Plagiodontes rocae Doering, 1881

Pizá, Julia & Cazzaniga, Néstor J., 2009, A new species of Plagiodontes from Argentina, and new data on the anatomy of four other species in the genus (Gastropoda: Orthalicidae, Odontostominae), Journal of Natural History 43 (23 - 24), pp. 1437-1471 : 1463-1465

publication ID	https://doi.org/ 10.1080/00222930902903244
persistent identifier	https://treatment.plazi.org/id/E25D87A9-2273-3514-FE2F-ADD3FE32FF26
treatment provided by	Felipe
scientific name	Plagiodontes rocae Doering, 1881
status

Treatment

Plagiodontes rocae Doering, 1881 View in CoL

The pallial complex ( Figure 19C,D View Figure 19 ), 31–33 mm long, has a noticeably dark pigmentation, mainly in the vascularized area ( Figure 22 View Figure 22 ). The triangular kidney occupies 20% of the lung length. The ureteric pore is located at a point corresponding to the inferior third of the kidney. From that point on, the secondary ureter is a ureteric groove delimited by two ridges. The pulmonary vein is conspicuous and branches in a marginal afferent vein of variable extent (it ranges from 40% to 80% of the pulmonary vein length). There is an important vascularization in the ad-rectal area and between the pulmonary vein and the marginal afferent vein. The marginal vein, adjoining the mantle collar, is not branched. The mantle collar has a spongy pallial gland and several indentations caused by the apertural lamellae and folds.

Genital anatomy and morphometric variations were already described by Pizá et al. (2006), but the inner anatomy of the penis has not been previously analysed. Figure 20C,D View Figure 20 show the general aspect of the genital system. It shows a penial papilla with an accessory lobe that is up to twice as long as the true verge ( Figure 23A–D View Figure 23 ). The shorter and wider verge has a medial slit (fissure) where the epiphallus opens. The accessory lobe is laterally attached to the penis wall; it is smooth and triangular in section. The internal sculpture of the penis is composed of longitudinal pilasters with some branches and anastomoses ( Figure 23C,D View Figure 23 ). The internal structure of the vagina is unique because it has two different areas; one of them, externally identifiable, is markedly thick, with undulated and branched folds, while the other is thin and smooth, although it may have minor longitudinal thread lines.

The bursa copulatrix duct has straight longitudinal folds as in the remaining species ( Figure 24A–D View Figure 24 ).