Haplotrema concavum are a carnivorous species of snail, so many of its adaptations are for finding and eating other animals, instead of plants. One such adaptations is that the jaw is reduced to a narrow, erescentic plate with a medium point on the cutting edge (Baker, 1930).  This narrowing of the jaw allows for it to stick its jaw into another snail's opening to try and get it out.  The radula also has a few, inverted chevron-shaped, transverse rows of teeth, which are used to scrap against an egg or another snail's shell. (Baker, 1930).  The remainder of the teeth on the inside increase in size, while the outer teeth decrease in size (Baker, 1930).  This anatomical data shows that Haplotrema is a diverging group, or quite different then snails of a similar species(Baker, 1930).  Its jaw and the central part of its radula are remnants of an ancestral species of snail with its aculeate outer teeth similar to those of the family of snail, Streptaxidae (Baker, 1930).  That shows that the Haplotrematidae and Streptaxidae share a similar ancestor and evolved separately from this ancestor. The entocones, which are similar to molars in mammals, on the inner teeth are a special feature of this species and differs from the raised entocones that are the trademark  type of teeth that are known to the pulmonates (Baker, 1930). Most species of snail have an albumen gland, which secretes a liquid over the snails' eggs, that is a single organ, but in the Haplotrema concavum this organ is split into a double organ (Baker, 1930).   Perhaps this allows the snail to cover the egg faster and more efficiently.  Also, in the various species in the group Haplotrema, the genitalia show considerable diversity (Baker, 1930). This means that different species have evolved, so that they can reproduce differently and keep their species separate from other species. In all of the snails in the genus Haplotrema there is one common characteristic, and that is the penis is created from the epiphalloid chamber rather than the vas deferens (Baker, 1930).  These many adaptations allow this species of snail to have a better chance of survival and reproduction.