Taxonomy
Over fifty species worldwide have been placed in (sub)genus ''Megastomia'' Monterosato, 1884 by a number of authors (e.g. Saurin, 1959, 1962; Peñas & Rolán, 1999; Giannuzzi-Savelli et al. (2014). On the basis of 16s mtDNA sequence data, Schander et al. (2003) distinguished, and placed in ''Megastomia'', two species (''M. conoidea'' (Brocchi, 1814) and ''M. corimbensis'' (Schander, 1994)), which clustered separately from other species placed in ''Species
Species within the genus ''Megastomia'' include: * '' Megastomia adiposa'' (Laseron, 1959) * '' Megastomia adolphi'' (Saurin, 1959) * '' Megastomia algoensis'' (Thiele, 1925) * '' Megastomia aliter'' Penas & Rolan, 1999 * '' Megastomia alungata'' (Nordsieck, 1972) * '' Megastomia ampliata'' (Saurin, 1962) * '' Megastomia atrisaxi'' (Saurin, 1959) * '' Megastomia bedoti'' (Hornung & Mermod, 1924) * '' Megastomia binhdinhensis'' (Saurin, 1958) * '' Megastomia boteroi'' (Schander, 1994) * '' Megastomia broti'' (Hornung & Mermod, 1924) * '' Megastomia canaria'' (Hedley, 1907) * '' Megastomia canina'' Penas & Rolan, 1999 * '' Megastomia caudana'' (Saurin, 1959) * '' Megastomia charneri'' (Saurin, 1959) * '' Megastomia clara'' (Nomura, 1936) * '' Megastomia conoidea'' (Brocchi, 1814) * '' Megastomia conspicua'' (Alder, 1850) * '' Megastomia corimbensis'' Schander, 1994 * '' Megastomia coseli'' Penas & Rolan, 1999 * '' Megastomia desmiti'' (van Aartsen, Gittenberger & Goud, 1998) * † '' Megastomia doliella'' (Laws, 1940) * '' Megastomia gea'' (Bartsch, 1915) * '' Megastomia gestroi'' (Hornung & Mermod, 1924) * '' Megastomia gestroides'' (Saurin, 1958) * '' Megastomia gilsoni'' (Dautzenberg, 1912) * '' Megastomia gordonis'' (Yokoyama, 1922) * '' Megastomia gutta'' Penas & Rolan, 1999 * '' Megastomia interolineata'' (Nomura, 1936) * '' Megastomia jacundior'' (Nomura, 1937) * † '' Megastomia kaawa'' (Laws, 1940) * '' Megastomia kamakurana'' (Nomura, 1938) * '' Megastomia kuroshiwo'' (Nomura, 1939) * '' Megastomia makiyamai'' (Nomura, 1937) * † '' Megastomia marginalis'' (Laws, 1940) * '' Megastomia martinae'' (Saurin, 1959) * '' Megastomia metayei'' (Saurin, 1959) * '' Megastomia miuraensis'' (Nomura, 1937) * '' Megastomia neoexigua'' (Nomura, 1937) * '' Megastomia nhatrangensis'' (Saurin, 1959) * '' Megastomia pagodiformis'' (Schander, 1994) * '' Megastomia palmaensis'' Penas & Rolan, 1999 * '' Megastomia pernettae'' (Saurin, 1959) * '' Megastomia pseudoperforata'' (Nomura, 1939) * '' Megastomia pyramidata'' (Laseron, 1951) * '' Megastomia regina'' (Thiele, 1925) * '' Megastomia ruris'' Penas & Rolan, 1999 * '' Megastomia sagamiana'' (Nomura, 1937) * '' Megastomia saurini'' (Corgan & Van Aartsen, 1998) * '' Megastomia serenei'' (Saurin, 1959) * † '' Megastomia simemacula'' (Laws, 1940) * '' Megastomia simplex'' (Angas, 1871) * '' Megastomia sitirighamana'' (Nomura, 1938) * '' Megastomia subcarina'' (Laseron, 1951) * '' Megastomia subcostata'' (Saurin, 1959) * '' Megastomia subscripta'' (Schander, 1994) * '' Megastomia sulcifera'' (E.A. Smith, 1871) * '' Megastomia supramarginata'' (Saurin, 1959) * '' Megastomia tenera'' (A. Adams, 1860) * '' Megastomia troncosoi'' Peñas & Rolán, 2002 * '' Megastomia turbiniformis'' Penas & Rolan, 1999 * '' Megastomia turukoae'' Nomura, 1938 * '' Megastomia unifilosa'' (Saurin, 1962) * † '' Megastomia venusta'' (Laws, 1940) * '' Megastomia vero'' (Nomura, 1937) * '' Megastomia winfriedi'' Penas & Rolan, 1999 * '' Megastomia yabehisakatsui'' (Nomura, 1936) * '' Megastomia yukikoae'' (Nomura, 1938) * '' Megastomia zaleuca'' (Melvill, 1910) * '' Megastomia zijpi'' (van Aartsen, Gittenberger & Goud, 1998) ;The following species were brought into synonymy: * ''Megastomia elata'' (Saurin, 1958): synonym of ''Megastomia saurini'' (Corgan & Van Aartsen, 1998) * ''Megastomia conoidea'' (Brocchi, 1884: synonym of '' Odostomia conoidea'' (Brocchi, 1814) * ''Megastomia conspicua'' (Alder, 1850): synonym of ''References
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