Knefastia

Knefastia is a genus of sea snails, marine gastropod mollusks in the family Pseudomelatomidae.

Taxonomy
This genus was previously included in the subfamily Cochlespirinae of the family Turridae.

Species
Species within the genus Knefastia include:
 * † Knefastia aenigmatica Landau, Da Silva & Heitz, 2016
 * Knefastia altenai Macsotay & Campos Villarroel, 2001
 * † Knefastia chira Olsson, 1931
 * †Knefastia coislinensis (Cossman, 1898)
 * † Knefastia crassinoda (Des Moulins, 1842 )
 * † Knefastia cubaguaensis Landau, Da Silva & Heitz, 2016
 * Knefastia dalli Bartsch, 1944
 * † Knefastia decipiens (Deshayes, 1865)
 * † Knefastia etteri Landau, Da Silva & Heitz, 2016
 * Knefastia funiculata (Kiener, 1840)
 * † Knefastia glypta Gardner, 1937
 * Knefastia hilli Petuch, 1990
 * Knefastia howelli (Hertlein & Strong, 1951)
 * † Knefastia kugleri Jung, 1965
 * † Knefastia limonensis Olsson, 1922
 * † Knefastia lindae Petuch, 1994
 * Knefastia nigricans (Dall, 1919)
 * Knefastia olivacea (Sowerby I, 1834)
 * † Knefastia polygona (Deshayes, 1834)
 * Knefastia princeps Berry, 1953
 * † Knefastia rouaulti (Cossmann, 1923)
 * † Knefastia sainti (de Boury, 1899)
 * Knefastia tuberculifera (Broderip & Sowerby I, 1829)
 * Knefastia walkeri Berry, 1958
 * † Knefastia waltonia Gardner, 1937
 * Species brought into synonymy:
 * Knefastia horrenda (Watson, 1886) : synonym of Stenodrillia horrenda (R. B. Watson, 1886)
 * † Knefastia lavinoides Olsson, 1922 : synonym of † Knefastia limonensis Olsson, 1922