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 <small>Fulton, 1902</small>
• Alycaeus eydouxi <small>Venmans, 1956</small>
• Alycaeus gibbosulus <small>Stoliczka, 1872</small>
• Alycaeus goliath <small>Páll-Gergely, 2023</small>
• Alycaeus himalayae <small>Aravind & Páll-Gergely, 2023</small>
• Alycaeus jousseaumei <small>Morgan, 1885</small>
• Alycaeus pyramidalis <small>W. H. Benson, 1856</small>
• Alycaeus rolfbrandti <small>Maassen, 2006</small>
• Alycaeus somwangi <small>Dumrongrojwattana & Maassen, 2008</small>

Taxon inquirendum:

• Alycaeus huberi <small>Thach, 2018</small> (uncertain: debated synonym)

Synonyms:

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

References