TRILOBITE GENERA AND SPECIES LIST
for Genera beginning with letter M

Macannaia Jell, 1975

M. maladensis (Resser, 1939b)

Macropyge

M. gladiator Ross, 1951

Madaraspis

M. magnifica Fortey and Droser, 1996

Marjumia Walcott, 1916

M. bagginsi Melzak and Westrop, 1994 [Pika Fm.]
M. callas Walcott, 1916
M. cf. M. transversa (Palmer, 1968) [Pika Fm.]
M. typa Walcott, 1916
M. sp. (see Melzak and Westrop, 1994) [Pika Fm.]

Maryvillia Walcott, 1916b

M. arion
M. sp.

Mcnairia Deiss, 1939 [This genus is a junior synonym of Parehmania Deiss, 1939]

M. inornata Deiss, 1939 [Montana]

Menomonia Walcott, 1916a

M calymenoides 
M. semele  [=Densonella semele (Walcott, 1916)]
M. sp.  [=Densonella sp. (Weeks Fm., not yet described)]
M. sp. (Weeks Fm.)

Menoparia Ross, 1951

M. genalunata Ross, 1951

Mesonacis Walcott, 1885

M. eagerensis (Best)

M. n. sp.

Metabowmania

M. sp. nov. (Fillmore Fm.)

Meteoraspis Resser, 1935

M. dis

Mexicaspis Lochman, 1948

M. cf. difuntosensis Lochman, 1948

M. radiatus Palmer, in Palmer & Halley 1979

Mexicella Lochman, 1948

M. antelopea Sundberg and McCollum, 2000
M. grandoculus Palmer in Palmer & Halley 1979
M. granulata Eddy and McCollum, 1998
M. mexicana Lochman, 1948
M. obscurus Palmer in Palmer & Halley 1979
M. robusta Sundberg and McCollum, 2000
M. stator (Walcott, 1916)
M. sp. [Dome Limestone, western Utah]

Microryctocara Sundberg & McCollum, 1997

M. nevadensis Sundberg & McCollum, 1997 [Reported by Sundberg & McCollum, 2003b from the Monola Formation in California & the Emigrant Formation, western Nevada]

Modocia Walcott, 1924

M. brevispina Robison, 1964
[M. hewlisca (from the Weeks)] = "Modocia weeksensis"
M. hewlisca (type 1) (Weeks Fm.)
M. hewlisca (type 2) (Weeks Fm.)
M. hewlisca (type 3) (Weeks Fm.)
M. laevinucha Robison, 1964
M. sp. aff. M. laevinucha [Pierson Cove Fm., western Utah]
M. nuchaspina, Robison, 1964
M. typicalis (Resser, 1938)
"M. weeksensis" (Shanan Peters dissertation, 2003, unpubl.) - old name was Modocia hewlisca
M. sp. [Marjum Fm.]
M.? sp. [Marjum Fm.]

Minupeltis

M. conservator Palmer, 1960

Morosa

M. longispina Palmer, 1960

Mummaspis Fritz, 1992

M. oblisooculatus Fritz, 1992
M. sp. cf. M. oblisooculatus Fritz, 1992 [Mural Fm.]
M. occidens (Walcott, 1913)