Weight estimates for dinosaurs are much more variable than length estimates, because estimating length for extinct animals is much more easily done from a skeleton than estimating weight. Estimating weight is most easily done with the laser scan skeleton technique that puts a "virtual" skin over it, but even this is only an estimate.[3]

The latest evidence suggests that dinosaur average size varied through the Triassic, early Jurassic, late Jurassic and Cretaceous periods, and dinosaurs probably only became widespread during the Jurassic.[4] Predatory theropod dinosaurs, which occupied most terrestrial carnivore niches during the Mesozoic, most often fall into the 100- to 1,000-kilogram (220 to 2,200 lb) category when sorted by estimated weight into categories based on order of magnitude, whereas recent predatory carnivoran mammals peak in the 10- to 100-kilogram (22 to 220 lb) category.[5] The mode of Mesozoic dinosaur body masses is between one and ten metric tonnes.[6] This contrasts sharply with the size of Cenozoic mammals, estimated by the National Museum of Natural History as about 2 to 5 kg (4.4 to 11.0 lb).[7]

Record sizes

The sauropods were the longest and heaviest dinosaurs. For much of the dinosaur era, the smallest sauropods were larger than anything else in their habitat, and the largest were an order of magnitude more massive than anything else that has walked the Earth since. Giant prehistoric mammals such as Paraceratherium and Palaeoloxodon (the largest land mammals ever discovered[8]) were dwarfed by the giant sauropods, and only modern whales surpass them in weight, though they live in the oceans.[9] There are several proposed advantages for the large size of sauropods, including protection from predation, reduction of energy use, and longevity, but it may be that the most important advantage was dietary. Large animals are more efficient at digestion than small animals, because food spends more time in their digestive systems. This also permits them to subsist on food with lower nutritive value than smaller animals. Sauropod remains are mostly found in rock formations interpreted as dry or seasonally dry, and the ability to eat large quantities of low-nutrient browse would have been advantageous in such environments.[10]

Scale diagram comparing a human and the largest-known dinosaurs of five major clades

One of the tallest and heaviest dinosaurs known from good skeletons is Giraffatitan brancai (previously classified as a species of Brachiosaurus). Its remains were discovered in Tanzania between 1907 and 1912. Bones from several similar-sized individuals were incorporated into the skeleton now mounted and on display at the Museum für Naturkunde Berlin;[11] this mount is 12–13.27 metres (39.4–43.5 ft) tall and 21.8–22.5 metres (72–74 ft) long,[12][13][14] and would have belonged to an animal that weighed between 30,000 to 60,000 kilograms (66,000 to 132,000 lb). One of the longest complete dinosaurs is the 27-metre-long (89 ft) Diplodocus, which was discovered in Wyoming in the United States and displayed in Pittsburgh's Carnegie Natural History Museum in 1907.[15]

There were larger dinosaurs, but knowledge of them is based entirely on a small number of fragmentary fossils. Most of the largest herbivorous specimens on record were discovered in the 1970s or later, and include the massive titanosaur Argentinosaurus huinculensis, which is the largest dinosaur known from uncontroversial evidence, estimated to have been 50–96.4 metric tons (55.1–106.3 short tons)[16] and 30–39.7 m (98–130 ft) long.[17][18] Some of the longest sauropods were those with exceptionally long, whip-like tails, such as the 29–33.5-metre-long (95–110 ft) Diplodocus hallorum[10][18] (formerly Seismosaurus) and the 33- to 35-metre-long (108–115 ft) Supersaurus.[19][18]

In 2014, the fossilized remains of a previously unknown species of sauropod were discovered in Argentina.[20] The titanosaur, named Patagotitan mayorum, would have been around 40m long and weighed around 77 tonnes, larger than any other previously found sauropod. The specimens found were remarkably complete, significantly more so than previous titanosaurs. Research as of 2017 estimated Patagotitan to have been 37 m (121 ft) long [21] It has also been suggested that Patagotitan is not necessarily larger than Argentinosaurus and Puertasaurus.[22]

Skeleton of Giganotosaurus, one of the largest theropods known.

