Alycaeus

Alycaeus is a genus of small land snails with a gill and an operculum, terrestrial gastropod mollusks in the family Alycaeidae. ^[1]

Alycaeus
Shell of Alycaeus goliath (holotype at MNHN, Paris)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Architaenioglossa
Superfamily:	Cyclophoroidea
Family:	Alycaeidae
Genus:	Alycaeus J. E. Gray, 1850
Type species
Cyclostoma gibbum Eydoux, 1838
Synonyms
Alcaeus [sic] misspelling - incorrect subsequent spelling Alycaeus (Alycaeus) Gray, 1850· accepted, alternate representation Alycaeus (Orthalycaeus) L. Pfeiffer, 1876 Orthalycaeus L. Pfeiffer, 1876 Alycoeus [sic] misspelling - incorrect subsequent spelling

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. ^[2]

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. ^[3]

Distribution

There are nine recognized species of Alycaeus in Peninsular Malaysia.^[4]

Species

Species within the genus Alycaeus include:

• Alycaeus conformis Fulton, 1902^[4]
• Alycaeus eydouxi Venmans, 1956
• Alycaeus gibbosulus Stoliczka, 1872^[4]
• Alycaeus goliath Páll-Gergely, 2023
• Alycaeus himalayae Aravind & Páll-Gergely, 2023
• Alycaeus jousseaumei Morgan, 1885^[4]
• 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:^[4] synonym of Stomacosmethis kapayanensis alticola (Foon & T.-S. Liew, 2017) (basionym)
• Alycaeus altispirus Möllendorff, 1902:^[4] synonym of Stomacosmethis altispirus (Möllendorff, 1902) (unaccepted combination)
• Alycaeus balingensis Tomlin, 1948:^[4] synonym of Stomacosmethis balingensis (Tomlin, 1948) (basionym)
• Alycaeus carinata Maassen, 2006:^[4] synonym of Stomacosmethis carinatus (Maassen, 2006) (wrong gender agreement of specific epithet)
• Alycaeus charasensis Foon & Liew, 2017:^[4] synonym of Stomacosmethis kapayanensis charasensis (Foon & T.-S. Liew, 2017) (basionym)
• Alycaeus clementsi Foon & Liew, 2017:^[4] 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:^[4] synonym of Stomacosmethis kapayanensis costacrassa (Foon & T.-S. Liew, 2017) (basionym)
• Alycaeus expansus Foon & Liew, 2017:^[4] 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:^[4] synonym of Stomacosmethis kapayanensis ikanensis (Foon & T.-S. Liew, 2017)
• Alycaeus kapayanensis Morgan, 1885:^[4] synonym of Stomacosmethis kapayanensis (de Morgan, 1885)
• Alycaeus kelantanensis Sykes, 1902:^[4] synonym of Stomacosmethis kelantanensis (Sykes, 1902)
• Alycaeus kurauensis Foon & Liew, 2017:^[4] synonym of Stomacosmethis kapayanensis kurauensis (Foon & T.-S. Liew, 2017)
• Alycaeus liratulus Preston, 1907:^[4] synonym of Pincerna liratulus (Preston, 1907)
• Alycaeus perakensis Crosse, 1879:^[4] synonym of Stomacosmethis perakensis (Crosse, 1879)
• Alycaeus regalis Foon & Liew, 2017:^[4] synonym of Stomacosmethis regalis (Foon & T.-S. Liew, 2017)
• Alycaues roebeleni Möllendorff, 1894:^[4] synonym of Stomacosmethis roebeleni (Möllendorff, 1894)
• Alycaeus selangoriensis Foon & Liew, 2017:^[4] synonym of Stomacosmethis kapayanensis selangoriensis (Foon & T.-S. Liew, 2017)
• Alycaeus senyumensis Foon & Liew, 2017:^[4] synonym of Stomacosmethis senyumensis (Foon & T.-S. Liew, 2017)
• Alycaeus thieroti Morgan, 1885:^[4] synonym of Pincerna thieroti (de Morgan, 1885)
• Alycaeus virgogravida Foon & Liew, 2017:^[4] synonym of Stomacosmethis kapayanensis virgogravida (Foon & T.-S. Liew, 2017)