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Browse Records Total Records: 789
# Taxon Nominal Author Taxon Status Definitional Author Defn Type
1 Abelisauria Novas 1992b inactive    
2 Abelisauridae Bonaparte and Novas 1985 active Sereno 2005 stem
3 Abelisaurinae Bonaparte and Novas 1985 inactive    
4 Abelisauroidea Bonaparte and Novas 1985 active Wilson et al. 2003 node
5 Aberratiodontuidae Gong et al. 2004 inactive    
6 Aberratiodontuiformes Gong et al. 2004 inactive    
7 Acanthopholidae Nopcsa 1917 inactive    
8 Acanthopholididae Nopcsa 1902 inactive    
9 Acanthopholinae Nopcsa 1917 inactive    
10 Acrocanthosauridae Molnar 2003 inactive    
11 Aegyptosuchidae Kuhn 1936 inactive    
12 Aeolosaurini Franco-Rosas et al. 2004 inactive    
13 Aerialae Ji and Ji 2001 inactive    
14 Aethosauridae Baur 1887 inactive    
15 Aetosauria Nicholson and Lydekker 1889 active Sereno 2005 stem
16 Aetosauridae Nicholson and Lydekker 1889 (also Cope 1889) inactive    
17 Aetosaurinae Nicholson and Lydekker 1889 inactive    
18 Aetosauroidea Nicholson and Lydekker 1889 inactive    
19 Agathaumidae Cope 1891 inactive    
20 Albertosaurinae Currie et al. 2003 active Sereno 2005 stem
21 Alexornithidae Brodkorb 1978 inactive    
22 Alexornithiformes Brodkorb 1978 inactive    
23 Alligatorellidae Tornier 1933 inactive    
24 Allophagi Jaekel 1914 inactive    
25 Allosauria Paul 1988 inactive    
26 Allosauridae Marsh 1878 active Sereno 2005 stem
27 Allosaurinae Marsh 1878 inactive    
28 Allosauroidea Marsh 1878 active Sereno 2005 stem
29 Alvarezsauridae Bonaparte 1991 active Sereno 2005 stem
30 Alxasauridae Russell and Dong 1993 inactive    
31 Ambiortidae Kurochkin 1982 inactive    
32 Ambiortiformes Kurochkin 1982 inactive    
33 Ammosauridae Romer 1956 inactive    
34 Amphicoelia Owen 1860 inactive    
35 Amphicoelidae Nopcsa 1923 inactive    
36 Amphicoeliidae Cope 1877 inactive    
37 Amphisauridae Marsh 1882 inactive    
38 Anchisauria Galton and Upchurch 2004 inactive    
39 Anchisauridae Marsh 1885 inactive    
40 Anchisaurinae Marsh 1885 inactive    
41 Andesauridae Calvo and Bonaparte 1991 inactive    
42 Andesaurinae Calvo and Bonaparte 1991 inactive    
43 Andesauroidea Calvo and Bonaparte 1991 inactive    
44 Angistorhinidae Camp 1930 inactive    
45 Angistorhininae Camp 1930 active Sereno 2005 stem
46 Ankylopollexia Sereno 1986 active Sereno 2005 node
47 Ankylosauria Osborn 1923 active Sereno 2005 stem
48 Ankylosauridae Brown 1908 active Sereno 1998 stem
49 Ankylosaurinae Brown 1908 active Sereno 2005 stem
50 Ankylosauroidea Brown 1908 inactive    
51 Ankylosauromorpha Carpenter 2001 inactive    
52 Antarctosauridae Olshevsky 1978 inactive    
53 Antarctosauridae Olshevsky 1978 inactive    
54 Antarctosaurinae Olshevsky 1978 inactive    
55 Antrodemidae Stromer 1934 inactive    
56 Apatornithidae Fürbringer 1888 inactive    
57 Apatosauridae Huene 1927 inactive    
58 Apatosaurinae Huene 1927 inactive    
