Pyramidula pusilla

Pyramidula pusilla is a species of very small air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Pyramidulidae.^[2]

Pyramidula pusilla
Shell of Pyramidula pusilla (specimen at MNHN, Paris)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Pyramidulidae
Genus:	Pyramidula
Species:	P. pusilla
Binomial name
Pyramidula pusilla (Vallot, 1801)[1]
Synonyms
Helix pusilla Vallot, 1801 · unaccepted (original combination) Helix spirula A. Villa & J. B. Villa, 1841 · unaccepted (junior synonym) Helix umbilicata Montagu, 1803 · unaccepted (original name) Pyramidula umbilicata (Montagu, 1803) · unaccepted > junior subjective synonym

Shell description

The width of the shell is up to 2.95 mm, the height is up to 2.25 mm.^[3] The shell has a low conical shape, broader than high. It is and tightly coiled. The apical whorls regularly increase. The umbilicus is 1/4 of the diameter (in some Spain localities 1/3). The growth lines are fine and narrow, sometimes weak. The colour is red brown becoming more grey with age.

Distribution

The geographical distribution of this species is mainly Mediterranean: western and central Europe,^[3] southeastern Europe,^[4] Caucasus,^[4] Central Asia^[4] and probably the Russian Far East.^[4]

Europe (not a complete list):

• • Great Britain^[5]
  • Ireland^[5]
  • Spain^[6]
  • Portugal^[6]
  • France^[5] - in Pyrenees^[6]
  • Belgium^[5]
  • Luxembourg^[5]
  • Liechtenstein^[5]
  • Germany^[5]
  • Austria^[5]
  • Hungary^[5]
  • Bulgaria^[7]
  • Czech Republic^[5][8]
  • Slovakia^[5][9]
  • Poland^[4][5]
  • Ukraine - in Carpathians, Podolian Upland and Crimean Mountains^[4]

Southwestern Asia (not a complete list):

• • Russia - in Caucasus^[4]
  • Georgia^[4]
  • Armenia^[4]
  • Azerbaijan^[4]
  • Israel^[10]

Central Asia:

• • Kazakhstan^[4]
  • Uzbekistan^[4]
  • Turkmenistan^[4]
  • Tajikistan^[4]