Metalycaeus muciferus (Heude, 1885) Fig. 33

Alycoeus [sic] muciferus Heude, 1885: 96, pl. 24, figs 1, 1a.

Alycaeus (Orthalycaeus) muciferus - Möllendorff 1886: 171.

Alycaeus helicodes Gredler, 1888: 365.

Alycaeus expansus Heude, 1890: 129, pl. 38, fig. 2. syn. nov.

Alycaeus (Chamalycaeus) muciferus - Kobelt and Möllendorff 1897: 149; Kobelt 1902: 359.

Metalycaeus muciferus - Páll-Gergely et al. 2017: 88-93, figs 58, 59, 60, 61 ( helicodes Gredler is a synonym).

" Chamalycaeus " expansus - Páll-Gergely et al. 2017: 105, fig. 69L.

Type locality.

"in ditione Tchen-k’eou” ( Alycoeus muciferus ); Pe-shang, Prov. Hunan ( A. helicodes ); "Tchen K’eou” ( A. expansus ).

Material examined.

China, Tchen-k’eou , MCZ 167230 (7 syntypes of A. muciferus ); Tchen-k’eou , China, Pe-shang, Hunan, leg. Fuchs, coll. Gredler, SMF 192225 (2 paralectotypes of A. helicodes , lectotype in the Franziskanergymnasium Bozen [Bolzano, Italy], designated by Zilch 1974); HMT-215a, syntype: labelled as lectotype of A. expansus deposited in IZCAS: Tchen-k’eou (Cheng-kou County, Chong-qing, China) (Fig. 33).

Remarks.

Protoconch conspicuously elevated from dorsal surface, its end with inconspicuous spiral striations; R1 with irregular, widely spaced ribs and fine spiral sculpture; R2 with dense, sharp, elevated ribs.

No type specimens of Alycaeus expansus were reported in American museums (Johnson 1973). We were not able to examine the types deposited in the Beijing Museum before the revision of Chinese Alycaeidae ( Páll-Gergely et al. 2017), but could do so now. The general shell shape, colour, sculpture, and the lengths and proportions of R2 and R3 agree with those of A. muciferus , which was described from the same type locality. Consequently, we move Alycaeus expansus to the synonymy of A. muciferus .