59 Apraedentalia Huene 1948 inactive    
60 Apraedentalidae Huene 1952 inactive    
61 Aptilonia Ji and Ji 2001 inactive    
62 Archaeopterygidae Huxley 1871 active Sereno 2005 stem
63 Archaeopterygiformes Lambrecht 1933 inactive    
64 Archaeopteryginae Huxley 1871 inactive    
65 Archaeornithes Gadow 1893 inactive    
66 Archaeornithoididae Elzanowski and Wellnhofer 1992 inactive    
67 Archaeosauria Romer 1966 inactive    
68 Archaeosuchia Romer 1966 inactive    
69 Archaeosuchidae Brown 1933 inactive    
70 Archosauria Cope 1869 active Sereno 2005 node
71 Arctometatarsalia Holtz 1994 inactive    
72 Argyrosaurinae Bonaparte 1987 inactive    
73 Armatosauria Zhao 1983 inactive    
74 Artzosuchidae Efimov 1983 inactive    
75 Asiaceratopsinae Nessov and Kaznyshkina 1989 inactive    
76 Asiahesperornithinae Nessov and Prizemlin 1991 inactive    
77 Aspidiotes Duméril and Bibron 1836 inactive    
78 Aspidota Jan 1857 inactive    
79 Astrodontidae Huene 1932 inactive    
80 Astrodontinae Huene 1932 inactive    
81 Atlantosauridae Marsh 1883 inactive    
82 Atlantosaurinae Marsh 1883 inactive    
83 Atoposauridae Gervais 1871 active Sereno 2005 stem
84 Aublysodontidae Nopcsa 1928 inactive    
85 Aublysodontinae Nopcsa 1928 inactive    
86 Avebrevicauda Paul 2002 inactive    
87 Avemetatarsalia Benton 1999 active Sereno 2005 stem
88 Avepectora Paul 2002 inactive    
89 Avepoda Paul 2002 inactive    
90 Averostra Paul 2002 inactive    
91 Aves Linnaeus 1758 active Sereno 2005 node
92 Avesuchia Benton 1999 inactive    
93 Avetheropoda Paul 1988 inactive    
94 Avialae Gauthier 1986 inactive    
95 Avifilopluma Gauthier and de Queiroz 2001 inactive    
96 Avimimidae Kurzanov 1981 inactive    
97 Avimimiformes Chatterjee 1991 inactive    
98 Avipelviens Lapparent 1955 inactive    
99 Avipoda Novas 1992 inactive    
100 Avisauridae Brett-Surman and Paul 1985 inactive    
101 Bagaceratopidae Alifanov 2003 inactive    
102 Bahariasauridae Huene 1948 inactive    
103 Baptornithidae American Ornithologists’ Union 1910 inactive    
104 Barapasauridae Jain et al. 1979 inactive    
105 Barusuchoidea Price 1945 inactive    
106 Baryonychidae Charig and Milner 1986 inactive    
107 Baryonychinae Charig and Milner 1986 active Holtz et al. 2004 stem
108 Baurusuchidae Price 1945 active Sereno 2005 stem
109 Baurusuchoidea Price 1945 inactive    
110 Bellusaurinae Dong 1970 inactive    
111 Belodontia Marsh 1895 inactive    
112 Belodontidae Cope 1871 inactive    
113 Bernissartidae Dollo 1883 inactive    
114 Bernissartinae Dollo 1883 inactive    
115 Blikanasauridae Galton and van Heerden 1985 inactive    
116 Blikanosaurini Galton and van Heerden 1985 inactive    
117 Bothriospondylidae Lydekker 1895 inactive    
118 Bothrosauropodidae Janensch 1929 inactive    
119 Bothrosauropodoidea Janensch 1929 inactive    
120 Brachiosauria Upchurch 1998 inactive    
121 Brachiosauridae Riggs 1904 active Sereno 2005 stem