Tyrannosaurus was for many decades the largest and best known theropod to the general public. Since its discovery, however, a number of other giant carnivorous dinosaurs have been described, including Spinosaurus, Carcharodontosaurus, and Giganotosaurus.[23] These large theropod dinosaurs rivaled or even exceeded Tyrannosaurus in size, though more recent studies show some indication that Tyrannosaurus, although shorter, was the heavier predator. Specimens such as Sue and Scotty are both estimated to be the most massive theropods known to science. There is still no clear explanation for exactly why these animals grew so much larger than the land predators that came before and after them.

The largest extant theropod is the common ostrich, up to 2.74 metres (9 ft 0 in) tall and weighs between 63.5 and 145.15 kilograms (140.0 and 320.0 lb).[24]

The smallest non-avialan theropod known from adult specimens may be Anchiornis huxleyi, at 110 grams (3.9 ounces) in weight and 34 centimetres (13 in) in length.[25] However, some studies suggest that Anchiornis was actually an avialan.[26] The smallest dinosaur known from adult specimens which is definitely not an avialan is Parvicursor remotus, at 162 grams (5.7 oz) and measuring 39 centimetres (15 in) long.[27] When modern birds are included, the bee hummingbird Mellisuga helenae is smallest at 1.9 g (0.067 oz) and 5.5 cm (2.2 in) long.[28]

Recent theories propose that theropod body size shrank continuously over the past 50 million years, from an average of 163 kilograms (359 lb) down to 0.8 kg (1.8 lb), as they eventually evolved into modern birds. This is based on evidence that theropods were the only dinosaurs to get continuously smaller, and that their skeletons changed four times faster than those of other dinosaur species.[29][30]

Sauropodomorphs
Main article: Sauropodomorpha
Size comparison of selected giant sauropod dinosaurs

Sauropodomorph size is difficult to estimate given their usually fragmentary state of preservation. Sauropods are often preserved without their tails, so the margin of error in overall length estimates is high. Mass is calculated using the cube of the length, so for species in which the length is particularly uncertain, the weight is even more so. Estimates that are particularly uncertain (due to very fragmentary or lost material) are preceded by a question mark. Each number represents the highest estimate of a given research paper. One large sauropod, Maraapunisaurus fragillimus, was based on particularly scant remains that have been lost since their description by paleontologists in 1878. Analysis of the illustrations included in the original report suggested that M. fragillimus may have been the largest land animal of all time, possibly weighing 100–150 t (110–170 short tons) and measuring between 40–60 m (130–200 ft) long.[18][31] One later analysis of the surviving evidence, and the biological plausibility of such a large land animal, suggested that the enormous size of this animal was an over-estimate due partly to typographical errors in the original report.[32] This would later be challenged by a different study, which argued Cope's measurements were genuine and there's no basis for assuming typographical errors. The study, however, also reclassified the species and correspondingly gave a much lower length estimate of 30.3 metres (99 ft) and a mass of 78.5 t (86.5 short tons).[33]

Generally, the giant sauropods can be divided into two categories: the shorter but stockier and more massive forms (mainly titanosaurs and some brachiosaurids), and the longer but slenderer and more light-weight forms (mainly diplodocids).

Because different methods of estimation sometimes give conflicting results, mass estimates for sauropods can vary widely causing disagreement among scientists over the accurate number. For example, the titanosaur Dreadnoughtus was originally estimated to weigh 59.3 tonnes by the allometric scaling of limb-bone proportions, whereas more recent estimates, based on three-dimensional reconstructions, yield a much smaller figure of 22.1–38.2 tonnes.[34]

