Pupilla loessica
| Pupilla loessica Temporal range:
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| Drawing of apertural view of a shell of Pupilla loessica | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Heterobranchia |
| Order: | Stylommatophora |
| Family: | Pupillidae |
| Genus: | Pupilla |
| Species: | P. loessica
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| Binomial name | |
| Pupilla loessica | |
Pupilla loessica is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Pupillidae.
Pupilla loessica is a significant glacial index species for the Pleistocene in Central and Eastern Europe and also in parts of NorthWestern Europe.[1] It lives as extant species in Central Asia.[1]
Distribution[edit]
Pupilla loessica was first described by Czech biologist Vojen Ložek in 1954 from late Pleistocene loess from Předmostí u Přerova (Moravia, Czech Republic).[1] For the Pleistocene in Central and Eastern Europe and also in parts of NorthWestern Europe, Pupilla loessica constitutes a significant glacial index species.[1]
Individual specimens had been found since the early Pleistocene.[1] It was widespread above all in the middle Pleistocene and late Pleistocene.[1]
Fossil distribution of Pupilla loessica include:
- central Europe in Pleistocene.[3] Found in loess sediments.[3]
At an early date (1986), Ložek supported the view that Pupilla loessica was alive at the present time in Central Asia.[1]
Recent distribution of Pupilla loessica include:
- Altai Mountains, Russia[1][3]
- Northern Mongolia (1670 m a.s.l.)[1]
- Baikal region (to the west of the Baikal Lake, 560 m a.s.l.), Russia[1]
- Tien Shan (3000 m a.s.l.), Kyrgyzstan[1]
Description[edit]
The shells of Pupilla loessica are about 3 mm high, thin, cylindrical-ovate and have a rounded conical apex.[1] The approximately 5 strongly curved whorls gradually increase in height and are finely and irregularly ribbed.[1] The short elliptical aperture has no denticles, no palatal callus and is only slightly broadened.[1] The crest is at most indicated by a weak band.[1]
The shells are usually a strong brown colour when fresh.[1] The fine ribs evidence very low, fragile rims which are not always visible in recent shells.[1] On weathered shells the fine ribs are still visible although less pronounced, as on the shells of the Pleistocene Pupilla loessica.[1]
The width of the recent shells is 1.6-1.8 mm.[1] The height of the shells of the recent shell is 2.5-3.3 mm.[1]
The species differs from Pupilla muscorum by its smaller size, the strongly rounded and ribbed whorls and the lack of denticles and crest.[1] The species is similar to Pupilla alpicola with similar intraspecific shell shape differences across time suggesting that similar niche shifts have led to similar transformations in parallel.[4]
Ecology[edit]
Pupilla loessica occur from woodland to dry steppe.[3] The altitude ranges from 560 m a.s.l. to high altitude habitats around 3000 m a.s.l.[1] This species prefer continental types of habitat with average annual temperatures markedly below 0 °C.[1] The climate ranges from continental to sub-boreal climate.[1] Although it is a frequent loess mollusc, it apparently lived in various glacial habitats.[1]
Pupilla loessica is found in various different habitats in the Saylyugem Mountains.[1] These habitats range from stony steppe via open woodland with Larix sibirica, shrubland, mesophilic meadows to humid high altitude meadows with Carex sp. and Dryas oxyodonta (alpine tundra).[1]
For example in Saylyugem Mountains Pupilla loessica lives in 2200–2650 m a.s.l.[1] The closest known meteorological station is the Kosh Agach Station: the average annual temperature recorded amounts to –6.7 °C (January –32 °C, July 13 °C) and the annual rainfall amounts to about 110–150 mm on average.[1]
This species often accompanies the so-called Pupilla fauna and Columella fauna (according to Ložek 1964).[5][1] In addition to Pupilla spp., species which like humidity, such as Columella columella or Vertigo genesii, are also often found together with Pupilla loessica.[1] The corresponding accompanying fauna is also adapted to the cold habitats, including e.g. Columella columella, Vertigo genesii, Vallonia tenuilabris, etc.[1] Such malacofauna in recent habitats (especially on the humid alpine meadows) correspond to those of the Pleistocene glacial habitats of the Central European region.[1]
References[edit]
This article incorporates CC-BY-3.0 text from the reference[1]
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai Meng S. & Hoffmann M. H. (2009). "Pupilla loessica Ložek 1954 (Gastropoda: Pulmonata: Pupillidae) – “A Living Fossil” in Central Asia?". Eiszeitalter und Gegenwart Quaternary Science Journal 58(1): 55–69. doi:10.3285/eg.58.1.03.
- ^ (in Czech) Ložek V. (1954). "Noví měkkýši československého pleistocénu (Neue Mollusken aus dem tschechoslowakischen Pleistozän). Vertigo pseudosubstriata sp. n., Pupilla muscorum densegyrata ssp. n. a Pupilla loessica sp. n." Anthropozoikum 3(1953): 327–342, Tab. 1.
- ^ a b c d Horsák M., Chytrý M., Pokryszko B. M., Danihelka J., Ermakov N., Hájek M., Hájková P., Kintrová K., Kočí M., Kubešová S., Lustyk P., Otýpková Z., Pelánková B. & Valachovič M. (2010). "Habitats of relict terrestrial snails in southern Siberia: lessons for the reconstruction of palaeoenvironments of full-glacial Europe". Journal of Biogeography 37(8): 1450-1462. doi:10.1111/j.1365-2699.2010.02280.x.
- ^ Haase, Martin; Meng, Stefan; Horsák, Michal (2021). "Tracking parallel adaptation of shell morphology through geological times in the land snail genus Pupilla (Gastropoda: Stylommatophora: Pupillidae)". Zoological Journal of the Linnean Society. 191 (3): 720–747. doi:10.1093/zoolinnean/zlaa057.
- ^ Ložek V. (1964). Quartärmollusken der Tschechoslowakei. – Rozpravy Ústředního ústavu geologického, Praha, 31: 374 pp.