122 Brachiosaurinae Riggs 1904 inactive    
123 Brachypoda Thulborn 1974 inactive    
124 Bradycnemidae Harrison and Walker 1975 inactive    
125 Bullatosauria Holtz 1994 inactive    
126 Caenagnathidae Sternberg 1940 active Sereno 2005 stem
127 Caenagnathinae Sternberg 1940 inactive    
128 Caenagnathoidea Sternberg 1940 active Sereno 2005 node
129 Camarasauridae Cope 1877 inactive    
130 Camarasaurinae Cope 1877 inactive    
131 Camarasauromorpha Salgado et al. 1997 inactive    
132 Camptonotidae Marsh 1884 inactive    
133 Camptosauria Norman 1998 inactive    
134 Camptosauridae Marsh 1885 active Sereno 2005 stem
135 Camptosaurinae Marsh 1885 inactive    
136 Camptosauroidea Marsh 1885 inactive    
137 Candidodontidae Carvalho et al. 2004 inactive    
138 Carcharodontosauridae Stromer 1931 active Sereno 2005 stem
139 Cardiodontidae Marsh 1896 inactive    
140 Carinatae Merrem 1813 active Sereno 2005 node
141 Carnosauria Huene 1920 inactive    
142 Carnosauriformes Cooper 1985 inactive    
143 Carnosauroides Lapparent and Lavocat 1955 inactive    
144 Carnotaurinae Sereno 1998 active Sereno et al. 2004 stem
145 Carnotaurini Coria et al. 2002 inactive    
146 Cathayornithidae Zhou et al. 1992 inactive    
147 Cathayornithiformes Zhou et al. 1992 inactive    
148 Caudipteridae Zhou and Wang 2000 inactive    
149 Centrosaurinae Lambe 1915 active Sereno 2005 stem
150 Cerapoda Sereno 1986 inactive    
151 Ceratopsia Marsh 1890 active Sereno 2005 stem
152 Ceratopsidae Marsh 1888 active Sereno 2005 node
153 Ceratopsinae Marsh 1888 active Sereno 2005 stem
154 Ceratopsoidea Marsh 1888 active Sereno 2005 stem
155 Ceratopsomorpha Wolfe and Kirkland 1998 inactive    
156 Ceratosauria Marsh 1884 active Sereno 2005 stem
157 Ceratosauroidea Marsh 1884 inactive    
158 Cerritosauridae Bonaparte 1971 inactive    
159 Ceteosauria Osborn 1903 inactive    
160 Cetiosauria Seeley 1874 inactive    
161 Cetiosauridae Lydekker 1888 inactive    
162 Cetiosaurinae Lydekker 1888 inactive    
163 Chaoyangornithiformes Hou 1997 inactive    
164 Chaoyangsauridae Zhao et al. 1999 inactive    
165 Chasmosaurinae Lambe 1915 inactive    
166 Chasmosaurini Lambe 1915 inactive    
167 Chatterjeeidae Long and Murry 1995 inactive    
168 Chatterjeeinae Long and Murry 1995 active   node
169 Cheneosauridae Lull and Wright 1942 inactive    
170 Cheneosaurinae Lull and Wright 1942 inactive    
171 Chimaerasuchidae Carvalho et al. 2004 inactive    
172 Chirotheroidea Huene 1948 inactive    
173 Chubutisauridae Corro 1974 inactive    
174 Chuniaoae Ji et al. 1998 inactive    
175 Chuniaoia Ji and Ji 2001 inactive    
176 Claosauridae Marsh 1890 inactive    
177 Coelophysidae Nopcsa 1928 active Sereno 1998 node
178 Coelophysinae Nopcsa 1928 active Sereno 2005 stem
179 Coelophysoidea Nopcsa 1928 active Sereno 2005 stem
180 Coeluria Marsh 1881 inactive    
181 Coeluridae Marsh 1881 inactive    
182 Coeluroidea Nopcsa 1928 inactive    
