Milacidae is a family

Family

In human context, a family is a group of people affiliated by consanguinity, affinity, or co-residence. In most societies it is the principal institution for the socialization of children...

 of air-breathing, keel

Keel

In boats and ships, keel can refer to either of two parts: a structural element, or a hydrodynamic element. These parts overlap. As the laying down of the keel is the initial step in construction of a ship, in British and American shipbuilding traditions the construction is dated from this event...

ed, land slug

Slug

Slug is a common name that is normally applied to any gastropod mollusc that lacks a shell, has a very reduced shell, or has a small internal shell...

s. These are shell-less terrestrial

Terrestrial animal

Terrestrial animals are animals that live predominantly or entirely on land , as compared with aquatic animals, which live predominantly or entirely in the water , or amphibians, which rely on a combination of aquatic and terrestrial habitats...

 gastropod mollusks in the superfamily Parmacelloidea

Parmacelloidea

Parmacelloidea is a superfamily of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the clade Stylommatophora and the informal group Pulmonata...

.

This family has no subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005

Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)

The taxonomy of the Gastropoda as it was revised by Philippe Bouchet and Jean-Pierre Rocroi is currently the most up-to-date overall system for classifying gastropod mollusks...

).

Anatomy

In this family, the number of haploid chromosome

Chromosome

A chromosome is an organized structure of DNA and protein found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA-bound proteins, which serve to package the DNA and control its functions.Chromosomes...

s lies between 31 and 35 (according to the values in this table).

Genera

Genera within the family Milacidae include:

• Milax Gray, 1855 - type genus
• Tandonia
  Tandonia
  Tandonia is a genus of air-breathing, keeled, land slugs. These are shell-less terrestrial gastropod mollusks in the family Milacidae.- Distribution :Distribution of genus Tandonia include Europe to north Africa and Asia Minor...
  
  Lessona & Pollonera, 1882

Cladogram

The following cladogram

Cladogram

A cladogram is a diagram used in cladistics which shows ancestral relations between organisms, to represent the evolutionary tree of life. Although traditionally such cladograms were generated largely on the basis of morphological characters, DNA and RNA sequencing data and computational...

 shows the phylogenic relationships of this family to the other families in the limacoid clade

Limacoid clade

The limacoid clade is a taxonomic clade of air-breathing land snails, semislugs and slugs, terrestrial pulmonate gastropod molluscs in the informal group Sigmurethra.- Distribution :...

:

Further reading

• Schileyko A. A. (2003). "Treatise on recent terrestrial pulmonate mollusks. 10. Ariophantidae, Ostracolethaidae, Ryssotidae, Milacidae, Dyakiidae, Staffordiidae, Gastrodontidae, Zonitidae, Daudebardiidae, Parmacellidae". Ruthenica, Supplement 2. 1309-1466.
• Wiktor A. (1987). "Milacidae (Gastropoda, Pulmonata) — systematic monograph". Annales Zoologici, Warszawa 41: 153-319.