Heaviest sauropodomorphs
  1. Maraapunisaurus fragilimus (Amphicoelias fragilimus) : 78.5–120 tonnes (86.5–132.3 short tons)[35][36]
  2. Argentinosaurus huinculensis: 50–100 t (55–110 short tons)[16][18][37][31]
  3. Puertasaurus reuili: 45–100 tonnes (50–110 short tons)[38][36]
  4. Barosaurus lentus: 12.2–100 tonnes (13.4–110.2 short tons)[39][40]
  5. Mamenchisaurus sinocanadorum: 50–80 t (55–88 short tons)[41]
  6. Patagotitan mayorum: 50–77 t (55–85 short tons)[42][36]
  7. Notocolossus gonzalezparejasi: 44.9–75.9 t (49.5–83.7 short tons)[16]
  8. Alamosaurus sanjuanensis: 39.5–73 t (43.5–80.5 short tons)[16][18][43]
  9. Apatosaurus ajax: 32.7–72.6 t (36.0–80.0 short tons)[44]

Longest sauropodomorphs
  1. Barosaurus lentus: 26–48 metres (85–157 ft)[39][40]
  2. Maraapunisaurus fragilimus (Amphicoelias fragilimus) : 30.2–40 metres (99–131 ft)[35][36]
  3. Puertasaurus reuili: 27–40 metres (89–131 ft)[45][38]
  4. Argentinosaurus huinculensis: 27–39.7 m (89–130 ft)[46][21][45]
  5. Patagotitan mayorum: 31–37 m (102–121 ft)[10][17][18][47][36]
  6. Supersaurus vivianae: 32–35 m (105–115 ft)[10][19][18]
  7. Ruyangosaurus giganteus: 30 – 35 m (98–115 ft)[48][49]
  8. Diplodocus hallorum: 29–35 m (95–115 ft)[18][19][50][51]
  9. Alamosaurus sanjuanensis: 28–35 m (92–115 ft)[18][52][50]
  10. Sauroposeidon proteles: 28–34 m (92–112 ft) [50] [53]

Shortest sauropods
  1. Ohmdenosaurus liasicus: 4–6.7 m (13–22 ft)[50]
  2. Blikanasaurus cromptoni: 4–5 m (13–16 ft)[18][50]
  3. Lirainosaurus astibiae: 4–7 m (13–23 ft)[18][54]
  4. Magyarosaurus dacus: 5.3–6 m (17–20 ft)[18][50]
  5. Europasaurus holgeri: 5.7–6.2 m (19–20 ft)[18][50][55]
  6. Vulcanodon karibaensis: 6.5–11 m (21–36 ft)[18][50]
  7. Isanosaurus attavipachi: 6.5–17 m (21–56 ft)[50][56]
  8. Saltasaurus loricatus: 7–12.8 m (23–42 ft)[18][57][47]
  9. Neuquensaurus australis: 7–15 m (23–49 ft)[50][58]
  10. Antetonitrus ingenipes: 8–12.2 m (26–40 ft)[50][59]

Lightest sauropods
  1. Blikanasaurus cromptoni: 0.25 t (0.28 short tons)[18]
  2. Astrodon johnstoni: 0.5 t (0.55 short tons)[37]
  3. Europasaurus holgeri: 0.75–1 t (0.83–1.10 short tons)[18][37][55]
  4. Magyarosaurus dacus: 0.75–1.1 t (0.83–1.21 short tons)[37][60]
  5. Bonatitan reigi: 1 t (1.1 short tons)[37]
  6. Lirainosaurus astibiae: 1–4 t (1.1–4.4 short tons)[18][37][54]
  7. Lapparentosaurus madagascariensis: 1.4 t (1.5 short tons)[37]
  8. Antetonitrus ingenipes: 1.5–5.6 t (1.7–6.2 short tons)[18][37]
  9. Lessemsaurus sauropoides: 1.8 t (2.0 short tons)[37]
  10. Neuquensaurus australis: 1.8 t (2.0 short tons)[18]

