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Caecum glabrum.jpg
Caecum glabrum
Caecum glabrum (protoconch).jpg
Juvenile showing protoconch.
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily: Truncatelloidea
Family: Caecidae
Gray, 1850

See text.

Caecidae is a taxonomic family of very small and minute sea snails or micromolluscs, marine gastropod molluscs in the order Littorinimorpha.[1]


These minute tubular shells can be found living in marine sediment, or among algae or sponges, in warm and temperate seas.

Shell description[edit]

The shells in this family, are unusual in that the adult shell is a curving tube. In the subfamily Caecinae the protoconch is lost and the tube is sealed with a permanent calcareous plug at one end. In the subfamilies Ctiloceratinae and Strebloceratinae the protoconch is retained. At the other end the tube is sealed by a circular operculum. The spiral part is almost always lost when outgrowing the juvenile stage. The color of the shell is white to pale yellow.


This family contains three subfamilies :

  • Caecinae Gray, 1850
  • Ctiloceratinae Iredale & Laseron, 1957
  • Strebloceratinae Bandel, 1996


Genera brought into synonymy 
  • Brochina Gray, 1857: synonym of Caecum Fleming, 1813
  • Brochus T. Brown, 1827: synonym of Caecum Fleming, 1813
  • Micranellum Bartsch 1900: synonym of Caecum Fleming, 1813
  • Moreletia de Folin, 1869: synonym of Parastrophia de Folin, 1869
  • Odontidium Philippi, 1836: synonym of Caecum Fleming, 1813
  • Pedumicra Iredale & Laseron, 1957: synonym of Parastrophia de Folin, 1869
  • Phleboceras de Folin, 1868: synonym of Strebloceras Carpenter, 1859
  • Pictocaecum Habe 1978: synonym of Caecum Fleming, 1813
  • Spirolidium O. G. Costa, 1861: synonym of Parastrophia de Folin, 1869: synonym


  1. ^ Bouchet, P.; Gofas, S. (2013). Caecidae. Accessed through: World Register of Marine Species at on 2013-06-04
  2. ^ WoRMS : Jayella accessed : 18 October 2010