Diala

The whorls are not varicose, occasionally featuring nodules around the middle. The columella is relatively straight and not truncated. The outer lip is not thickened. ^[4]

Species within the genus Diala include:

• Diala albugo (Watson, 1886)^[5]
• Diala exilis (Tryon, 1866)
• Diala lirulata Thiele, 1930^[6]
• Diala megapicalis Ponder & de Keyzer, 1992^[7]
• Diala pusilla Thiele, 1930
• Diala semistriata (Philippi, 1849)^[8] - type species as Diala varia Adams A., 1861^[9]
• Diala stephensae (Baker, Hanna & Strong, 1930)
• Diala sulcifera (A. Adams, 1862)^[10] - synonym: Diala flammea (Pease, 1868)
• Diala suturalis (A. Adams, 1863)^[11] - synonym: Diala lauta (Adams)^[12]
• Diala virgata Hedley, 1899 (taxon inquirendum)

Species brought into synonymy

• Diala acuta Carpenter, 1864: synonym of Pseudodiala acuta (Carpenter, 1864)
• Diala africana Bartsch, 1915: synonym of Diala almo Bartsch, 1915
• Diala almo Bartsch, 1915: synonym of Hydrobiidae incertae sedis almo (Bartsch, 1915) (original combination)
• Diala basispiralis (Chapman-Smith & Grant-Mackie, 1971): synonym of Diala semistriata (Philippi, 1849)
• Diala cacuminata Laseron, 1956: synonym of Diala semistriata (Philippi, 1849)
• Diala capensis G. B. Sowerby III, 1889: synonym of Alaba pinnae (Krauss, 1848)
• Diala conica Turton, 1932: synonym of Diala semistriata (Philippi, 1849)
• Diala cornea A. Adams, 1861: synonym of Alaba cornea (A. Adams, 1861)
• Diala diffilata Laseron, 1956: synonym of Alaba diffilata (Laseron, 1956)
• Diala electrina Carpenter, 1864: synonym of Lirobarleeia Ponder, 1983
• Diala flammea Pease, 1868: synonym of Diala sulcifera (A. Adams, 1862)
• Diala fragilis Thiele, 1930: synonym of Alaba fragilis (Thiele, 1930)
• Diala fuscopicta E. A. Smith, 1890: synonym of Barleeia fuscopicta (E. A. Smith, 1890)
• Diala hartmeyeri Thiele, 1930: synonym of Alaba hartmeyeri (Thiele, 1930)
• Diala infrasulcata G.B. Sowerby III, 1892: synonym of Diala semistriata (Philippi, 1849)
• Diala lauta (Adams, 1862): synonym of Diala suturalis (A. Adams, 1863)
• Diala leithii (E. A. Smith, 1876): synonym of Mainwaringia leithii (E. A. Smith, 1876)
• Diala lirata Laseron, 1950: synonym of Diffalaba opiniosa Iredale, 1936
• Diala ludens Melvill & Standen, 1895: synonym of Diala albugo (Watson, 1886)
• Diala macula Nevill, 1885: synonym of Diala varia A. Adams, 1861: synonym of Diala semistriata (Philippi, 1849)
• Diala marmorea Carpenter, 1864: synonym of Pseudodiala acuta (Carpenter, 1864)
• Diala pinnae (Krauss, 1848): synonym of Alaba pinnae (Krauss, 1848)
• Diala planalba Laseron, 1956: synonym of Diala semistriata (Philippi, 1849)
• Diala polita Preston, 1905: synonym of Diala semistriata (Philippi, 1849)
• Diala simplex E. A. Smith, 1875: synonym of Barleeia simplex (E. A. Smith, 1875)
• Diala stricta Habe, 1960: synonym of Diala semistriata (Philippi, 1849)
• Diala tesselata Tenison-Woods, 1876: synonym of Alaba monile A. Adams, 1862
• Diala translucida Hedley, 1905: synonym of Styliferina translucida (Hedley, 1905)
• Diala trilirata Melvill, 1906: synonym of Diala semistriata (Philippi, 1849)
• Diala varia Adams A., 1861: synonym of Diala semistriata (Philippi, 1849)
• Diala vestigia Laseron, 1956: synonym of Diala semistriata (Philippi, 1849)
• Diala vitrea G. B. Sowerby III, 1915: synonym of Diffalaba vitrea (G. B. Sowerby III, 1915)
• Diala watsoni Laseron, 1956: synonym of Diala semistriata (Philippi, 1849)

Taxa inquirenda

• † Diala angustifera Nomura, 1935
• Diala fragilis (Fenaux, 1943)
• Diala lirata H. Adams & A. Adams, 1864
• Diala nodicincta H. Adams & A. Adams, 1864
• Diala succincta A. Adams, 1870 (unassessed, use in recent literature not established by editor)