Architectonicidae

Architectonicidae, common name the staircase shells or sundials, are a family of sea snails, marine gastropod mollusks in the informal group "Lower Heterobranchia" (= Allogastropoda) of the clade Heterobranchia.

The extinct families † Amphitomariidae Bandel, 1994 and † Cassianaxidae Bandel, 1996 belong to the same superfamily.

Genera
Genera within the family Architectonicidae include:


 * Adelphotectonica Bieler, 1987
 * Aguayodiscus Jaume & Borro, 1946
 * Architectonica Röding, 1798 – type genus
 * Awarua Mestayer, 1930
 * Basisulcata Melone & Taviani, 1985
 * †Calodisculus Rehder, 1935
 * †Climacopoma Fischer, 1885
 * †Dinaxis Dall in Aldrich, 1895
 * †Discotectonica Marwick, 1931
 * †Disculus Deshayes, 1863
 * †Eosolarium Chavan, 1947
 * †Ewekorolaxis Adegoke, 1977
 * Grandeliacus Iredale, 1957 represented as Heliacus (Grandeliacus) Iredale, 1957 (alternate representation)
 * †Granoheliacus Melone & Taviani, 1985
 * †Granosolarium Sacco, 1892
 * Gyriscus Tiberi, 1867
 * Heliacus d'Orbigny, 1842
 * †Intitectonica Frassinetti & Covacevich, 1984
 * †Nigerialaxis Adegoke, 1977
 * †Nipteraxis Cossmann, 1916
 * †Nodosolarium Sacco, 1892
 * Paurodiscus Rehder, 1935
 * Philippia J. E. Gray, 1847
 * †Platylaxis Adegoke, 1977
 * Pseudomalaxis P. Fischer, 1885
 * †Pseudotorinia Sacco, 1892
 * Psilaxis Woodring, 1928
 * †Punjabia Eames, 1952
 * Pyrgoheliacus Bieler, 1987
 * RedivivusMelone & Taviani, 1985
 * †Rinaldoconchus Bandel, 1988
 * Solatisonax Iredale, 1931
 * Spirolaxis di Monterosato, 1913
 * †Stellaxis Dall, 1892
 * Teretropoma Rochebrune, 1881 represented as Heliacus (Teretropoma) Rochebrune, 1881 (alternate representation)
 * Torinista Iredale, 1936 represented as Heliacus (Torinista) Iredale, 1936 (alternate representation)
 * †Trimalaxis Garvie, 1996
 * †Wangaloa Finlay, 1927
 * Zerotula Finlay, 1927


 * Genera brought into synonymy:
 * Acutitectonica Habe, 1961: synonym of Discotectonica Marwick, 1931
 * Astronacus Woodring, 1959: synonym of Heliacus (Torinista) Iredale, 1936
 * Claraxis Iredale, 1936: synonym of Granosolarium Sacco, 1892
 * Discosolis Dall, 1892: synonym of Pseudomalaxis P. Fischer, 1885
 * Mangonuia Mestayer, 1930: synonym of Pseudomalaxis P. Fischer, 1885
 * †Patulaxis Dall, 1892: synonym of † Climacopoma Fischer, 1885
 * Russetia Garrard, 1961: synonym of Discotectonica Marwick, 1931
 * †Solariaxis Dall, 1892 : synonym of Granosolarium Sacco, 1892
 * Solarium Lamarck, 1799: synonym of Architectonica Röding, 1798
 * Torinia Gray, 1842 : synonym of Heliacus d'Orbigny, 1842