Bulimus zigzag Lamarck, 1822

Breure, Abraham S. H., 2016, Annotated type catalogue of the Orthalicoidea (Mollusca, Gastropoda, Stylommatophora) in the Muséum d’histoire naturelle, Geneva, Revue suisse de Zoologie 123 (1), pp. 57-103 : 86-88

Bulimus zigzag Lamarck, 1822

Figs 131-132

Bulimus zigzag Lamarck, 1822: 118 . – Lamarck et al., 1838: 223. – Mermod, 1951: 721, fig. 74.

Type locality: “…”.

Label: No locality.

Dimensions: “Longueur, 22 lignes [H = 49 mm]”; figured specimen herein H 50.1, D 31.0, W 5+.

Type material: MHNG-INVE-51144 , two syntypes (Lamarck coll.).

Remarks: Lamarck did not mention on how many specimens his description was based; one of the shells found is subadult. Deshayes & Milne Edwards (in Lamarck et al., 1838) considered this taxon “qu’une jolie variété de la suivante, le Bulimus undatus ”. Pilsbry (1899: 136) doubtully referred this taxon to Achatina pulchella Spix, 1827 (= Orthalicus pulchellus ). Mermod (1951) suggested that one of the two specimens he found was likely not originating from the Lamark collection, as it has a “S” inscribed on it, denoting it came from the collection of L. du Sollier, Comte de la Touche. Upon checking, none of the shells in the current lot is marked with “S”. On the label of Lamarck it appears, moreover, that two shells were once glued; therefore both specimens are considered as syntypes. The smallest specimen is figured herein as it best matches the dimensions given in the original publication. When comparing the specimens to other known taxa, Mermod noticed that they were very similar to those of Orthalicus obductus Shuttleworth, 1856 (see Neubert & Gosteli 2003: 40, pl. 6 fig. 3, who illustrated one of the syntypes). Compared to their figure, the shape of the aperture is somewhat different and the last whorl of Shuttleworth’s shell seems slightly more globose, but this needs further study of the variation within these two taxa.

Current systematic position: Orthalicidae , Orthalicus zigzag (Lamarck, 1819) .

Figures

Figs 127-134. Orthalicidae. (127) Kara viriata (Morelet, 1863), syntype, MHNG-INVE-78772 (H = 58.7). (128) Kara yanamensis (Morelet, 1863), syntype, MHNG-INVE-60202 (H = 55.4). (129) Scholvienia jaspidea (Morelet, 1863), syntype, MHNG-INVE-60211 (H = 47.2). (130) Orthalicus phlogerus (d’Orbigny, 1835), syntype, MHNG-INVE-64982 (H = 47.2). (131-132) Orthalicus zigzag (Lamarck, 1822), syntype, MHNG-INVE-51144 (H = 50.1). (133-134) Liguus fasciatus (Müller, 1774), (133) paratype of Liguus fasciatus viridis Clench, 1934, MHNG-INVE-64933 (H = 55.8), (134) paratype of Liguus crenatus barbouri Clench, 1929, MHNG-INVE-64938 (H = 43.2).