Photo of the day (62): Achatinidae shells

There is a small display of shells from the family Achatinidae in one of new houses called House of Evolution in the Ostrava ZOO, Czech Republic. All Achatinidae species comes from Africa, but some of them spreaded to other continents by human activities as pests and pets.

Table with shells of AchatinidaeThere are the following species on display:
Archachatina marginata marginata from Cameroon,
Limicolaria numidica from Cameroon,
Achatina achatina from Ghana,
Limicolaria flammea from Ghana,
Archachatina marginata candefacta from Cameroon,
Achatina balteata infrafusca from Congo,
Pseudachatina connectens rollei from Cameroon,
Archachatina papyracea adelinae from Cameroon,
Archachatina puylaerti from Togo,
Archachatina porphyrostoma from Nigeria,
Archachatina marginata suturalis from Nigeria.

These are just 11 samples of the diversity of Achatinidae, that contains 176 species and subspecies.
Achatinidae shellsReferences

Protiva T. 2011: Oblovky plži čeledi Achatinidae. – Robimaus, 72 pp., ISBN 9788087293225. page 6. (in Czech)

Photo of the day (61): Ena montana

Ena montana is a species of a common land snail with Central European, Alpine and Carpathian distribution. It belong to the family Enidae. It is similar to Merdigera obscura, but they differ in size. Ena montana reach shell length up to 16 mm, while Merdigera obscura can grown up to 9 mm only.

Left side view of Ena montana crawling on a calcareous rock:

Ena montanaIt is the only species of Ena occurring in Central Europe. Other Ena species live in southern Europe.

My specimen comes from Velká Fatra Mountains, Slovakia. I have taken the photo in situ on a calcareous rock in the forest. But they also inhabits humid habitats in forests in lowlands.

It feeds mainly on living algae, sometimes on dead higher plants and rarely also on lichens.

References:

Falkner G., Obrdlík P., Castella E. & Speight M. C. D. 2001: Shelled Gastropoda of Western Europe. München: Friedrich-Held-Gesellschaft, 267 pp.

Horsák M., Juřičková L. & Picka J. 2013: Měkkýši České a Slovenské republiky. Molluscs of the Czech and Slovak Republics. Kabourek, Zlín, 264 pp. (in Czech and English). page 32 and 82.