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DINOSAUR STATISTIC update
Good day to all listmembers. As the year 2005 passes and 7 new genera joined
the ever growing dinosaur genera lists, I've also updated my database (Genera
per era table included). So here's what it currently (as of 5th May 2005) looks
like:
COUNTRIES PER NUMBER OF VALID DINOSAUR GENERA:
(=uncertain, validity doubted by some scientists)
1.) USA 138 (1)
2.) China 115 (1)
3.) Mongolia 59
4.) Argentina 56
5.) Canada 44
6.) UK 40 (1)
7.) France 22 (1)
8.) Portugal 18
9.) Nigeria 14
RSA 14
11.) Australia 13 (1)
12.) Brazil 13
13.) Spain 12
14.) Germany 11
Uzbekistan 11
16.) Morocco 10
17.) Tanzania 9 (1)
18.) India 9
19.) Romania 8
20.) Madagascar 7 (1)
21.) Lesotho 6
22.) Egypt 5
Russia 5
24.) Algeria 4
Thailand 4
Uruguay 4
Zimbabwe 4
28.) Mexico 3
Tunisia 3
30.) Kazakhstan 2 (1)
31.) Austria 2
Belgium 2
Japan 2
Kyrgyizstan 2
Malawi 2
Orange Free State 2
Switzerland 2
38.) Antarctica 1
Denmark 1
Chile 1
Croatia 1
Hungary 1
Italy 1
Laos 1
Lybia 1
Namibia 1
South Korea 1
Tajikistan 1
Tibet 1
...
Czech Republic (2) can't resist ;o)
Total of 689 genera (some occur in various countries), 557 valid genera known
as for 5th May 2005. 49 countries with at least 1 undoubtedly valid genus
listed so far.
CONTINENTS BY NUMBER OF VALID DINOSAUR GENERA:
(=uncertain, validity doubted by some scientists)
1.) ASIA 206 (3)
2.) NORTH AMERICA 182 (1)
3.) EUROPE 126 (2)
4.) AFRICA 82 (1)
5.) SOUTH AMERICA 74
6.) AUSTRALIA 13 (1)
7.) *CENTRAL AMERICA* 3
8.) ANTARCTICA 1
DINOSAUR GENERA PER ERA
PERIOD NUMBER LENGHT NUMBER PER MA
LATE TRIASSIC
Carnian 25 11.5 2.2
Norian 29 12.9 2.2
Rhaetian 10 4.0 2.5
EARLY JURASSIC
Hettangian 18 3.1 5.8
Sinemurian 23 6.9 3.3
Pliensbachian 20 6.6 3.0
Toarcian 13 7.4 1.8
MIDDLE JURASSIC
Aalenian 7 4.0 1.7
Bajocian 9 3.9 2.3
Bathonian 23 3.0 7.7
Callowian 30 3.5 8.6
LATE JURASSIC
Oxfordian 24 6.2 3.9
Kimmeridgian 59 4.2 14.0
Tithonian 42 5.3 7.9
EARLY CRETACEOUS
Berriasian 15 5.3 2.8
Valanginian 33 3.8 8.7
Hauterivian 36 6.4 5.6
Barremian 61 5.0 12.2
Aptian 60 13.0 4.6
Albian 68 12.4 5.5
LATE CRETACEOUS
Cenomanian 44 6.1 7.2
Turonian 33 4.2 7.9
Coniacian 18 3.8 4.7
Santonian 31 2.0 15.5
Campanian 131 12.9 10.1
Maastrichtian 112 5.1 22.0
Plus uncertain eras for 1 ET, 1 MJ, 1 LJ, 3 EC and 2 LC genera, so not included
here. OK, a request for help with the time assignment for these taxa:
Chuanjiesaurus, Genyodectes, Shanxia, Tianzhenosaurus and Pedopenna
Interesting trends in the distribution of dinosaur taxa through the
Mezozoic...most relevant data for any conclusions are in the rightmost column
(genera per 1 Ma in that era). Amazing values are IMHO mainly the rapid growth
in Hettangian, earliest Jurassic, than at the end of Jurassic in Kimmeridgian
(the value of 14.0 is then surpassed only after Santonian wiht 15.5), but
suppose it is caused by obviously better preservation of Kimmeridgian-age
formations in comparison with the EC ones. Another rapid growth of dinosaur
diversity would be in Santonian, continues (though declines somewhat) in a long
era of Campanian and culminates in Maastrichtian with 22 genera/Ma. Although
this is probably caused by the status of preservation for this youngest
Mezozoicum era, it also shows that dinosaur diversity wasn't much weakened
before the K-T event...I just can't resist loving the idea of Paleocene
hadrosaurs, BTW. Any comments, ideas?