Lightest non-sauropod sauropodomorphs
  1. Eoraptor lunensis: 2–17.3 kg (4.4–38.1 lb)[18][37]
  2. Pampadromaeus barberenai: 8.5 kg (19 lb)[37]
  3. Saturnalia tupiniquim: 10–10.6 kg (22–23 lb)[18][37]
  4. Chromogisaurus novasi: 13.1 kg (29 lb)[37]
  5. Asylosaurus yalensis: 25 kg (55 lb)[18]
  6. Guaibasaurus candelariensis: 25–30.3 kg (55–67 lb)[18][37]
  7. Adeopapposaurus mognai: 43.9–70 kg (97–154 lb)[18][37]
  8. Coloradisaurus brevis: 70 kg (150 lb)[18]
  9. Anchisaurus polyzelus: 70–137.6 kg (154–303 lb)[18][37]
  10. Sarahsaurus aurifontanalis: 100.2 kg (221 lb)[37]

Shortest non-sauropod sauropodomorphs
Eoraptor compared in size to a human.
  1. Agnosphitys cromhallensis: 70 cm (2.3 ft)[50]
  2. Eoraptor lunensis: 1–1.7 m (3.3–5.6 ft)[18][50]
  3. Pampadromaeus barberenai: 1.5 m (4.9 ft)[50]
  4. Saturnalia tupiniquim: 1.5 m (4.9 ft)[50]
  5. Chromogisaurus novasi: 1.5 m (4.9 ft)[50]
  6. Guaibasaurus candelariensis: 2 m (6.6 ft)[18][50]
  7. Asylosaurus yalensis: 2–2.1 m (6.6–6.9 ft)[18][50]
  8. Leyesaurus marayensis: 2.1 m (6.9 ft)?[50]
  9. Adeopapposaurus mognai: 2.1–3 m (6.9–9.8 ft)[18][50]
  10. Unaysaurus tolentinoi: 2.5 m (8.2 ft)[50]

Theropods
Main article: Theropoda

Sizes are given with a range, where possible, of estimates that have not been contradicted by more recent studies. In cases where a range of currently accepted estimates exist, sources are given for the sources with the lowest and highest estimates, respectively, and only the highest values are given if these individual sources give a range of estimates. Some other giant theropods are also known; for example, a theropod trackmaker in Morocco that was perhaps between 10 and 19 metres (33 and 62 ft) long, but the information is too scarce to make precise size estimates.[61][62]

Heaviest theropods
  1. Spinosaurus aegyptiacus: 6–20.9 t (6.6–23.0 short tons)[63][64][65]
  2. Tyrannosaurus rex: 4.5–18.5 t (5.0–20.4 short tons)[66][67][68][69]
  3. Deinocheirus sp. : 16 t (18 short tons)[70]
  4. Carcharodontosaurus saharicus: 3–15.1 t (3.3–16.6 short tons)[37][71][64]
  5. Giganotosaurus carolinii: 4.16–13.8 t (4.59–15.21 short tons) [37][43][64][72][73]
  6. Acrocanthosaurus atokensis: 1.9–7.3 t (2.1–8.0 short tons)[37][67][74][75][76]
  7. Oxalaia quilombensis: 5–7 t (5.5–7.7 short tons)[77]
  8. Tyrannotitan chubutensis: 4.9–7 t (5.4–7.7 short tons)[18][37]
  9. Therizinosaurus cheloniformis: 5–7.2 t (5.5–7.9 short tons)[18][50]
  10. Deinocheirus mirificus: 5–6.4 t (5.5–7.1 short tons)[78][18]
  11. Chilantaisaurus tashuikouensis: 2.5–6 t (2.8–6.6 short tons)[79][80]

Longest theropods
Size comparison of selected giant theropod dinosaurs
  1. Spinosaurus aegyptiacus: 15–18 m (49–59 ft)[81]
  2. Deinocheirus sp.: 15.7 m (52 ft)[70]
  3. Epanterias amplexus: 12.1–15.2 m (40–50 ft)[73][82]
  4. Sigilmassasaurus brevicollis: 14.4 m (47 ft)[70]
  5. Giganotosaurus carolinii: 12.2–14 m (40–46 ft)[18][83]
  6. Oxalaia quilombensis: 11–14 m (36–46 ft)[50][77]
  7. Saurophaganax maximus: 10.5–14 m (34–46 ft)[18][50][84]
  8. Mapusaurus roseae: 11.8–13.7 m (39–45 ft)?[73]
  9. Deltadromeus agilis: 9–13.3 m (30–44 ft)[73]
  10. Carcharodontosaurus saharicus: 12–13.28 m (39.4–43.6 ft)[23][50]
  11. Tyrannosaurus rex: 10-12.3m (33-40 ft)

