Cycloryx margarita (Theobald, 1874)

Fig. 28

Alycaeus margarita Theobald in Hanley & Theobald, 1874: 39, pl. 95 fig. 10.

Alycaeus (Cycloryx) graphiarius Godwin-Austen, 1914: 416, pl. 146 figs 7, 7a. Syn. nov.

Alycaeus margaritus – Sowerby 1877: pl. 1, species 5.

Alycaeus (Alycaeus) margarita – Kobelt 1902: 347.

Alycaeus (Cycloryx) margarita – Godwin-Austen 1914: 416.

Alycaeus margarita – Gude 1921: 211–212.

Alycaeus (Cycloryx) graphiarius – Gude 1921: 280.

Pincerna margarita – Páll-Gergely et al. 2020: 180.

Pincerna graphiaria – Páll-Gergely et al. 2020: 177.

Diagnosis

This species is characterized by a globular shell, and widely-spaced, strong ribs on the entire shell surface.

Type material examined

MYANMAR • 1 syntype of A. margarita (Fig. 28A–D); Upper Salwin; NHMUK 1888.12.4.892 • 1 syntype of A. margarita; Upper Salwin; NHMUK 1888.12.4.893 • 3 syntypes of A. graphiarius (Fig. 28E–I, mentioned as 1 syntype in Páll-Gergely et al. 2020); Shan States; Fedden leg.; Blanford coll.; NHMUK 1906.4.4.21 (two of them are A. margarita, the third shell belongs to another species, see remarks) .

Type locality

“ Shan Provinces” ( A. margarita); not specified for A. graphiarius .

Remarks

Two syntypes of A. graphiarius agreed with the original description (Godwin-Austen, 1914) by having widely-spaced ribs, but the third shell had much denser ribbing, and therefore, it clearly belongs to a different species.

The two sparsely ribbed syntypes of A. graphiarius are identical to those of A. margarita in all shell characters (size, shape, density of ribs), therefore the former is a junior synonym of the latter.