Opisthosiphon

Opisthosiphon is a genus of land snails with an operculum, terrestrial gastropod mollusks in the family Annulariidae.

Description
The genus Opisthosiphon has been described by American malacologist William Healey Dall in 1905. Dall's type description reads as follows:

Genus nov. OPISTHOSIPHON, Dall.

Type: Chondropoma Bahamense, Sh. (Figs. 1, 2.) Bahamas.

Shell with the habit of Chondropoma dentatum, Say, but in the adult with a tubular projection behind and distinct from the outer lip and the posterior angle of the aperture, but communicating with the lumen of the whorl. operculum as in Rhytidopoma, but thinner.

Species
The following species are recognised in the genus Opisthosiphon:


 * Opisthosiphon acklinsensis Bartsch, 1946
 * Opisthosiphon aguilerianum (Arango, 1876)
 * Opisthosiphon alleni Bartsch, 1946
 * Opisthosiphon andrewsi Welch, 1929
 * Opisthosiphon androsensis Pilsbry, 1930
 * Opisthosiphon apertum de la Torre & Henderson, 1921
 * Opisthosiphon bacillum de la Torre & Bartsch, 1941
 * Opisthosiphon bahamense (L. Pfeiffer, 1865)
 * Opisthosiphon banaoense de la Torre & J. B. Henderson, 1921
 * Opisthosiphon bermudezi de la Torre & Bartsch, 1941
 * Opisthosiphon berryi W. F. Clapp, 1919
 * Opisthosiphon bioscai de la Torre & Henderson, 1921
 * Opisthosiphon caguanense de la Torre & Bartsch, 1941
 * Opisthosiphon caroli Aguayo, 1932
 * Opisthosiphon claudens de la Torre & Bartsch, 1941
 * Opisthosiphon conicus Aguayo & Sánchez Roig, 1949
 * Opisthosiphon cucullatum de la Torre & Bartsch, 1941
 * Opisthosiphon cunaguae Welch, 1929
 * Opisthosiphon detectum de la Torre & Henderson, 1921
 * Opisthosiphon deviatum de la Torre & Bartsch, 1941
 * Opisthosiphon echinatum (L. Pfeiffer, 1857)
 * Opisthosiphon evanidum de la Torre & Henderson, 1921
 * Opisthosiphon excurrens (L. Pfeiffer & Gundlach, 1860)
 * Opisthosiphon greenfieldi de la Torre & Bartsch, 1941
 * Opisthosiphon guanajaense de la Torre & Bartsch, 1941
 * Opisthosiphon insulanum de la Torre & Bartsch, 1941
 * Opisthosiphon judasense de la Torre & Henderson, 1921
 * Opisthosiphon lamellicostatum de la Torre & Henderson, 1921
 * Opisthosiphon lamellosum de la Torre & Bartsch, 1941
 * Opisthosiphon litorale de la Torre & Bartsch, 1941
 * Opisthosiphon lucayanorus Clench, 1963
 * Opisthosiphon manatiense de la Torre & Bartsch, 1941
 * Opisthosiphon maynardi Vanatta, 1920
 * Opisthosiphon mayori Bartsch, 1946
 * Opisthosiphon millsi Bartsch, 1946
 * Opisthosiphon moreletianum (Petit de la Saussaye, 1850)
 * Opisthosiphon nicholasi Bartsch, 1946
 * Opisthosiphon obtectum de la Torre & Henderson, 1921
 * Opisthosiphon obturatum de la Torre & J. B. Henderson, 1921
 * Opisthosiphon opisthocoele (de la Torre & Bartsch, 1941)
 * Opisthosiphon palmeri de la Torre & Bartsch, 1941
 * Opisthosiphon paradoxum (de la Torre & J. B. Henderson, 1921)
 * Opisthosiphon paredonense de la Torre & Henderson, 1921
 * Opisthosiphon plateroense de la Torre & Bartsch, 1941
 * Opisthosiphon plicatum de la Torre & Bartsch, 1941
 * Opisthosiphon poeyi de la Torre & Bartsch, 1941
 * Opisthosiphon prominulum de la Torre & Bartsch, 1941
 * Opisthosiphon protractum de la Torre & Henderson, 1921
 * Opisthosiphon pupoides (Morelet, 1849)
 * Opisthosiphon quesadai Aguayo, 1932
 * Opisthosiphon quinti de la Torre & Bartsch, 1941
 * Opisthosiphon sainzi Aguayo, 1934
 * Opisthosiphon salustii de la Torre & Henderson, 1921
 * Opisthosiphon sanchezi de la Torre & Bartsch, 1941
 * Opisthosiphon sculptum (L. Pfeiffer, 1857)
 * Opisthosiphon simpsoni Bartsch, 1946
 * Opisthosiphon simulans (de la Torre & Bartsch, 1941)
 * Opisthosiphon sosai de la Torre & Bartsch, 1941
 * Opisthosiphon subobtectum de la Torre & Bartsch, 1941
 * Opisthosiphon subobturatum de la Torre & J. B. Henderson, 1921
 * Opisthosiphon tersum de la Torre & Henderson, 1921
 * Opisthosiphon thesaurus Watters, 2019
 * Opisthosiphon torrei Welch, 1929
 * Opisthosiphon turiguanoense de la Torre & Bartsch, 1941