Morphologic Description: plocoid to subcerioid; strong septa in cycles of 8 or 10; prominent styliform columella.
Morphologic Diagnosis: Colony Form: subcerioid, cerioid, or plocoid, Colony Shape: branching or massive, Budding: extramural, Columella: styliform, Corallite Size: small ( < 1.5mm) or medium (1.5 - 10mm), Wall Structure: septothecal, Lobes: none.
Species (10 total):
M. asperula (Milne Edwards and Haime,
1849); CC species #16.5 (extant).
M. decactis (Lyman, 1859); CC species
#17 (extant).
M. decaseptata (Weisbord, 1971);
CC species #18 (extinct).
M. formosa Wells, 1973; CC species
#19 (extant).
M. cf. M. herricki Wells,
1934; CC species #21.8 (extinct). 
M. mirabilis (Duchassaing and Michelotti,
1860); CC species #20 (extant).
M. pharensis (Heller, 1868); CC species
#21 (extant).
M. sp. A.; CC species #21.5 (extinct).
M. sp. B.; CC species #21.6 (extinct).
M. sp. C.; CC species #21.7 (extinct).
