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MACROPHALANGIA
MACRUROSAURUS
MAIASAURA
MAJUNGASAURUS
MAJUNGATHOLUS
MALAWISAURUS
MALEEVOSAURUS
MAMENCHISAURUS
MANDSCHUROSAURUS
MARSHOSAURUS
MASSOSPONDYLUS
MEGALOSAURUS
MELANOROSAURUS
METRIACANTHOSAURUS
MICROCERATOPS
MICROPACHY-
CEPHALOSAURUS

MICROVENATOR
MINMI
MONGOLOSAURUS
MONKONOSAURUS
MONOCLONIUS
MONONYKUS
MONTANOCERATOPS
MUSSAURUS
MUTTABURRASAURUS
 
MASSOSPONDYLUS
Pronunciation: mass-o-SPON-dih-lus  
Translation: Greater Vertebrae
Also Known As: Dromicosaurus, Aetonyx
Description: Herbivore, Quadrupedal, semi Bipedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Prosauropoda
Family: Massospondylidae
Height: 8 feet (2.4 meters)
Length: 19.7 feet (6 meters)
Weight:
Period: Early Jurassic


Notes: Found in South Africa, Massospondylus had a long neck and tail, bulky body with massive hands. Like all prosauropods, it was equipped to travel either bipedally or on all fours.


MEGALOSAURUS
Pronunciation: MEG-uh-lo-SAWR-us  
Translation: Big Lizard
Also Known As:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Ceratosauria
Family: Megalosauridae
Height: 12 feet (3.7 meters)
Length: 26 feet (8 meters)
Weight: 2,000 pounds (907 kg)
Period: Middle Jurassic and Early Cretaceous


Notes: The fragmentary remains of many carnosaurs have been assigned to Megalosaurus, making it something of a grab-bag classification. The first dinosaur bone on record to be discovered in 1677 in England. The remains of Megalosaurus and Iguanodon were the first to be recognized by 19th century scientists as dinosaurs. The two were portrayed in illustrations and in concrete, life-size statues as scaled-up lizards. The statues, first of their kind, still stand in London, England. The fragmentary remains of many dinosaurs have been assigned to Megalosaurus.


MELANOROSAURUS
Pronunciation: mel-uh-NOR-uh-SAWR-us  
Translation: Black Mountain Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Prosauropoda
Family: Melanorosauridae
Height: 14 feet (4.3 meters)
Length: 40 feet (12.2 meters)
Weight:
Period: Late Triassic


Notes: Found in South Africa, Melanorosaurus was one of the largest prosauropods. It had a bulky body, elephantine legs, and a long tail. Although like all prosauropods melanosaurids could stand upon their hinds legs, because of their great size they tended to walk on all fours.


METRIACANTHOSAURUS
Pronunciation: met-rih-ah-KANTH-uh-SAWR-us  
Translation: Moderately-Spined Lizard
Also Known As:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Infraorder: Ceratosauria
Family: Megalosauridae (not confirmed)
Height: 12 feet (3.7 meters)
Length: 26 feet (7.9 meters)
Weight:
Period: Late Jurassic


Notes: Found in southern England, Metriacanthosaurus had vertebrae with spines up to 10 inches (25.4 cm) long, perhaps supporting a skin sail. It has been speculated that the purpose of such skin sails was to aid in regulating body temperature.


MICROCERATOPS
Pronunciation: my-kro-SAIR-uh-tops  
Translation: Tiny Horned Face
Also Known As:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Ceratopsia
Micro-order Neoceratopsia
Family: Protoceratopsidae
Height: 18 inches (.6 meters)
Length: 30 inches (0.8 meters)
Weight: 4 pounds (1.8 kg)
Period: Late Cretaceous


Notes: Found in China, Microceratops is the smallest known horned dinosaur. A protoceratopsid, it probably resembled Protoceratops and Leptoceratops but the upper forelimb and hind limb bones of Microceratops are more slender. The entire hind limb is unusually long for a bird-hipped dinosaur when compared with the length of its trunk suggesting that Microceratops was capable of running on two legs. Its long forelimbs may have been used when walking on all fours.


MICROPACHYCEPHALOSAURUS
Pronunciation: my-kro-pak-ee-SEF-uh-lo-SAWR-us  
Translation: Small Thick-Headed Lizard
Also Known As:
Description: Herbivore, Bipedal
Order: Ornithischia
Suborder: Marginocephalia
Infraorder: Pachycephalosauria
Family: Pachycephalosauridae
Height: 1.2 feet (0.4 meters)
Length: 1.6 feet (0.5 meters)
Weight:
Period: Late Cretaceous


Notes: A tiny dinosaur, Micropachycephalosaurus is one of only two bone-head dinosaurs discovered to date in China. The other is Wannanosaurus, perhaps the most primitive flat-headed form of pachycephalosaur. Although Micropachycephalosaurus is one of the tiniest dinosaurs, it is burdened with the longest name. Despite its size, Micropachycephalosaurus has the typical features of other much larger pachycephalosaurids and some distinctive features of a valid species.


MICROVENATOR
Pronunciation: my-kro-VEN-uh-tor  
Translation: Tiny Hunter
Also Known As:
Description: Carnivore, Bipedal
Order: Saurischia
Suborder: Theropoda
Family:
Height: 2.5 feet (0.8 meters)
Length: 4 feet (1.2 meters)
Weight: 14 pounds (6.4 kg)
Period: Early Cretaceous


Notes: Microvenator is one of the smallest theropods, only a little larger than tiny Compsognathus. Because it displays characteristics that fit more than one family, Microvenator has not yet been assigned to a family.


MINMI
Pronunciation: MIN-mee  
Translation: Named for the Minmi Crossing in Queensland, Australia.
Also Known As:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Nodosauridae
Height: 4.5 feet (1.4 meters)
Length: 9.8 feet (3 meters)
Weight: 3,750 pounds (1,701 kg)
Period: Early Cretaceous


Notes: Minmi displays structures that differentiate it from other nodosaurs, most notably belly armor which is not known on other armored dinosaurs. Curiously, there is no evidence of armor on Minmi's back, a characteristic of more heavily armored and larger ankylosaurs. It also had bony plates on the side of its lower vertebrae, the purpose of which is unknown. The first ankylosaur found in Australia and the only one from the southern hemisphere, its presence there suggests a land route to Australia via South America during the Early Cretaceous Period. Minmi is also notable for being the dinosaur with the shortest name.


MONGOLOSAURUS
Pronunciation: mon-GO-luh-SAWR-us  
Translation: Mongolian Lizard
Also Known As:
Description: Herbivore, Quadrupedal
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family:
Height:
Length:
Weight:
Period: Early Cretaceous


Notes: The validity of Mongolosaurus as a genus is still in question as it is known only from fragmentary remains (teeth) found in Mongolia. It is related to, and may have resembled the titanosaurs.


MONKONOSAURUS
Pronunciation: mong-KON-uh-SAWR-us  
Translation: Monko Lizard
Also known as:
Description: Herbivore, Quadrupedal
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Stegosauria
Family: Stegosauridae
Height:
Length: 17 feet (5 meters)
Weight:
Period: Late Jurassic


Notes: Monkonosaurus had a twin row of plates running down its back. It resembled Stegosaurus, except that it had spikes on its shoulders.


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