Lightest theropods
  1. Mellisuga helenae: 2 g (0.071 oz)[85]
  2. Mellisuga minima: 2–2.4 g (0.071–0.085 oz)[86]
  3. Selasphorus rufus: 2–5 g (0.071–0.176 oz)[87]
  4. Lophornis magnificus: 2.1 g (0.074 oz)[88][89]
  5. Atthis heloisa: 2.2 g (0.078 oz)[89]
  6. Lophornis brachylophus: 2.7 g (0.095 oz)[90]
  7. Calypte costae: 3.38–4.43 g (0.119–0.156 oz)[91]
  8. Calypte anna: 3.85–5.33 g (0.136–0.188 oz)[91]
  9. Cratoavis cearensis: 4 g (0.14 oz)[70]
  10. Gerygone albofrontata: 5.5–10 g (0.19–0.35 oz)[92][93][94]

Shortest theropods
  1. Mellisuga helenae: 5–6 cm (2.0–2.4 in)[89][95]
  2. Mellisuga minima: 6 cm (2.4 in)[86]
  3. Lophornis magnificus: 6.5–7 cm (2.6–2.8 in)[88][89]
  4. Cratoavis cearensis: 6.6 cm (2.6 in)[70]
  5. Dicaeum ignipectus: 7 cm (2.8 in)-[96]
  6. Chaetocercus heliodor: 7 cm (2.8 in)[97]
  7. Myrmia micrura: 7 cm (2.8 in)[98]
  8. Lophornis brachylophus: 7–7.5 cm (2.8–3.0 in)[90]
  9. Atthis heloisa: 7–7.5 cm (2.8–3.0 in)[99]
  10. Selasphorus rufus: 7–9 cm (2.8–3.5 in)[87]
  11. Regulus regulus: 8.5–9.5 cm (3.3–3.7 in)[100]

Shortest non-avialan theropods
Size comparison of the smallest non-avialan theropods
  1. Unnamed (BEXHM: 2008.14.1): 16–50 cm (6.3–19.7 in)[101][102]
  2. Epidexipteryx hui: 25–30 cm (9.8–11.8 in)[18][103]
  3. "Ornithomimus" minutus: 30 cm (12 in)[50]
  4. Palaeopteryx thompsoni: 30 cm (12 in)?[50]
  5. Parvicursor remotus: 30–39 cm (12–15 in)[27][50]
  6. Nqwebasaurus thwazi: 30–100 cm (12–39 in)[18][50]
  7. Mei long: 45–70 cm (18–28 in)[18][50]
  8. Xixianykus zhangi: 50 cm (20 in)[50]
  9. Jinfengopteryx elegans: 50–55 cm (20–22 in)[104][18]

Lightest non-avialan theropods
  1. Parvicursor remotus: 137–200 g (4.8–7.1 oz)[27][37][18]
  2. Epidexipteryx hui: 164–391 g (5.8–13.8 oz)[37][103][18]
  3. Compsognathus longipes: 0.26–9 kg (0.57–19.84 lb)[71][64]
  4. Ceratonykus oculatus: 0.3–1 kg (0.66–2.20 lb)[37][18]
  5. Zhongjianosaurus yangi: 0.31 kg (0.68 lb)[105]
  6. Ligabueino andesi: 0.35–0.5 kg (0.77–1.10 lb)[18][37]
  7. Yi qi: 0.38 kg (0.84 lb)[106]
  8. Microraptor zhaoianus: 0.4–0.6 kg (0.88–1.32 lb)[37][18]
  9. Mahakala omnogovae: 0.4–0.79 kg (0.88–1.74 lb)[18][67][37]
  10. Mei long: 0.4–0.85 kg (0.88–1.87 lb)[18][37]

