Photo of the day (49): Ambigolimax valentianus

Ambigolimax valentianus is a land slug from the family Limacidae. Its native distribution includes Iberian Peninsula only, but it is spreading in many other countries as an invasive species. It can live in greenhouses and similar habitats in cold areas only. It lives in greenhouses in Central Europe too. It is a pest in greenhouses and it is able to overpopulate and then it can be a serious pest. It can reach the length up to 70 mm.

Various views of the slug:

Ambigolimax valentianus

Ambigolimax valentianus

Ambigolimax valentianus

Ambigolimax valentianusThe foot is light gray:

Ambigolimax valentianusThere exist two forms of Ambigolimax valentianus: a form with two dark lateral bands and a a spotted form. The spotted form looks like this. It looks a bit yellow on the photo, but it is caused by the sunglight.

Ambigolimax valentianusIts eggs look like this. I found those eggs below the bowl for the potted plant.

Ambigolimax valentianusNotice the juvenile slug in the front. It is interesting that its egss will not survive temperatures above 33 °C.

A juvenile slug:

Ambigolimax valentianusAnother photo with juvenile slugs:

Ambigolimax valentianusThis species is also known as Lehmannia valentiana. In fact I did not known, that it could be placed in the genus Ambigolimax up today.

So I searched for reasons of its generic placement:

Klee et al. found out based on molecular phylogeny research of cytochrome-c oxidase I (COI) genes, that the genus Lehmannia is diphyletic in 2005. She also repeated the information in her thesis in 2013.

Rowson et al. confirmed such placement also according to the COI genes analysis in 2014. By the way, they did not comment this species in the PLoS article anyhow. They just shown the cladogram on the figure 5.

The results are:

Lehmannia marginata (O. F. Müller, 1774) still belong to the genus Lehmannia Heynemann, 1863, because it is the type species of the genus.

Lehmannia valentiana (Férussac, 1822) belong to the genus Ambigolimax Pollonera, 1887 as a Ambigolimax valentiana (Férussac, 1822). It is the type species of the genus Ambigolimax.

Lehmannia nyctelia (Bourguignat, 1861) also belong to the genus Ambigolimax as Ambigolimax nyctelius (Bourguignat, 1861).

There is a question, where will belong other 13 European species of Lehmannia. Especially those ones, whose reproductive system is not known.

References

Horsák M., Dvořák L. & Juřičková L. (2004) Greenhouse gastropods of the Czech Republic: current stage of research. Malacological Newsletter, 22: 141–147, page 143.

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 163.

Klee B., Falkner G. & Haszprunar G (2005). Endemic radiations of Limax (Gastropoda: Stylommatophora) slugs in Corsica – they came twice. In: Burckhardt D (ed.), 8. Jahrestagung der Gesellschaft für biologische Systematik, Basel 13.-16. September 2005, Abstracts of talks and posters: p.78. Basel (Naturhistorisches Museum). Organisms Diversity and Evolution 5, Electr. Suppl. 13: 75.

Nitz. B. (2013). Integrative systematics and biogeography of Limax (Gastropoda: Stylommatophora). Dissertation Thesis, Ludwig-Maximilians-Universität, München, 133 pp., page 105.

Rowson B., Anderson R., Turner J. & Symondson W. O. C. (2014). The slugs of Britain and Ireland: undetected and undescribed species increase a well-studied, economically important fauna by more than 20%. PLoS ONE 9(4): e91907. doi:10.1371/journal.pone.0091907

Stojnić B., Vukša M., Jokić G. & Čkrkić M. (2011). First record of introduced valencia slug, Lehmannia valentiana (Férussac, 1822), in Serbia. Pesticidi i fitomedicina, 26(3): 213–220. doi:10.2298/PIF1103213S

Udaka H., Mori M., Goto S. G. & Numata H. (2007). Seasonal reproductive cycle in relation to tolerance to high temperatures in the terrestrial slug Lehmannia valentiana. Invertebrate Biology, 126(2): 154–162.

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Surviving poisonous fungi

Amanita_phalloides

Today I was mushroom hunting. One of the best findings was the death cap Amanita phalloides, that is the most poisonous fungus of the Northern Hemisphere. It is deadly poisonous for humans, but some animals, such as gastropods can eat them without any problems.

When you are mushroom hunting, yellow slug Malacolimax tenellus is one of the most common species you can find even in spruce monoculture plantings. It is strictly woodland species living in Europe. Coniferous forests are not suitable environment for many gastropods, especially for snails. Snails can not create their shells in acidic coniferous forest habitats easily. Therefore usualy only few slug speciess thrive there.

Malacololimax_tenellus_and_amanita_phalloides_1
Malacololimax_tenellus_and_amanita_phalloides_2
Malacololimax_tenellus_and_amanita_phalloides_3
Malacololimax_tenellus_and_amanita_phalloides_4
Malacololimax_tenellus_and_amanita_phalloides_5

Although this time the slug has fallen down when trying to go up over the annulus, there are many markings how the fungus is damaged by this slug: on the top of the cap (not visible on these photos), on lamellae, on the stipe, the whole volva is eaten.

 

Gastropods are alo resistant to hallucinogenic alcaloids hyoscyamine and atropine that are available for example in mandrake plant Mandragora officinarum.

 

References:

 

(in Czech) (15 May 2011) “Peyotl, mandragora a další: Ze světa halucinogenních rostlin” Český rozhlas [Czech Radio] http://www.rozhlas.cz/planetarium/priroda/_zprava/895839 – reference about the mandrake. It would be good to have more scientific reference for the resistence to mandrake. If you know some, let me to know.

Barker G. M. (ed.) (2001) The biology of terrestrial molluscs. page 263. http://books.google.com/books?id=WlvX-9Wt0toC

 

(in Slovak) Lisický M. J. (1991). Mollusca Slovenska [The Slovak molluscs]. VEDA vydavateľstvo Slovenskej akadémie vied, Bratislava, 344 pp.