|
''Hyperaulax ridleyi'' is a species of tropical air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Odontostomidae.〔Breure A. S. H. & Ablett J. D. (2012) "Annotated type catalogue of the Bothriembryontidae and Odontostomidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London". ''ZooKeys'' 182: 1-70. .〕 ''Hyperaulax ridleyi'' is the type species of the genus ''Hyperaulax''.〔 This species is native to, and its occurrence is restricted to, Fernando de Noronha, an island off the coast of Brazil. The snail was described in 1890 by Edgar Albert Smith, a zoologist with the British Museum.〔 The type specimen is stored in the British Museum of Natural History.〔Breure, A. S. H . & J. R. Schouten (27 February 1985). "Notes on and descriptions of Bulimulidae (Mollusca, Gastropoda), III." ''Zoologische Verhandelingen'' Leiden 216: 1-98, figs. 1-33, pls. 1-4. ISSN 024-1652. (PDF )〕 == Shell description == The shell is umbilicated, ovate, conic above, moderately solid, brown with a buff line at the periphery, very delicately sculptured with lines of growth, and sometimes has low wrinkles and fine impressed spiral striae. The spire of the shell is conic. The apex is obtuse. The sculpture of the nepionic whorls (the whorls immediately following the embryonic whorls) has superficial vermiculate (worm-like) wrinkles. The shell has 5½ slightly convex whorls. The last whorl is a little descending and then slightly ascending in front, distinctly constricted behind the peristome. The base of the shell is perforated by a deep and conspicuous, though not wide, umbilicus.〔 The shell aperture is ovate, and is a fleshy-brown color inside. There is a pale median line in half the length of the shell. The peristome is flatly reflexed throughout. The outer lip is subangularly arcuate above, terminations joined by a thin or thick parietal callus, which is thickened and somewhat tubercular above, separated by a vertical groove or channel from a similar callous lobe on the outer lip, near its insertion.〔 The width of the shell is 6.2-7.2 mm. The height of the shell is 10.5-12.5 mm. The height of the aperture is 5.2-6.2 mm.〔 The width of the type specimen is 5.9. The height of the type specimen is 11.4.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hyperaulax ridleyi」の詳細全文を読む スポンサード リンク
|