Ornithopods
Main article: Ornithopoda

Longest ornithopods
Size comparison of several large ornithopods
  1. Shantungosaurus giganteus: 14.7–18.7 m (48–61 ft)[71][50][107][108][109]
  2. Edmontosaurus annectens: 12–15.2 m (39–50 ft)[50][18][110][111][111]
  3. Hypsibema crassicauda: 15 m (49 ft)?[50]
  4. Hypsibema missouriensis (Parrosaurus):[50] 15 m (49 ft)?[50]
  5. Iguanodon bernissartensis: 10–13 m (33–43 ft)[50][112]
  6. Charonosaurus jiayinensis: 10–13 m (33–43 ft)[18][113]
  7. Edmontosaurus regalis: 9–13 m (30–43 ft)[18][114][115]
  8. Magnapaulia laticaudus: 12.5 m (41 ft)[116]
  9. Saurolophus angustirostris: 12 m (39 ft)[18][117]
  10. Ornithotarsus immanis: 12 m (39 ft)?[50]

Heaviest ornithopods
  1. Shantungosaurus giganteus: 9.9–22.5 t (10.9–24.8 short tons)[18][37][71][118]
  2. Iguanodon seeleyi: 15.3 t (16.9 short tons)[37]
  3. Edmontosaurus annectens: 3–13.2 t (3.3–14.6 short tons)[31][71][119][111]
  4. Saurolophus angustirostris: 5–11 t (5.5–12.1 short tons)[37][120]
  5. Iguanodon bernissartensis: 3.08–8.3 t (3.40–9.15 short tons)[37][121]
  6. Edmontosaurus regalis: 4–7.6 t (4.4–8.4 short tons)[37][118]
  7. Brachylophosaurus canadensis: 4.5–7 t (5.0–7.7 short tons)[18][37]
  8. Lanzhousaurus magnidens: 6 t (6.6 short tons)[18]
  9. Parasaurolophus walkeri: 2.5–5.1 t (2.8–5.6 short tons)[37][71][122][123]
  10. Charonosaurus jiayinensis: 5 t (5.5 short tons)[18]

Shortest ornithopods
  1. Gasparinisaura cincosaltensis: 0.65–1.7 m (2.1–5.6 ft)[18][71][50]
  2. Leaellynasaura amicagraphica: 0.9–3 m (3.0–9.8 ft)[18][50]
  3. Valdosaurus canaliculatus: 1.3 m (4.3 ft)[18]
  4. Notohypsilophodon comodorensis: 1.3 m (4.3 ft)[18]
  5. Fulgurotherium australe: 1.3–2 m (4.3–6.6 ft)[18][50]
  6. Siluosaurus zhangqiani: 1.4 m (4.6 ft)[50]
  7. Qantassaurus intrepidus: 1.4–2 m (4.6–6.6 ft)[18][50]
  8. Changchunsaurus parvus: 1.5 m (4.9 ft)[18]
  9. Thescelosaurus sp.: 1.5 m (4.9 ft)[71]
  10. Yandusaurus hongheensis: 1.5–3.8 m (4.9–12.5 ft)[18][50]

Lightest ornithopods
  1. Gasparinisaura cincosaltensis: 1–13 kg (2.2–28.7 lb)[18][37][71][67]
  2. Yueosaurus tiantaiensis: 3.9 kg (8.6 lb)[37]
  3. Fulgurotherium australe: 6 kg (13 lb)[18]
  4. Notohypsilophodon comodorensis: 6 kg (13 lb)[18]
  5. Yandusaurus hongheensis: 6.6–7.5 kg (15–17 lb)[31][71]
  6. Hypsilophodon foxii: 7–21 kg (15–46 lb)[18][31][71]
  7. Thescelosaurus sp.: 7.9–86 kg (17–190 lb)[31][71]
  8. Valdosaurus canaliculatus: 10 kg (22 lb)[18]
  9. Haya griva: 11 kg (24 lb)[37]
  10. Agilisaurus louderbacki: 12 kg (26 lb)[18]

