Truncatellidae



































Truncatellidae

Truncatella subcylindrica DSCN3140.JPG
Two live individuals of Truncatella subcylindrica: a juvenile on the left, and an adult on the right

Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily:
Truncatelloidea
Family:
Truncatellidae


Gray, 1840[1]

Truncatellidae, common name the "looping snails", is a family of small amphibious snails, with gills and an operculum, semi-marine gastropod mollusks or micromollusks.




Contents






  • 1 Shell description


  • 2 Subfamilies


  • 3 Genera


  • 4 Habitat


  • 5 Life cycle


  • 6 References


  • 7 External links





Shell description




Drawing of a shell of Truncatella bilabiata


This family of snails have small shells which lose their apical whorls as they continue to grow, giving the shells a truncated and cylindrical appearance.



Subfamilies


The family Truncatellidae consists of two subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005):[2]



  • subfamily Truncatellinae Gray, 1840

  • subfamily Geomelaniinae Kobelt & Möllendorff, 1897[3]



Genera


Genera within the family Truncatellidae include:


Truncatellinae



  • Truncatella Risso, 1826[4] - type genus of the family Truncatellidae[2]

Geomelaniinae



  • Geomelania L. Pfeiffer, 1845 - type genus of the subfamily Geomelaniinae[2]

subfamily ?



  • †Nystia


  • Taheitia Adams, 1863[4]



Habitat


Snails in this family are found in marine coastal environments, near or just above the high tide line on stones and pebbles, fine sediments and decomposing vegetation.



Life cycle


The sexes are separate. Fertilized eggs are laid as egg capsules, which are attached to detritus.



References





  1. ^ Gray (1840). Synopsis of the contents of the British Museum ed. 42: 117, 148.


  2. ^ abc Bouchet, Philippe; Rocroi, Jean-Pierre; Frýda, Jiri; Hausdorf, Bernard; Ponder, Winston; Valdés, Ángel & Warén, Anders (2005). "Classification and nomenclator of gastropod families". Malacologia. Hackenheim, Germany: ConchBooks. 47 (1–2): 1–397. ISBN 3-925919-72-4. ISSN 0076-2997..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}


  3. ^ Kobelt & Möllendorff (1897). Nachrichtsblatt der Deutschen Malakozoologischen Gesellschaft 29(5-6): 74.


  4. ^ ab "Mollusca" Archived 2012-06-26 at the Wayback Machine. Diversidad Biológica Cubana, accessed 23 March 2011.




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