INVESTIGADORES
PIZA Julia
artículos
Título:
A new species of Plagiodontes from Argentina, and new data on the anatomy of four other species in the genus (Gastropoda: Orthalicidae, Odontostominae)
Autor/es:
PIZÁ JULIA; CAZZANIGA NÉSTOR J.
Revista:
JOURNAL OF NATURAL HISTORY
Editorial:
Taylor & Francis
Referencias:
Año: 2009 vol. 43 p. 1437 - 1471
ISSN:
0022-2933
Resumen:
Plagiodontes weyrauchi sp. n. is among the smallest species in genus Plagiodontes (Doering, 1877). Statistical multivariate analyses confirmed its distinctiveness from other species, mainly because of its high number of whorls (8–9.75), relatively small width, and low proportions of last whorl and aperture length to shell length; MDA yielded 100% of correct classification with its most similar form, P. multiplicatus parvus. Pallial and genital anatomy supports P. weyrauchi as a different species, mainly by the position of the ureteric pore, small general size of the genital system, an accessory lobe alongside the verge, and vaginal internal structure. Internal anatomy of other small-sized species in the genus was studied. Two of them have a verge with no accessory lobe, while the remaining two have an accessory lobe of different characteristics. Internal structure of the vagina also shows specific differences among Plagiodontes species; their phylogenetic significance is to be further investigated. Plagiodontes weyrauchi sp. n. is among the smallest species in genus Plagiodontes (Doering, 1877). Statistical multivariate analyses confirmed its distinctiveness from other species, mainly because of its high number of whorls (8–9.75), relatively small width, and low proportions of last whorl and aperture length to shell length; MDA yielded 100% of correct classification with its most similar form, P. multiplicatus parvus. Pallial and genital anatomy supports P. weyrauchi as a different species, mainly by the position of the ureteric pore, small general size of the genital system, an accessory lobe alongside the verge, and vaginal internal structure. Internal anatomy of other small-sized species in the genus was studied. Two of them have a verge with no accessory lobe, while the remaining two have an accessory lobe of different characteristics. Internal structure of the vagina also shows specific differences among Plagiodontes species; their phylogenetic significance is to be further investigated.