183 Coelurosauria Huene 1914 active Sereno 2005 stem
184 Coelurosauridae Cope 1882 inactive    
185 Coelurosauroides Cope 1882 inactive    
186 Comahuesuchidae Bonaparte 1991 inactive    
187 Compsognatha Huxley 1870 inactive    
188 Compsognathia Paul 1988 inactive    
189 Compsognathidae Cope 1871 active Holtz et al. 2004 stem
190 Compsognathinae Cope 1871 inactive    
191 Concornithidae Kurochkin 1996 inactive    
192 Confuciusornithidae Hou et al. 1995 active Sereno 2005 stem
193 Confuciusornithiformes Hou et al. 1995 inactive    
194 Congosauridae Dollo 1914 inactive    
195 Congosaurinae Dollo 1914 inactive    
196 Coronosauria Sereno 1986 active Sereno 2005 node
197 Corythosaurini Glut 1997 inactive    
198 Cricosaurinae Lydekker 1888 inactive    
199 Crocodiloidea Fitzinger 1826 inactive    
200 Crocodiloidei Eichwald 1831 inactive    
201 Crocodilomorphi Hay 1930 inactive    
202 Crocodiluri Fitzinger 1843 inactive    
203 Crocodylia Gmelin 1789 active Brochu 2003 node
204 Crocodyliformes Hay 1930 active Sereno et al. 2001 node
205 Crocodyloidae Deraniyangala 1939 inactive    
206 Crocodylomorpha Hay 1930 active Sereno 2005 stem
207 Crocodylotarsi Benton and Clark 1988 inactive    
208 Crurotarsi Sereno and Arcucci 1990 active Sereno 2005 stem
209 Ctenosaurischidae Kuhn 1964 inactive    
210 Cuspirostrisornithidae Hou 1997 inactive    
211 Dacentruridae Blows 2001 inactive    
212 Dactylopodes Meyer 1845 inactive    
213 Deinocheiridae Osmólska and Roniewicz 1970 inactive    
214 Deinocheiridae Osmólska and Roniewicz 1970 inactive    
215 Deinocheirosauria Barsbold 1976 inactive    
216 Deinodontidae Brown 1914 inactive    
217 Deinodontinae Brown 1914 inactive    
218 Deinodontoidea Brown 1914 inactive    
219 Deinonychosauria Colbert and Russell 1969 active Sereno 2005 node
220 Desmatosuchia Case 1920 inactive    
221 Desmatosuchidae Case 1920 inactive    
222 Desmatosuchiformes Hay 1930 inactive    
223 Desmatosuchinae Case 1920 active Sereno 2005 stem
224 Dicraeosauridae Janensch 1929 active Sereno 2005 stem
225 Dicraeosaurinae Janensch 1929 inactive    
226 Dilophosauridae Madsen and Welles 1998 inactive    
227 Dilophosaurinae Madsen and Welles 1998 inactive    
228 Dinoaves Bakker 1986 inactive    
229 Dinosauria Owen 1842 active Sereno 2005 node
230 Dinosauriformes Novas 1992 active Novas 1992 node
231 Dinosauromorpha Benton 1985 active Sereno 2005 stem
232 Diplodocia Tornier 1933 inactive    
233 Diplodocidae Marsh 1884 active Sereno 2005 stem
234 Diplodocimorpha Calvo and Salgado 1995 inactive    
235 Diplodocinae Marsh 1884 inactive    
236 Diplodocoidea Marsh 1884 active Sereno 2005 stem
237 Dolichochampsidae Gasparini and Buffetaut 1980 inactive    
238 Dolichopoda Thulborn 1974 inactive    
239 Domocephalinae Sereno 1986 inactive    
240 Dromaeosauridae Matthew and Brown 1922 active Sereno 1998 stem
241 Dromaeosaurinae Matthew and Brown 1922 active Sereno 2005 stem
242 Dromaeosuchia Juul 1994 inactive    
