Photo of the day (42): Bithynia transsilvanica

Bithynia transsilvanica is an eastern European freshwater snail. This species was previously known as Bithynia troschelii.

Frontal view:

Bithynia transsilvanicaIt is very similar to Bithynia leachii. But Bithynia transsilvanica is larger and it can reach up to 11 mm in shell height. The first three photos are of the same specimen and the width of the shell is 8 mm and the height of the shell is 10 mm.

Lateral view:

Bithynia transsilvanicaView of a foot:

Bithynia transsilvanicaAnother photo is of a smaller Bithynia transsilvanica snail. The width of the shell is 7 mm and the height of the shell is 9 mm. There is seen its operculum, that is slightly pointed. It is an important identification feature:

Bithynia transsilvanicaReferences

Beran L. & Horsák M. (2009) “Distribution of Bithynia leachii (Sheppard, 1823) and Bithynia troschelii (Paasch, 1842) (Gastropoda: Bithyniidae) in the Czech Republic“. Malacologica Bohemoslovaca 8: 19-23.

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). pages 29 and 43.

Photo of the day (41): veronicellid slug from Madagascar

My colleague Martin Mandák has sent me the photo of a land slug from Madagascar. Locality: Madagascar, November 2014.

veronicellid from Madagascar

a veronicellid slug, photo by Martin Mandák, CC-BY-4.0

Identification of the family was easy: slugs of the family Veronicellidae looks exactly like this. The common English name is the the leatherleaf slugs and this one really looks like a fallen leaf. But the identification of the species is usually uneasy for all of its members. I have only the photo and therefore the dissection and molecular identification methods are unavailable.

Few possibilities what it could be:

Laevicaulis alte. This species is known from Madagascar, it is an agricultural pest and some photos on the internet looks similar to this coloration pattern.

Semperula maculata. This species is also known from Madagascar, it is an agricultural pest and one photo on the internet looks similar to this coloration pattern.

Or it can be anything else.

References

Gerlach J. (1998) “The shell-less slugs of Seychelles (Veronicellidae and Urocyclidae)“. Argonauta 11(2): 56-64.

Laevicaulis alte (Férussac, 1821).” Discover Life, accessed 14 January 2015.

Photo of the day (40): Bithynia leachii

Bithynia leachii is a widespread freshwater snail in Europe and it is a least concern species. This snail can live in natural and unpolluted wetlands only. In some areas, for example in the Czech Republic, it is critically endangered, because it inhabits a very limited area there.

There is seen on this frontal view, that the shell has very convex whorls and a very deep suture. This feature distinguish it from other Bithynia species.

Bithynia leachiiThe snail on the photo has the width of the shell 4.5 mm and the height of the shell is 5.5 mm. The snail of such size is adult already.

Right side view of the same snail:

Bithynia leachiiReferences

Beran L. & Horsák M. (2009) “Distribution of Bithynia leachii (Sheppard, 1823) and Bithynia troschelii (Paasch, 1842) (Gastropoda: Bithyniidae) in the Czech Republic“. Malacologica Bohemoslovaca 8: 19-23.

Vavrová L., Cianfanelli S., Prie V., Georgiev D. & Ghamizi M. (2010). “Bithynia leachii“. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 18 January 2015.