Tectus

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.^[3]

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 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)^[4]
• † 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)^[5]
• † 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)^[6]
• † 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):^[7] synonym of Rochia conus (Gmelin, 1791)
• Tectus elatus (Lamarck, 1822): synonym of Rochia elata (Lamarck, 1822)
• Tectus magnificus Poppe, 2004:^[8] synonym of Rochia magnifica (Poppe, 2004)
• Tectus maximus (Koch in Philippi, 1844): synonym of Rochia maxima (Koch, 1844)
• Tectus niloticus (Linnaeus, 1767):^[9] 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):^[10] synonym of Rochia virgata (Gmelin, 1791)

• Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). ISBN 0-915826-22-4. XII, 195 pp
• Williams S.T., Karube S. & Ozawa T. (2008) Molecular systematics of Vetigastropoda: Trochidae, Turbinidae and Trochoidea redefined. Zoologica Scripta 37: 483–506

Wikimedia Commons has media related to Tectus.

• Montfort P. (Denys de). (1808-1810). Conchyliologie systématique et classification méthodique des coquilles. Paris: Schoell. Vol. 1: pp. lxxxvii + 409 [1808]. Vol. 2: pp. 676 + 16
• Schumacher, C. F. (1817). Essai d'un nouveau système des habitations des vers testacés. Schultz, Copenghagen. iv + 288 pp., 22 pls.
• Swainson, W. (1840). A treatise on malacology or shells and shell-fish. London, Longman. viii + 419 pp