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
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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.
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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
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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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