243 Dromavialae Ji and Ji 2001 inactive    
244 Dryomorpha Sereno 1986 active Sereno 2005 stem
245 Dryosauridae Milner and Norman 1984 active Sereno 2005 stem
246 Dryosaurinae Milner and Norman 1984 inactive    
247 Dryptosauridae Marsh 1890 inactive    
248 Dyrosauridae Zittel 1923 inactive    
249 Dyrosaurinae Zittel 1923 active Sereno 2005 stem
250 Edmontoniinae Russell 1940 inactive    
251 Edmontosaurinae Horner 1990 inactive    
252 Edmontosaurini Horner 1992 active Sereno 2005 stem
253 Elachistosuchidae Hoffstetter 1955 inactive    
254 Elachistosuchoidea Hoffstetter 1955 inactive    
255 Elmisauridae Osmólska 1981 inactive    
256 Elopterygidae Lambrecht 1933 inactive    
257 Elopteryginae Lambrecht 1933 inactive    
258 Elosuchidae Lapparent de Broin 2002 inactive    
259 Emydosauri Gray 1825 inactive    
260 Emydosauria Blainville 1825 inactive    
261 Enaliornithidae Fürbringer 1988 inactive    
262 Enantiornithes Walker 1981 active Sereno 2005 stem
263 Enantiornithidae Nessov and Borkin 1983 inactive    
264 Enantiornithiformes Martin 1983 inactive    
265 Enantiornithomorpha Chiappe et al. 1999 inactive    
266 Enigmosauria Naish et al. 2001 inactive    
267 Enigmosauridae Barsbold and Perle 1983 inactive    
268 Eoceratopsinae Lambe 1915 inactive    
269 Eoenantiornithidae Hou et al. 1999 inactive    
270 Eoenantiornithiformes Hou et al. 1999 inactive    
271 Eoptilonia Ji and Ji 2001 inactive    
272 Epachthosaurinae Salgado 2003 inactive    
273 Episcoposaurinae Huene 1936 inactive    
274 Erectopodidae Huene 1932 inactive    
275 Erpetosuchidae Watson 1917 inactive    
276 Eucentrosaurinae Olshevsky 1991 inactive    
277 Eudinosauria Novas 1992 inactive    
278 Euenantiornithes Chiappe 2002 inactive    
279 Euhadrosauria Weishampel et al. 1993 inactive    
280 Euhelopodidae Romer 1956 inactive    
281 Euhelopodinae Romer 1956 inactive    
282 Euiguanodontia Coria and Salgado 1996 inactive    
283 Eumaniraptora Padian et al. 1997 active Maryanska et al. 2002 node
284 Euornithes Cope 1889 active Sereno 2005 stem
285 Euornithiformes Kurochkin 1996 inactive    
286 Euornithopoda Sereno 1986 active Sereno 2005 stem
287 Eurypoda Sereno 1986 active Sereno 1998 node
288 Eusaurischia Padian et al. 1999 inactive    
289 Eusauropoda Upchurch 1995 active Sereno 2005 stem
290 Eustreptospondylidae Paul 1988 inactive    
291 Eustreptospondylinae Paul 1988 active Sereno 2005 stem
292 Eusuchia Huxley 1875 active Sereno 2005 node
293 Eutitanosauria Sanz et al. 1999 inactive    
294 Fabrosauria Cooper 1985 inactive    
295 Fabrosauridae Galton 1972 inactive    
296 Fabrosauroidea Galton 1972 inactive    
297 Flagellicaudata Harris and Dodson 2004 active Sereno 2005 node
298 Garudimimidae Barsbold 1981 inactive    
299 Garudimiminae Barsbold 1981 inactive    
300 Genasauria Sereno 1986 active Sereno 2005 node
301 Geosauridae Andrews 1913 inactive    
302 Geosaurinae Andrews 1913 inactive    
303 Gobiosuchidae Osmólska 1972 inactive    
