Tectus

Tectus is a genus of sea snails, marine gastropod mollusks in the family Tegulidae.

Description
The shell has a pyramidal shape. Its base is flat, without false-umbilicus. The rhomboidal aperture is very oblique, angular, and wider than long. The outer lip is lirate within. The columella is very short, vertical, with a strong spiral fold, ending anteriorly in a knob or point.

Distribution
This marine genus has a wide distribution. It occurs in the Persian Gulf, the Red Sea, in the Central and East Indian Ocean and off East Africa, Oceania, Indo-China, Indo-Malaysia, the Philippines, East India, Australia (New South Wales, Northern Territory, Queensland, Western Australia), Kermadec Islands, New Caledonia, Anadaman Islands.

Species
Species within the genus Tectus include:
 * † Tectus altavillensis (Defrance, 1828)
 * Tectus architectonicus A. Adams, 1853
 * † Tectus athenasi (Vasseur, 1882)
 * † Tectus aulacophorus (Cossmann & Pissarro, 1905)
 * † Tectus bareti (Vasseur, 1882)
 * † Tectus bourdoti (Cossmann & Pissarro, 1902)
 * † Tectus branderi (Defrance, 1828)
 * † Tectus britannus (Vasseur, 1882)
 * † Tectus chavani Glibert, 1962
 * † Tectus chenui Le Renard, 1994
 * † Tectus cognatus (J. de C. Sowerby, 1840)
 * † Tectus crenularis (Lamarck, 1804)
 * Tectus (Tectus) dentatus (Forskål in Niebuhr, 1775)
 * † Tectus extraconicus Gain, Belliard & Le Renard, 2019
 * Tectus fabrei (Montrouzier in Fischer, 1878)
 * Tectus fenestratus (Gmelin, 1791)
 * † Tectus fluctus Gain, Belliard & Le Renard, 2019
 * † Tectus fredevillensis Gain, Belliard & Le Renard, 2019
 * † Tectus funiculosus (Deshayes, 1832)
 * † Tectus gabrielis (d'Orbigny, 1850)
 * † Tectus gervillii Gain, Belliard & Le Renard, 2019
 * † Tectus leae Gain, Belliard & Le Renard, 2019
 * † Tectus margaritaceus (Deshayes, 1832)
 * Tectus mauritianus (Gmelin, 1791)
 * † Tectus monilifer (Lamarck, 1804)
 * † Tectus montissanctipetri (Binkhorst, 1861)
 * † Tectus morgani (Cossmann & Pissarro, 1905)
 * ''Tectus noduliferus' ' (Lamarck, 1822)
 * † Tectus ornatus (Lamarck, 1804)
 * † Tectus planibasis Gain, Belliard & Le Renard, 2019
 * Tectus pyramis (Born, 1778)
 * † Tectus richardi Gain, Belliard & Le Renard, 2019
 * Tectus royanus (Iredale, 1912)
 * † Tectus spinalis Gain, Belliard & Le Renard, 2019
 * † Tectus subcanaliculatus (Deshayes, 1863)
 * † Tectus torticostulus Gain, Belliard & Le Renard, 2019
 * Tectus triserialis (Lamarck, 1822)


 * Species brought into synonymy :
 * Tectus concavus (Gmelin, 1791) : synonym of Infundibulum concavum (Gmelin, 1791)
 * Tectus conus (Gmelin, 1791) : synonym of Rochia conus (Gmelin, 1791)
 * Tectus elatus (Lamarck, 1822) : synonym of Rochia elata (Lamarck, 1822)
 * Tectus magnificus Poppe, 2004 : synonym of Rochia magnifica (Poppe, 2004 )
 * Tectus maximus (Koch in Philippi, 1844) : synonym of Rochia maxima (Koch, 1844)
 * Tectus niloticus (Linnaeus, 1767) : synonym of Rochia nilotica (Linnaeus, 1767)
 * Tectus pagodalis Montfort, 1810 : synonym of Tectus mauritianus (Gmelin, 1791)
 * Tectus tentorium (Gmelin, 1791) : synonym of Trochus tentorium Gmelin, 1791
 * Tectus tabidus Reeve, L.A., 1861 : synonym of Tectus pyramis (Born, 1778)
 * Tectus virgatus (Gmelin, 1791) : synonym of Rochia virgata (Gmelin, 1791)