Plagiodontes dentatus (Wood, 1828)
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publication ID |
https://doi.org/ 10.1080/00222930902903244 |
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persistent identifier |
https://treatment.plazi.org/id/E25D87A9-227E-351D-FE7D-ADB9FDC5FF08 |
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treatment provided by |
Felipe |
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scientific name |
Plagiodontes dentatus (Wood, 1828) |
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Plagiodontes dentatus (Wood, 1828) View in CoL
The pallial complex ranged from 20 to 27 mm ( Figure 14A,B View Figure 14 ). It is whitish, translucent and poorly vascularized. The triangular kidney is nearly twice as long as wide and occupies 30% the length of the lung.
The ureteric pore is located slightly below the level of the midpoint of the kidney. From that point, the open secondary ureter is delimited by two ridges forming a ureteric groove ending in the pneumostome, the ad-rectal ridge being less developed than the ab-rectal one.
Variable SA LWL AML SW MA AL AW SL
DF1 −0.465 −0.414 −0.354 −0.336 0.330 −0.309 −0.219 −0.004
AL, aperture length; AML, aperture major length; AW, aperture width; LWL, length of the last whorl; MA, major angle; SA, spiral angle; SL, shell length; SW, shell width.
The pericardium is about 3.5 mm long and the pulmonary vein is 11.3–18.5 mm long. The afferent marginal vein branches out approximately from the distal third of the pulmonary vein, totalling about 50–60% of its length.
The vascularization was noticeable only from the point where the marginal afferent vein branches up to the pneumostome, both in the ad-rectal area and between the pulmonary vein and the marginal afferent vein. The marginal vein is weakly developed. The mantle collar includes a whitish spongy formation or pallial gland.
General arrangement of the genital system closely resembles other species of Plagiodontes ( Figure 15A,B View Figure 15 ); the main general differences are its smaller size and a general whitish colour.
Ovotestis composed of four to six groups of digitiform acini. The fertilization pouch–spermathecal complex conspicuous, visible in the basal portion of the albumen gland, with the free portion long and curved. The albumen gland is whitish and triangular, very variable in size ( Figure 16A,B View Figure 16 ).
The bursa copulatrix shape is variable, from spherical to ovoid ( Figure 15A,B View Figure 15 ); its duct, from 13 to 18 mm long, is distally swollen and has internal longitudinal straight folds.
The bifurcation of the vagina in the free oviduct and bursa copulatrix duct is symmetrical and has a constriction.
The vagina, shorter but wider than the penis, has internal longitudinal folds, with few signs of anastomosis, so it does not have the aspect of a reticulum ( Figure 17D,E View Figure 17 ).
The penial complex is from 17 to 21 mm long. The penis is of variable shape (subcylindrical to club-shape), from twice to three times as long as wide and slightly shorter than the epiphallus. Internally, it has a simple penial papilla or verge, very short and lacking any additional lobe; the internal tube of the verge is sculptured with anastomosed folds ( Figure 17A–C View Figure 17 ). The inner wall of the penis has longitudinal and undulated pilasters that become thin and straight in the area surrounded by the penis sheath and the genital atrium. The penis–epiphallus transition has a constriction. The epiphallus is cylindrical, with five to seven internal straight longitudinal lamellae. It has a swollen distal portion separated from the cylindrical one by a partition bearing a hollow papilla, which is formed by the junction of the straight lamellae ( Figure 17C View Figure 17 ).
The swollen area has internal undulated and anastomosed minor lamellae; it continues in a tubule running inside the penial papillae ( Figure 17C View Figure 17 ).
The flagellum is cylindrical, slightly thinner than the epiphallus, and has an internal straight longitudinal fold.
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