Monotygma

Monotygma is a genus of sea snails, marine gastropod mollusks in the family Pyramidellidae, the pyrams and their allies. The status of this genus was for a long time confused, but the situation was clarified in a review by van Aartsen (1986).

Life habits
Little is known about the biology of the members of this genus. As is true of most members of the Pyramidellidae sensu lato, they are most likely to be ectoparasites.

Species
The following species are recognised in the genus Monotygma:


 * Monotygma acuminata (Gould, 1861)
 * Monotygma amoena (A. Adams, 1853)
 * Monotygma caelata (A. Adams, 1861)
 * Monotygma elata (Koenen, 1882) †
 * Monotygma enosima (Clessin, 1902)
 * Monotygma eximia (Lischke, 1872)
 * Monotygma fulva (A. Adams, 1853)
 * Monotygma granulata (A. Adams, 1853)
 * † Monotygma ivolasi (Mayer-Eymar 1900)
 * Monotygma julii (Saurin, 1959)
 * Monotygma lauta (A. Adams, 1853)
 * † Monotygma marcusseni (Schnetler, 2001)
 * Monotygma metula (A. Adams, 1861)
 * Monotygma pareximia (Nomura, 1936)
 * Monotygma puncticulata (Gould, 1861)
 * Monotygma punctigera (A. Adams, 1861)
 * Monotygma sinuata (Gould, 1861)
 * Monotygma striata Gray, 1847
 * Monotygma suturalis (A. Adams, 1853)
 * Monotygma watsoni (Hornung & Mermod, 1927)


 * Synonyms:
 * Monotygma casta (A. Adams, 1853) : synonym of Leucotina casta (A. Adams, 1853) (superseded combination)
 * Monotygma concinna (A. Adams, 1854) : synonym of Leucotina casta (A. Adams, 1853) (superseded combination)
 * Monotygma gavisa (Melvill, 1896) : synonym of Rissopsetia gavisa (Melvill, 1896)
 * Monotygma modesta (de Folin, 1870) : synonym of Careliopsis modesta (de Folin, 1870)
 * Monotygma pura (A. Adams, 1854) : synonym of Leucotina casta (A. Adams, 1853) (unaccepted > junior subjective synonym)