''Tandonia'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of air-breathing,

keel The keel is the bottom-most longitudinal structural element on a vessel. On some sailboats, it may have a hydrodynamic and counterbalancing purpose, as well. As the laying down of the keel is the initial step in the construction of a ship, in Br ...

ed, land

slug Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc. The word ''slug'' is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a smal ...

s. These are shell-less

terrestrial Terrestrial refers to things related to land or the planet Earth. Terrestrial may also refer to: * Terrestrial animal, an animal that lives on land opposed to living in water, or sometimes an animal that lives on or near the ground, as opposed to ...

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

s in the family

Milacidae Milacidae is a family of air-breathing, keeled, land slugs. These are shell-less terrestrial gastropod mollusks in the superfamily Parmacelloidea. This family has no subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocro ...

Distribution

The distribution of the genus ''Tandonia'' includes Europe to North Africa and Asia Minor. The largest number of species are in the southern

Alps The Alps () ; german: Alpen ; it, Alpi ; rm, Alps ; sl, Alpe . are the highest and most extensive mountain range system that lies entirely in Europe, stretching approximately across seven Alpine countries (from west to east): France, Sw ...

Description

The slug's body is elongate, up to 100 mm in length, and usually with almost parallel sides. The posterior par is abruptly narrowed, the keel usually low and is restricted to the last section of the dorsum in some species, reaching the mantle margin in others.

Reproductive system The reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction. Many non-living substances such as fluids, hormones, and pheromones are als ...

: The penis is usually short, the

epiphallus The reproductive system of gastropods (slugs and snails) varies greatly from one group to another within this very large and diverse taxonomic class of animals. Their reproductive strategies also vary greatly, see Mating of gastropods. In many mar ...

is long. The retractor penis inserts at the boundary between the penis and epiphallus. The vas deferens of specific length opens into the posterior end of the epiphallus. The vaginal accessory glands (usually more than one) are of specific shapes, and are connected by ducts to the vagina or to the point where the vagina enters the atrium. The atrium is small and tubular, with no stimulator inside.

Spermatheca The spermatheca (pronounced plural: spermathecae ), also called receptaculum seminis (plural: receptacula seminis), is an organ of the female reproductive tract in insects, e.g. ants, bees, some molluscs, oligochaeta worms and certain other ...

are of specific size, the spermathecal duct can be longer or shorter than the spermatheca.

Species

Within the genus ''Tandonia'' there are the following 29 species:"Species in genus ''Tandonia''"
=29

AnimalBase AnimalBase is a project brought to life in 2004 and is maintained by the University of Göttingen, Germany. The goal of the AnimalBase project is to digitize early zoological literature, provide copyright-free open access to zoological works, and pr ...

, accessed 26 August 2010. * '' Tandonia albanica'' (Soós, 1924) * '' Tandonia baldensis'' (Simroth, 1910) * '' Tandonia bosnensis'' Wiktor, 1986 * ''

Tandonia budapestensis ''Tandonia budapestensis'' is a species of air-breathing, keeled, land slug, a shell-less terrestrial gastropod mollusks in the family Milacidae.Marshall, B. (2014). Tandonia budapestensis (Hazay, 1880). Accessed through: World Register of Marin ...

'' (Hazay, 1880) * '' Tandonia cavicola'' (Simroth, 1916) * '' Tandonia cretica'' (Simroth, 1885) * '' Tandonia cristata'' (Kaleniczenko, 1851) * '' Tandonia croatica'' (Wagner, 1929) * '' Tandonia dalmatina'' (Simroth, 1900) * '' Tandonia ehrmanni'' (Simroth, 1910) * '' Tandonia fejervaryi'' (Wagner, 1929) * '' Tandonia jablanacensis'' (Wagner, 1930) * '' Tandonia kusceri'' (Wagner, 1931) * '' Tandonia lagostana'' (Wagner, 1940) * '' Tandonia macedonica'' (Rähle, 1974) * '' Tandonia melanica'' Wiktor, 1986 * ''

Tandonia nigra ''Tandonia nigra'' is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Milacidae. Distribution This slug species is endemic to north Italy and south Switzerland: Monte Generoso and Baraghetto ...

'' (Pfeiffer, 1894) * '' Tandonia pageti'' (Forcart, 1972) * '' Tandonia pinteri'' (Wiktor, 1975) * '' Tandonia piriniana'' Wiktor, 1983 * '' Tandonia rara'' Wiktor, 1996 * '' Tandonia retowskii'' (Böttger, 1882) * '' Tandonia reuleauxi'' (Clessin, 1887) * '' Tandonia robici'' (Simroth, 1885) * '' Tandonia rustica'' (Millet, 1843) - type species * '' Tandonia samsunensis'' (Forcart, 1942) * '' Tandonia serbica'' (Wagner, 1931) * '' Tandonia sowerbyi'' (Férussac, 1823) * '' Tandonia totevi'' (Wiktor, 1975)

References

This article incorporates public domain text from the reference.

"Genus summary for ''Tandonia''"

, last modified 23 May 2010, accessed 26 August 2010. {{Taxonbar, from=Q147313 Milacidae Taxonomy articles created by Polbot