NUMBER OF DINOSAUR GENERA ACCORDING TO STARTING LETTER
A 61
B 27
C 46
D 23
E 27
F 6
G 25
H 21
I 10
J 6
K 12
L 27
M 32
N 20
O 13
P 47
Q 4
R 16
S 62
T 42
U 5
V 8
W 2
X 4
Y 6
Z 5
Total of 557 valid genera (as of 5th May 2005).
MOST PROLIFIC YEARS BY NUMBER OF VALID DINOSAUR GENERA
(described that year)
1.) 2003 - 30
2.) 1998 - 26
3.) 2001 - 25
4.) 1999 - 24
5.) 2000 - 19
6.) 1996 - 18
7.) 2004 - 17
8.) 1991 - 16
9.) 1994 - 15
10.) 1979 - 13
11.) 1995 - 12
2002 - 12
13.) 1993 - 11
14.) 1877 - 9
1914 - 9
1973 - 9
1983 - 9
1990 - 9
19.) 1977 - 8
1980 - 8
1984 - 8
1985 - 8
23.) 1924 - 7
1933 - 7
1981 - 7
2005 - 7 (so far)
27.) 1932 - 6
1970 - 6
1974 - 6
1986 - 6
1989 - 6
1997 - 6
33.) 1972 - 5
1978 - 5
1987 - 5
1988 - 5
1992 - 5
38.) 1869 - 4
1903 - 4
1922 - 4
1923 - 4
1929 - 4
1975 - 4
1976 - 4
1982 - 4
46.) 1885 - 3
1889 - 3
1890 - 3
1902 - 3
1905 - 3
1913 - 3
1915 - 3
1928 - 3
1954 - 3
1964 - 3
56.) 1854 - 2
1859 - 2
1876 - 2
1891 - 2
1893 - 2
1908 - 2
1910 - 2
1911 - 2
1916 - 2
1925 - 2
1927 - 2
1936 - 2
1937 - 2
1942 - 2
1948 - 2
1950 - 2
1957 - 2
1960 - 2
1969 - 2
1971 - 2
77.) 1824 - 1
1825 - 1
1833 - 1
1836 - 1
1837 - 1
1838 - 1
1841 - 1
1848 - 1
1850 - 1
1856 - 1
1857 - 1
1861 - 1
1865 - 1
1866 - 1
1867 - 1
1870 - 1
1875 - 1
1878 - 1
1879 - 1
1881 - 1
1883 - 1
1884 - 1
1888 - 1
1894 - 1
1901 - 1
1904 - 1
1909 - 1
1912 - 1
1917 - 1
1919 - 1
1920 - 1
1921 - 1
1926 - 1
1931 - 1
1934 - 1
1939 - 1
1940 - 1
1941 - 1
1943 - 1
1947 - 1
1951 - 1
1952 - 1
1953 - 1
1955 - 1
1956 - 1
1958 - 1
1959 - 1
1962 - 1
1963 - 1
1965 - 1
1966 - 1
1967 - 1
1968 - 1
total of 128 years (from 181 year time from the first dinosaur description).
New dinosaur genera were described every year since 1949 (resp. 1950), 55 years
in a straight row.
As always, any comments appreciated.
"Memoria minuitur (...) nisi eam exerceas" Cicero