Oxychilus alliarius (Miller, 1822) mid O. helveticus (Blum, 1881), two west European species sometimes confused with each other, are redescribed. Their identification is easy, but requires both conchological mid anatomical characters. The two species arc readily distinguished by shell shape mid size and internal ornamentation of the penial complex. O. alliarius has a smaller shell (shell diameter: 4.5 - 7.0 mm) with a proportionately larger umbilicus (about 116 of shell diameter), usually lacks blackish mantle edge and has internal ornamentation of proximal penis consisting of not more than four longitudinal pleats, usually straight, sometimes slightly wavy, but never laterally branched or papillate. O. helveticus has a larger shell (shell diameter: 7.3-12.2 mm) with proportimately smaller umbilicus (about 1/8 of shell diameter), a blackish mantle edge mid internal ornamentation of proximal penis consisting of more than seven longitudinal pleats, sometimes straight and distinct, sometimes wavy, slender mid connected by lateral projections giving a reticulate appearance.
Giusti, F., Manganelli, G. (2002). Redescription of two west European Oxychilus species: O. alliarius (Miller, 1822) and O. helveticus (Blum, 1881), and notes on the systematics of Oxychilus Fitzinger, 1833 (Gastropoda: Pulmonata: Zonitidae). JOURNAL OF CONCHOLOGY, 37(Part 5), 455-476.
Redescription of two west European Oxychilus species: O. alliarius (Miller, 1822) and O. helveticus (Blum, 1881), and notes on the systematics of Oxychilus Fitzinger, 1833 (Gastropoda: Pulmonata: Zonitidae)
GIUSTI, F.;MANGANELLI, G.
2002-01-01
Abstract
Oxychilus alliarius (Miller, 1822) mid O. helveticus (Blum, 1881), two west European species sometimes confused with each other, are redescribed. Their identification is easy, but requires both conchological mid anatomical characters. The two species arc readily distinguished by shell shape mid size and internal ornamentation of the penial complex. O. alliarius has a smaller shell (shell diameter: 4.5 - 7.0 mm) with a proportionately larger umbilicus (about 116 of shell diameter), usually lacks blackish mantle edge and has internal ornamentation of proximal penis consisting of not more than four longitudinal pleats, usually straight, sometimes slightly wavy, but never laterally branched or papillate. O. helveticus has a larger shell (shell diameter: 7.3-12.2 mm) with proportimately smaller umbilicus (about 1/8 of shell diameter), a blackish mantle edge mid internal ornamentation of proximal penis consisting of more than seven longitudinal pleats, sometimes straight and distinct, sometimes wavy, slender mid connected by lateral projections giving a reticulate appearance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/11365/19005
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