304 Gobipterygidae Elzanowski 1974 inactive    
305 Gobipterygiformes Elzanowski 1974 inactive    
306 Gondwanasuchia Carvalho et al. 2004 inactive    
307 Goniopholididae Cope 1875 active Sereno 2005 stem
308 Goniopholidiformes Hay 1930 inactive    
309 Goniopholidinae Lydekker 1887 inactive    
310 Goniopoda Cope 1866 inactive    
311 Goyocephalia Sereno 1986 inactive    
312 Grippidae Wiman 1928 inactive    
313 Grippidia Wiman 1933 inactive    
314 Gryponychidae Huene 1932 inactive    
315 Gryposaurinae Horner 1992 inactive    
316 Guaibasauridae Bonaparte et al. 1999 inactive    
317 Hadrosauria Huene 1908 inactive    
318 Hadrosauridae Cope 1869 active Sereno 2005 node
319 Hadrosauriformes Sereno 1997 active Sereno 1998 node
320 Hadrosaurinae Cope 1869 active Sereno 1998 stem
321 Hadrosaurini Cope 1869 inactive    
322 Hadrosauroidea Cope 1869 active Sereno 2005 stem
323 Hallopoda Marsh 1881 inactive    
324 Hallopodidae Marsh 1881 inactive    
325 Hallopodinae March 1881 inactive    
326 Halopodinae Marsh 1895 inactive    
327 Halticosauridae Huene 1956 inactive    
328 Haplocanthosauridae Bonaparte 1999 inactive    
329 Harpagmosauria Haekel 1866 inactive    
330 Harpagosauria Boulenger 1887 inactive    
331 Harpymimidae Barsbold and Perle 1984 inactive    
332 Helopodinae Huene 1932 inactive    
333 Hemiprotosuchidae Crush 1984 inactive    
334 Herrerasauria Galton 1985 inactive    
335 Herrerasauridae Benedetto 1973 active Sereno 2005 stem
336 Hesperornithes Fürbringer 1888 active Sereno 2005 stem
337 Hesperornithidae Marsh 1872 active Clarke 2004 stem
338 Hesperornithiformes Sharpe 1899 inactive    
339 Heterodontosauria Cooper 1985 inactive    
340 Heterodontosauridae Romer 1966 active Sereno 2005 stem
341 Homalocephalidae Dong 1978 inactive    
342 Homalocephaloidea Dong 1978 inactive    
343 Homalosauropodidae Janensch 1929 inactive    
344 Homalosauropodoidea Janensch 1929 inactive    
345 Hsisosuchidae Young and Chow 1953 inactive    
346 Huabeisauridae Pang and Cheng 2000 inactive    
347 Huayangosauridae Dong et al. 1982 inactive    
348 Huayangosaurinae Dong et al. 1982 inactive    
349 Hylaeochampsidae Williston 1925 inactive    
350 Hylaeochampsinae Williston 1925 inactive    
351 Hylaeosauridae Nopcsa 1902 inactive    
352 Hyperosauria Jaekel 1911 inactive    
353 Hyposaurinae Nopcsa 1928 inactive    
354 Hypsilophodontia Cooper 1985 inactive    
355 Hypsilophodontidae Dollo 1882 active Sereno 2005 stem
356 Hypsilophodontinae Dollo 1882 active Sereno 2005 stem
357 Hypsilophodontoidea Dollo 1882 inactive    
358 Hypsirhophidae Cope 1898 inactive    
359 Iberomesornithidae Sanz and Bonaparte 1992 inactive    
360 Iberomesornithiformes Sanz and Bonaparte 1992 inactive    
361 Ichthyornithes Marsh 1873 inactive    
362 Ichthyornithidae Marsh 1873 inactive    
363 Ichthyornithiformes Fürbringer 1888 inactive    
364 Iguanodontia Dollo 1888 active Sereno 2005 stem