Ceratopsians
Main article: Ceratopsia

Longest ceratopsians
Size of selected Ceratopsids
  1. Eotriceratops xerinsularis: 8.5 m (28 ft)[18]
  2. Triceratops horridus: 8 m (26 ft)[18]
  3. Triceratops prorsus: 8 m (26 ft)[18]
  4. Torosaurus latus: 8 m (26 ft)[18]
  5. Ojoceratops fowleri: 8 m (26 ft)[50]
  6. Titanoceratops ouranos: 6.5–6.8 m (21–22 ft)[18][124]
  7. Pachyrhinosaurus canadensis: 6 m (20 ft)[18]
  8. Achelousaurus horneri: 6 m (20 ft)[18]
  9. Albertaceratops nesmoi: 5.8 m (19 ft)[18]
  10. Pentaceratops sternbergii: 5.5 m (18 ft)[18]

Heaviest ceratopsians
  1. Triceratops horridus: 9–13.5 t (9.9–14.9 short tons)[18][37]
  2. Triceratops prorsus: 9–10.9 t (9.9–12.0 short tons)[18][37]
  3. Ojoceratops fowleri: 4.5–10.8 t (5.0–11.9 short tons)[18][37]
  4. Bravoceratops polyphemus: 10 t (11 short tons)[18]
  5. Pachyrhinosaurus canadensis: 3–4.4 t (3.3–4.9 short tons)[18][37]
  6. Styracosaurus albertensis: 1.8–4.2 t (2.0–4.6 short tons)[18][37]
  7. Albertaceratops nesmoi: 3.5 t (3.9 short tons)[18]
  8. Chasmosaurus russelli: 1.5–3.5 t (1.7–3.9 short tons)[18][37]
  9. Chasmosaurus belli: 2–3.1 t (2.2–3.4 short tons)[18][37]
  10. Pentaceratops sternbergii: 2.5 t (2.8 short tons)[18]

Shortest ceratopsians
  1. Yamaceratops dorngobiensis: 50 cm (1.6 ft)[18]
  2. Liaoceratops yanzigouensis: 50 cm (1.6 ft)[18]
  3. Archaeoceratops yujingziensis: 55 cm (1.80 ft)[125]
  4. Microceratus gobiensis: 60 cm (2.0 ft)[50]
  5. Bagaceratops rozhdestvenskyi: 80 cm (2.6 ft)[18]
  6. Archaeoceratops oshimai: 80–90 cm (2.6–3.0 ft)[125][18]
  7. Psittacosaurus lujiatunensis: 90 cm (3.0 ft)[18]
  8. Micropachycephalosaurus hongtuyanensis: 100 cm (3.3 ft)[126]
  9. Chaoyangsaurus youngi: 100 cm (3.3 ft)[18]
  10. Xuanhuaceratops niei: 100 cm (3.3 ft)[18]

Lightest ceratopsians
  1. Liaoceratops yanzigouensis: 2 kg (4.4 lb)[18]
  2. Yamaceratops dorngobiensis: 2 kg (4.4 lb)[18]
  3. Psittacosaurus sinensis: 4.1–6 kg (9.0–13.2 lb)[37][18]
  4. Psittacosaurus lujiatunensis: 5 kg (11 lb)[18]
  5. Yinlong downsi: 5.5–10 kg (12–22 lb)[37][18]
  6. Micropachycephalosaurus hongtuyanensis: 5.9 kg (13 lb)[37]
  7. Chaoyangsaurus youngi: 6 kg (13 lb)[18]
  8. Xuanhuaceratops niei: 6 kg (13 lb)[18]
  9. Psittacosaurus gobiensis: 6–9.4 kg (13–21 lb)[18][37]
  10. Bagaceratops rozhdestvenskyi: 7 kg (15 lb)[18]

