Amphidromus quadrasi

Amphidromus quadrasi
Shell of Amphidromus quadrasi quadrasi
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Camaenidae
Genus:	Amphidromus
Species:	A. quadrasi
Binomial name
Amphidromus quadrasi Hidalgo, 1887
Synonyms
see list

Amphidromus quadrasi is a species of air-breathing land snail in the family Camaenidae. ^[1]

Description

(Original description by P. Bartsch) The sinistral shell is regular and elongate-conic. Its early whorls are white. The two whorls in the protoconch appear well rounded, and are marked with numerous very fine, evenly scattered granules. The whorls in the teleoconch are appressed at the summit and smooth, exhibiting only very fine, decidedly retractive lines of growth and numerous exceedingly fine spiral striations. The sutures are only slightly constricted. The periphery of the body whorl is angulated in young shells and very feebly angulated in the adult. The base appears well rounded and is marked like the spire. The aperture is moderately large and oblique. The outer lip is reflected; the inner lip is moderately reflected. The parietal wall is glazed with a thin callus.

The coloration of typical Amphidromus quadrasi quadrasi is as follows: Early whorls are white, without a dark spot at the tip of the nucleus. The rest of the shell is yellow marked with numerous fine, decidedly retractive green lines, which tend to become fused toward the latter part of the shell, giving it a green aspect. These green lines do not quite extend to the summit. The summit is marked by a very slender yellowish-white line. This is followed by a moderately broad red band, which, in turn, is followed by a narrow yellow zone anteriorly. A red area surrounds the umbilical area, and this is followed at its posterior edge by a moderately broad yellow zone. The inside of the aperture and lip are white. ^[2]

Distribution

This species is found in Candaraman Island, Palawan Province, the Philippines.

Synonyms

• Amphidromus (Syndromus) quadrasiHidalgo, 1887 alternative representation
• Amphidromus (Syndromus) quadrasi everettiFulton, 1896 ·
• Amphidromus michaeliThach, 2021 junior subjective synonym
• Amphidromus quadrasi caxisiganensisBartsch, 1918
• Amphidromus quadrasi everettiFulton, 1896 ·
• Amphidromus quadrasi f. everettiFulton, 1896
• Amphidromus quadrasi f. palawanensisBartsch, 1917 ·
• Amphidromus quadrasi f. solidaFulton, 1896 ·
• Amphidromus quadrasi f. versicolorFulton, 1896 ·
• Amphidromus quadrasi ledyardiBartsch, 1918 ·
• Amphidromus quadrasi palawanensisBartsch, 1917 superseded rank
• Amphidromus quadrasi quadrasiHidalgo, 1887 superseded rank
• Amphidromus quadrasi solidaFulton, 1896 ·
• Amphidromus quadrasi solidusFulton, 1896 superseded rank
• Amphidromus quadrasi var. solidaFulton, 1896 ·
• Amphidromus quadrasi versicolorFulton, 1896 junior subjective synonym
• Amphidromus versicolorFulton, 1896 junior subjective synonym
• Amphidromus versicolor canabunganensisBartsch, 1919 ·
• Amphidromus versicolor demesaiBartsch, 1946
• Amphidromus versicolor higginsiBartsch, 1918
• Amphidromus versicolor monticolusBartsch, 1918
• Amphidromus versicolor secamensisBartsch, 1919 (junior synonym)
• Amphidromus versicolor weberiBartsch, 1918

References

1. Amphidromus quadrasi Hidalgo, 1887 . 22 April 2025. Retrieved through: World Register of Marine Species .
2. Bartsch, P. (1917). "The Philippine land shells of the genus Amphidromus". United States National Museum Bulletin. 100 (1): 39-40. Retrieved 22 April 2025. This article incorporates text from this source, which is in the public domain .

• Thach, N. N. (2021). New shells of South Asia and Taiwan, China, Tanzania. Seashells*Freshwater*Land snails. With 116 new species and subspecies and rejected synonyms, accepted species. 48HRBooks Company, Akron, Ohio, USA. 202 pp.
• Poppe G.T. (2020). Philippine Amphidromus. A taxonomic and nomenclatural puzzle. Visaya. Supplement 15: 86 pp.

External links

• Hidalgo, J.G. (1887). "Description d'un Amphidromus et d'un Cyclophorus nouveaux, provenant des iles Philippines". Journal de Conchyliologie. 35 (1): 36. Retrieved 22 April 2025.
• Fulton, H.C. (1896). "A list of the species of Amphidromus, Albers, with critical notes and descriptions of some hitherto undescribed species and varieties". The Annals and Magazine of Natural History. ser 6 (17): 87.
• Tryon, George W., (George Washington), - Baker, H. Burrington (Horace Burrington), - Cooke, C. Montague (Charles Montague), - Hyatt, Alpheus, - Pilsbry, Henry Augustus (1900). Manual of conchology, structural and systematic : with illustrations of the species. Second series, Pulmonata (2 ed.). Philadelphia: published by the authors. p. 229. Retrieved 15 May 2025. This article incorporates text from this source, which is in the public domain .
• Bartsch, P. (1919). "Critical remarks on Philippine Island land shells". Proceedings of the Biological Society of Washington. 32: 182.
• Bartsch, P. (1918). "The land snails of the genus Amphidromus from the islands of the Palawan Passage". Journal of the Washington Academy of Sciences. 8 (11): 382.
• Bartsch, P. (1946). "Three new subspecies of Amphidromus versicolor from the Philippine Islands". The Nautilus. 60 (2): 63.
• Möllendorff, O.F. von (1887). "Landschnecken von der Insel Bongao zwischen Sulu and Borneo". Jahrbücher der Deutschen Malakozoologischen Gesellschaft. 14: 285.
• Möllendorff, O.F. von (1898). "Verzeichnis der auf den Philippinen lebenden Landmollusken". Abhandlungen der Naturforschenden Gesellschaft zu Görlitz. 22: 149.