The classification of Neohelix alleni is as follows:

Domain: Eukarya

    Kingdom: Animalia

            Phylum: Mollusca
                        Class: Gastropoda

                                    Order: Stylommatophora

                                                Family: Polygridae

                                                                Genus: Neohelix

                                                                            Species: Neohelix alleni

Eukarya: Members have cells consisting of a nucleus or nuclei containing DNA and membrane bound organelles (Hickman et al., 2012).

Animalia: Members are multicellular and heterotrophic (Animal Diversity Web, 2012).

Mollusca: The defining characteristics of the invertebrate members are a head, foot, visceral mass, mantle, along with a calcium carbonate shell (Gillis, 2012) .

Gastropoda: Members are characterized by single shell, which is usually spirally coiled.  Gastropods go through torsion, a process that results in the rotation of the visceral mass and mantle on the foot (Animal Diversity Web, 2012).

Stylommatophora: Members are terrestrial pulmonate gastropods with two pairs of tentacles which they can retract.  Its eyes are located at the top of the front pair of tentacles (Encyclopedia of Life, 2012).

Polygridae: Members are terrestrial snails, which are distinguished from other gastropods by the absence of a dart apparatus, the muscles which allows the pharynx and eyes to be withdrawn are joined by a single band, and the jaws are ribbed (Encyclopedia of Life, 2012).

Neohelix: Members are in subgenus under Triodopsis; of the triodopsine members, Neohelix group is composed of the largest snails (Emberton, 1988).

Neohelix alleni: Its common name is the Western Whitelip because of the conspicuous white lip of its shell.  Its shell is 23-28mm in diameter, 5-6 whorls, yellow to yellow-brown in color.  Neohelix alleni is distinguished by penial morphology (Emberton, 1988).  The Latin scientific name was first given by Sampson in 1883 (Discover Life, 2012). The Latin translation for "neo" is young or new.  "Helix" translates from Latin to spiral.  The name "alleni" originates from the man who last renamed the snail. 


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