Trissexodontidae
# Trissexodontidae

Trissexodontidae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

This family has no subfamilies. The family Trissexodontidae was separated out from the families Hygromiidae and Helicodontidae, and some authors still classify these species within those families.

## Distribution

The distribution of Trissexodontidae includes the Iberian peninsula, northwest Africa, Azores, Canary Islands, Madeira and Cape Verde.

## Genera

Genera within the family Trissexodontidae include:

* Caracollina Beck, 1837
* Gasullia Ortiz de Zárate López, 1962
* Gasulliella Gittenberger, 1980 - with only one species, Gasulliella simplicula (Morelet, 1845)
* Gittenbergeria Schileyko, 1991
* Mastigophallus Hesse, 1918 - with only one species, Mastigophallus rangianus (Michaud, 1831)
* Oestophora Hesse, 1907
* Oestophorella Pfeffere, 1929
* Trissexodon Pilsbry, 1895 - type genus of the family Trissexodontidae
* Spirorbula Lowe, 1852 - probable classification, from Madeira and Porto Sancto
* Suboestophora Ortiz de Zárate López, 1962

## Description

Shells of species in the family Trissexodontidae are flat and regularly ribbed. The periostracum of the shell surface has no hairs.

A description of the reproductive system was summarized by Prieto et al. (1993).

In this family, the number of haploid chromosomes is known only for the genus Oestophora (n=30).

