Photo of the day (84): Recluzia lutea

Recluzia lutea (Bennett, 1840), synonym: Recluzia rollandiana Petit de la Saussaye, 1853, is a species of a marine pelagic snail. This means that this snail does not live on the sea bottom, but it lives in the water column. Surprisingly this snail has no swimming fins. This species does not live in the whole water column, but in its the most upper part, closer to the surface level. Therefore it is a part of neuston and such gastropods are called neustonic gastropods. Simply said: Recluzia lutea float on the sea surface. There is also the term ‘plankton’ used for these gastropods: that means it is only able to drift and it cannot swim against the water current. This species is holoplanktonic, which means that it is planktonic for its entire life. It live under a raft-like float made from air bubbles and mucus. It has not yet been observed how the float is constructed by Recluzia.

Recluzia lutea

Shells of Recluzia lutea. Photo by Rodrigo B. Salvador, CC-BY-4.0.

These shells of Recluzia lutea were found way up in the Matinhos River, Paraná state, in southern Brazil, after a storm event, and sent to the Zoology museum in São Paulo.

References

Beu A. G. 2017: Evolution of Janthina and Recluzia (Mollusca: Gastropoda: Epitoniidae). Records of the Australian Museum, 69(3): 119–222. DOI: 10.3853/j.2201-4349.69.2017.1666

S. van der Spoel, L.J. Newman & K.W. Estep (accessed December 13, 2018) Recluzia rollandiana. Marine Species Identification Portal.

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Photo of the day (83): Pleurodonte isabella

Pleurodonte isabella (Férussac, 1822) is a neotropical land snail from the family Pleurodontidae. It is also known as “Pleurodonte sp. Barbados” among snail pet keepers. It is variable in color: it can be brown, yellow, orange, blue or purple.

Pleurodonte isabellaIt is endemic to Barbados. It is widespread and abundant there. It inhabits natural environment as well as disturbed habitats. There is wet season and dry season in Barbados. Temperature ranges from 21 to 31 °C. But snails keepers recommend to keep this species in temperature 22-24 °C and in humidity 70-80 %.

It is herbivorous species. It is nuisance occasionally when it eats gingers Zingiber sp. and heliconias Heliconia sp. flowers. It was also reported as a pest on Citrus.

Various right side views:
Pleurodonte isabellaPleurodonte isabellaPleurodonte isabellaI also tested, if Pleurodonte isabella eat Canna indica ‘Auguste Ferrier’. It is cultivated variety with reddish leaves. This flower occurs in the same areas as Pleurodonte isabella, but it has molluscicidal activity. Various extracts of Canna indica kills freshwater molluscs, because it is nerve agent to them. I found that, that Pleurodonte isabella avoid eating this plant in terrarium. So it seems that they are clever enough to not poison itself.

The width of the shell of this specimen is 18 mm, the height of the shell is 13 mm.

Umbilical view:
Pleurodonte isabellaI did not identify this species by myself. I was able to get some information about ecology of Pleurodonte isabella, but I failed to get information about proper identification of the species. I am glad that an expert in Neotropical malacolofauna helped me in identification/verification.

References

Ciomperlik M. A. , Robinson D. G., Gibbs I. H. , Fields A., Stevens T. & Taylor B. M. (2013). Mortality to the Giant African Snail, Lissachatina fulica (Gastropoda: Achatinidae), and Non-Target Snails using Select Molluscicides. Florida Entomologist, 96(2): 370-379. DOI: 10.1653/024.096.0257.

Pollard G. V. & Alleyne E. H. (1986). Insect pests as constraints to the production of fruits in the Caribbean. In: Pests and Diseases as Constraints in the Production and Marketing of Fruits in the Caribbean. IICA, 31-61. page 43.

Tripathi, S. M., & Singh, D. K. (2000). Molluscicidal activity of Punica granatum bark and Canna indica root. Brazilian Journal of Medical and Biological Research, 33(11): 1351-1355. DOI: 10.1590/S0100-879X2000001100014.

Tripathi, S. M., Singh, V. K., Singh, S., & Singh, D. K. (2004). Enzyme inhibition by the molluscicidal agent Punica granatum Linn. bark and Canna indica Linn. root. Phytotherapy Research, 18(7), 501-506. DOI: 10.1002/ptr.1168.

https://pleurodonteisabella.wordpress.com/pleurodonte-isabella-in-captivity/ Accessed December 8, 2018.

https://pleurodonteisabella.wordpress.com/breeding-pleurodonte-isabella/ Accessed December 8, 2018.