# Alycaeus

Alycaeus is a genus of small land snails with a gill and an operculum, terrestrial gastropod mollusks in the family Alycaeidae.

## Description

(Original description) The operculum is horny with multiple whorls. The conical shell has a regular spire. The body whorl is distorted and compressed and significantly contracted before the aperture. The aperture is circular, with a regularly reflexed peristome.
The protoconch sculpture is smooth to obliquely striated. The diameter of the shell varies between 8 mm and 15 mm. The central tooth of the radula consists of five broad cusps with the central cusp blunt.

## Distribution

There are nine recognized species of Alycaeus in Peninsular Malaysia.

## Species

Species within the genus Alycaeus include:
* Alycaeus conformis Fulton, 1902
* Alycaeus eydouxi Venmans, 1956
* Alycaeus gibbosulus Stoliczka, 1872
* Alycaeus goliath Páll-Gergely, 2023
* Alycaeus himalayae Aravind & Páll-Gergely, 2023
* Alycaeus jousseaumei Morgan, 1885
* Alycaeus pyramidalis W. H. Benson, 1856
* Alycaeus rolfbrandti Maassen, 2006
* Alycaeus somwangi Dumrongrojwattana & Maassen, 2008

### Taxon inquirendum

* Alycaeus huberi Thach, 2018 (uncertain: debated synonym)

### Synonyms

* Alycaeus alticola Foon & Liew, 2017: synonym of Stomacosmethis kapayanensis alticola (Foon & T.-S. Liew, 2017) (basionym)
* Alycaeus altispirus Möllendorff, 1902: synonym of Stomacosmethis altispirus (Möllendorff, 1902) (unaccepted combination)
* Alycaeus balingensis Tomlin, 1948: synonym of Stomacosmethis balingensis (Tomlin, 1948) (basionym)
* Alycaeus carinata Maassen, 2006: synonym of Stomacosmethis carinatus (Maassen, 2006) (wrong gender agreement of specific epithet)
* Alycaeus charasensis Foon & Liew, 2017: synonym of Stomacosmethis kapayanensis charasensis (Foon & T.-S. Liew, 2017) (basionym)
* Alycaeus clementsi Foon & Liew, 2017: synonym of Stomacosmethis kelantanensis clementsi (Foon & T.-S. Liew, 2017) (basionym)
* Alycaeus (Dioryx) compactus Bavay & Dautzenberg, 1900: synonym of Dioryx compactus (Bavay & Dautzenberg, 1900) (original combination)
* Alycaeus costacrassa Foon & Liew, 2017: synonym of Stomacosmethis kapayanensis costacrassa (Foon & T.-S. Liew, 2017) (basionym)
* Alycaeus expansus Foon & Liew, 2017: synonym of Stomacosmethis kelantanensis expansus (Foon & T.-S. Liew, 2017) (basionym)
* Alycaeus galbanus Godwin-Austen, 1889: synonym of Stomacosmethis galbanus (Godwin-Austen, 1889) (original combination)
* Alycaeus globosus Adams, 1870: synonym of Pincerna globosus (H. Adams, 1871)
* Alycaeus hosei Godwin-Austen, 1889: synonym of Stomacosmethis hosei (Godwin-Austen, 1889)
* [lycaeus ikanensis Foon & Liew, 2017: synonym of Stomacosmethis kapayanensis ikanensis (Foon & T.-S. Liew, 2017)
* Alycaeus kapayanensis Morgan, 1885: synonym of Stomacosmethis kapayanensis (de Morgan, 1885)
* Alycaeus kelantanensis Sykes, 1902: synonym of Stomacosmethis kelantanensis (Sykes, 1902)
* Alycaeus kurauensis Foon & Liew, 2017: synonym of Stomacosmethis kapayanensis kurauensis (Foon & T.-S. Liew, 2017)
* Alycaeus liratulus Preston, 1907: synonym of Pincerna liratulus (Preston, 1907)
* Alycaeus perakensis Crosse, 1879: synonym of Stomacosmethis perakensis (Crosse, 1879)
* Alycaeus regalis Foon & Liew, 2017: synonym of Stomacosmethis regalis (Foon & T.-S. Liew, 2017)
* Alycaues roebeleni Möllendorff, 1894: synonym of Stomacosmethis roebeleni (Möllendorff, 1894)
* Alycaeus selangoriensis Foon & Liew, 2017: synonym of Stomacosmethis kapayanensis selangoriensis (Foon & T.-S. Liew, 2017)
* Alycaeus senyumensis Foon & Liew, 2017: synonym of Stomacosmethis senyumensis (Foon & T.-S. Liew, 2017)
* Alycaeus thieroti Morgan, 1885: synonym of Pincerna thieroti (de Morgan, 1885)
* Alycaeus virgogravida Foon & Liew, 2017: synonym of Stomacosmethis kapayanensis virgogravida (Foon & T.-S. Liew, 2017)