Pachycephalosaurs
Main article: Pachycephalosauria

Longest pachycephalosaurs
Size comparison of an adult P. wyomingensis (green), potential growth stages, and a human
  1. Pachycephalosaurus wyomingensis: 4.5 m (15 ft)[18][50]
  2. Stygimoloch spinifer: 3 m (9.8 ft)[50]
  3. Gravitholus albertae: 3 m (9.8 ft)?[50]

Shortest pachycephalosaurs
  1. Wannanosaurus yansiensis: 60 cm (2.0 ft)[50]
  2. Colepiocephale lambei: 1.8 m (5.9 ft)[50]
  3. Texacephale langstoni: 2 m (6.6 ft)[50]

Thyreophorans
Main article: Thyreophora

Longest thyreophorans
Size of Stegosaurus ungulatus (orange) and S. stenops (green) compared to a human
Estimated size of Ankylosaurus compared to a human.
  1. Stegosaurus ungulatus: 7–9 m (23–30 ft)[18][50]
  2. Stegosaurus stenops: 6.5–9 m (21–30 ft)[18][50]
  3. Cedarpelta bilbeyhallorum: 5–9 m (16–30 ft)[18][50][127]
  4. Dacentrurus armatus: 7–8 m (23–26 ft)[18][50][128]
  5. Ankylosaurus magniventris: 6.25–8 m (20.5–26.2 ft)[50][129][130]
  6. Tarchia gigantea: 4.5–8 m (15–26 ft)[18][50]
  7. Sauropelta edwardsorum: 5–7.6 m (16–25 ft)[18][71][50][127][131]
  8. Dyoplosaurus acutosquameus: 7 m (23 ft)?[50]
  9. Tuojiangosaurus multispinus: 6.5–7 m (21–23 ft)[18][71][50]
  10. Wuerhosaurus homheni: 6.1–7 m (20–23 ft)[18][50]

Heaviest thyreophorans
  1. Ankylosaurus magniventris: 4.8–8 t (5.3–8.8 short tons)[18][37][71][130]
  2. Dacentrurus armatus: 5–7.4 t (5.5–8.2 short tons)[18][37]
  3. Stegosaurus ungulatus: 3.8–7 t (4.2–7.7 short tons)[18][37]
  4. Stegosaurus stenops: 2.6–5.3 t (2.9–5.8 short tons)[18][71][123][132]
  5. Cedarpelta bilbeyhallorum: 5 t (5.5 short tons)[18]
  6. Hesperosaurus mjosi: 3.5–5 t (3.9–5.5 short tons)[18][37][132]
  7. Tuojiangosaurus multispinus: 1.1–4.8 t (1.2–5.3 short tons)[37][71]
  8. Wuerhosaurus homheni: 4 t (4.4 short tons)[18]
  9. Niobrarasaurus coleii: 4 t (4.4 short tons)[18]
  10. Gobisaurus domoculus: 3.5 t (3.9 short tons)[18]

Shortest thyreophorans
  1. Tatisaurus oehleri: 1.2 m (3.9 ft)[50]
  2. Scutellosaurus lawleri: 1.2–1.3 m (3.9–4.3 ft)[18][50]
  3. Dracopelta zbyszewskii: 2–3 m (6.6–9.8 ft)[18][50]
  4. Minmi paravertebra: 2–3 m (6.6–9.8 ft)[18][50]

Lightest thyreophorans
  1. Scutellosaurus lawleri: 3 kg (6.6 lb)[18]
  2. Emausaurus ernsti: 50 kg (110 lb)[18]
  3. Scelidosaurus harrisonii: 64.5–270 kg (142–595 lb)[18][71]
  4. Animantarx ramaljonesi: 300 kg (660 lb)[18]
  5. Struthiosaurus transylvanicus: 300 kg (660 lb)[18]
  6. Struthiosaurus austriacus: 300 kg (660 lb)[18]
  7. Gargoyleosaurus parkpinorum: 300 kg (660 lb)[18]
  8. Mymoorapelta maysi: 300 kg (660 lb)[18]
  9. Minmi paravertebra: 300 kg (660 lb)[18]
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See also

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