Contributions to Zoology, 86 (1) – 2017Isabel T Hyman; Irantzu de la Iglesia Lamborena; Frank Köhler: Molecular phylogenetics and systematic revision of the south-eastern Australian Helicarionidae (Gastropoda, Stylommatophora)
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Cucullarion albimaculosum Stanisic, 2010

(Figs 32B, 33C-D)

Cucullarion albimaculosa Stanisic, 2010 (in Stanisic et al., 2010): 314-315, 332.

 

Material examined. Holotype. QMMO17249 (Collins Ck crossing, Border Ranges NP, N NSW, 28°26’ S, 153°09’ E, on trees, leg. Stanisic and Potter, 10/3/1987).

Non-type material. See Table S1.

 

Diagnosis. Shell. Medium sized, 3.0 whorls, amber, ear-shaped, flattened; base and internal whorls completely membraneous, dorsal calcified area plate-like; shell glossy, no sculpture (Table 3).

Animal. Orange brown with spots of thick white pigment on tail, mantle lobes and shell lappets; tail keeled; caudal horn small. Mantle lobes large, left and median lobes fused to form cephalic shield; shell lappets large, fused at both sides, covering most of shell (Fig. 32B).

Genitalia. Bursa copulatrix long, swollen at base, duct slender, sac elongated. Penis moderate size, cylindrical, completely encased in penial tunica; penis interior with diamond shaped pustules and four longitudinal pilasters at distal end. Epiphallus moderately short, approximately 1.5 times penis length, enters penis through short verge of about one fifth to one third penis length. Epiphallic flagellum very long, slender, without internal cryptae, tip attached by connective tissue to interior of left body wall; one crypt present in adjacent part of epiphallus. Spermatophore not observed (Fig. 33C-D).

Remarks. This species is found in the Border Ranges NP (NE NSW) and Lamington NP (SE QLD) (Fig. 34), from arboreal habitats in subtropical rainforest. It has been collected more frequently than C. parkini, despite its similarly cryptic nature. Cucullarion albimaculosum can be distinguished from other semislugs by the white pigment spots present on the tail, mantle lobes and shell lappets.

FIG2

Fig. 34. Occurrence records of Cucullarion, Peloparion, and Ubuiquitarion from the malacological collection of the Australian Museum, Sydney. Symbols: ● = U. iridis,  = P. helenae, + = C. albimaculosum, □ = C. parkini.