365 Iguanodontidae Cope 1869 active Sereno 2005 stem
366 Iguanodontinae Abel 1919 inactive    
367 Iguanodontoidea Cope 1869 inactive    
368 Iliosuchidae Paul 1988 inactive    
369 Ingeniinae Barsbold 1981 active   node
370 Intertheropoda Paul 1988 inactive    
371 Irritatoridae Martill et al. 1996 inactive    
372 Itasuchidae Carvalho et al. 2004 inactive    
373 Itemiridae Kurzanov 1976 inactive    
374 Kalodontidae Nopcsa 1901 inactive    
375 Kalodontoidea Nopcsa 1901 inactive    
376 Kentrosauridae Blows 2001 inactive    
377 Kritosaurinae Lapparent and Lavocat 1955 inactive    
378 Kritosaurini Lapparent and Lavocat 1955 inactive    
379 Kuszholiidae Nessov 1992 inactive    
380 Labrosauridae Marsh 1884 inactive    
381 Lagerpetonidae Arcucci 1986 inactive    
382 Lagosuchia Chatterjee 1982 inactive    
383 Lagosuchidae Bonaparte 1975 inactive    
384 Lagosuchinae Bonaparte 1975 inactive    
385 Lambeosauria Horner 1990 inactive    
386 Lambeosauridae Parks 1923 inactive    
387 Lambeosaurinae Parks 1923 active Sereno 2005 stem
388 Laosauridae Marsh 1879 inactive    
389 Laosaurinae Marsh 1879 inactive    
390 Leptoceratopsidae Nopcsa 1923 active Makovicky 2001 stem
391 Leptoceratopsinae Nopcsa 1923 inactive    
392 Lesothosauridae Halstead and Halstead 1981 inactive    
393 Liaoningornithidae Hou 1997 inactive    
394 Liaoningornithiformes Hou 1997 inactive    
395 Libycosuchidae Stromer 1914 inactive    
396 Libycosuchinae Stromer 1914 inactive    
397 Lithostrotia Wilson and Upchurch 2003 active Wilson and Upchurch 2003 node
398 Lomasuchinae Carvalho et al. 2004 inactive    
399 Longipterygidae Zhang et al. 2001 inactive    
400 Longipterygiformes Zhang et al. 2001 inactive    
401 Loricata Merrem 1820 inactive    
402 Loricati Wiegmann and Ruthe 1843 inactive    
403 Macelognatha Marsh 1884 inactive    
404 Macelognathidae Marsh 1884 inactive    
405 Macronaria Wilson and Sereno 1998 active Sereno 2005 stem
406 Macrorhynchidae Koken 1887 inactive    
407 Mahajangasuchini Carvalho et al. 2004 inactive    
408 Maiasaurinae Horner 1992 inactive    
409 Maiasaurini Horner 1992 active Sereno 2005 stem
410 Mamenchisauridae Young and Chao 1972 inactive    
411 Mamenchisaurinae Young and Chao 1972 inactive    
412 Maniraptora Gauthier 1986 active Sereno 2005 stem
413 Maniraptoriformes Holtz 1995 active Sereno 2005 node
414 Marginocephalia Sereno 1986 active Sereno 2005 node
415 Massospondylidae Huene 1914 active Sereno 1998 stem
416 Megalosauri Fitzinger 1843 inactive    
417 Megalosauria Baur 1891 inactive    
418 Megalosauridae Huxley 1869 inactive    
419 Megalosaurinae Huxley 1869 inactive    
420 Megalosauroidea Huxley 1869 inactive    
421 Melanorosauridae Huene 1929 inactive    
422 Mesoeucrocodylia Whetstone and Whybrow 1983 active Sereno et al. 2001 stem
423 Mesorhinidae Huene 1936 inactive    
424 Mesorhinosuchidae Kuhn 1961 inactive    
425 Mesosauria Giebel 1847 inactive    
426 Mesosuchia Huxley 1875