Trisha Shetty (Editor)

Truncatella (gastropod)

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Kingdom
  
Animalia

Family
  
Truncatellidae

Scientific name
  
Truncatella

Higher classification
  
Truncatellidae

Superfamily
  
Rissooidea

Subfamily
  
Truncatellinae

Phylum
  
Mollusca

Rank
  
Genus

Truncatella (gastropod) httpsuploadwikimediaorgwikipediacommonsthu

Similar
  
Truncatella subcylindrica, Assiminea, Assimineidae, Amphisphaeriaceae, Seimatosporium

Truncatella is a genus of very small land snails with an operculum, terrestrial gastropod mollusks in the family Truncatellidae. These small and minute snails live on land, very close to seawater. They walk with a strange looping action, and the adults have truncated shells. Many of the species are small enough to be considered micromollusks.

Contents

Truncatella is the type genus of the family Truncatellidae.

Distribution and habitat

This genus occurs in tropical and subtropical areas. The various species of Truncatella are pantropical in distribution, with a few exceptions such as Truncatella truncatula and Truncatella subcylindrica.

Most of the species in this genus live in a habitat that is neither fully terrestrial nor fully marine: they live under plant debris near high tide level, where they are occasionally wetted with seawater by waves. A small minority of the species are fully terrestrial.

These small snails are typically found associated with drifts of plant material, where their eggs are deposited.

The adaptations of these land snails to the terrestrial environment are not so perfect as they are in the more usual pulmonate land snails, and their terrestrial adaptations may in fact be comparatively recent.

Species

The genus Truncatella was erected by Antoine Risso (Risso, 1826) for T. costulata (now T. subcylindrica), which is the type species for this genus.

There are several genera within the Truncatellidae, but the eponymous genus Truncatella is the largest (in terms of number of species); other genera in the family are Geomelania, Taheitia, and Blandiella.

There are approximately 30 species in the genus Truncatella, including:

  • Truncatella avenacea Garrett, 1887
  • Truncatella bahamensis Pfeiffer, 1856
  • Truncatella bairdiana C. B. Adams, 1852
  • Truncatella brazieri Cox, 1868
  • Truncatella californica Pfeiffer, 1857 - California truncatella
  • Truncatella caribaeensis Reeve, 1842 - Caribbean truncatella
  • Truncatella ceylanica Pfeiffer, 1857
  • Truncatella clathrus Lowe, 1832
  • Truncatella diaphana Gassies, 1869
  • Truncatella ferruginea (Cox, 1868)
  • Truncatella granum Garrett, 1872
  • Truncatella guerinii Villa & Villa, 1841
  • Truncatella kiusiuensis Pilsbry, 1902
  • Truncatella marginata Küster, 1855
  • Truncatella obscura Morelet, 1882
  • Truncatella pellucida Dohrn, 1860
  • Truncatella pfeifferi Martens, 1860
  • Truncatella pulchella Pfeiffer, 1839 - beautiful truncatella - synonyms: Truncatella bilabiata, Truncatella bilabiata bilabiata, Truncatella bilabiata barbadensis.
  • Truncatella quadrasi Möllendorff, 1893
  • Truncatella rostrata Gould, 1848
  • Truncatella rustica Mousson, 1865
  • Truncatella scalarina Cox, 1867
  • Truncatella scalaris (Michaud, 1830) - ladder truncatella
  • Truncatella stimpsonii Stearns, 1872
  • Truncatella subcylindrica (Linnaeus, 1767)
  • Truncatella teres (Pfeiffer, 1857)
  • Truncatella thaanumi Clench & Turner, 1948
  • Truncatella truncatula
  • Truncatella vincentiana Cotton, 1942
  • Truncatella yorkensis (Cox, 1868)
  • Description

    As implied by the name, these snails are notable for the way they modify their elongated shells as they mature, breaking off several of the apical whorls, and forming a relatively smooth seal for the remainder of the shell.

    Locomotion

    The method of locomotion used by Truncatella is unusual. Instead of gliding over a slime trail using minute waves in its foot, Truncatella uses a very large and muscular proboscis to reach ahead and grasp a surface, at which point the small foot releases its hold and the proboscis contracts to pull the animal forward, after which the entire procedure is usually repeated.

    References

    Truncatella (gastropod) Wikipedia