Cucullarion parkini Stanisic, 1998
Material examined. Holotype. QMMO60128 (The Knoll NP, Tamborine Mtn, SE QLD, 27° 55’ S, 153° 11’ E, leg. Stanisic et al., 26/2/1985).
Non-type material. See Table S1.
Diagnosis. Shell. Medium sized, 2.8 whorls, yellow-amber, ear-shaped, flattened; base and internal whorls completely membraneous, dorsal calcified area plate-like; shell glossy, no sculpture.
Animal. Beige with reddish-brown colouring deepening on tail and neck, speckled with tiny spots of yellow pigment, faintly spotted with darker brown; sides of sole striped; tail with a strong reddish-brown keel; 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, edged with reddish brown and with reddish brown longitudinal ridges (Fig. 32A).
Gentitalia. Bursa copulatrix long, swollen at base, duct slender, sac elongate. Penis moderate size, cylindrical, completely encased in penial tunica; penis interior with one raised penial pilaster and one smaller penial pilaster, each leading up to a rounded penial pilaster proximally; both pilasters pustulose; remainder of penis interior with longitudinal ridges becoming pustulose proximally. Epiphallus short, approximately penis length, enters penis through short verge of about a quarter penis length. Epiphallic flagellum moderately long, slender, without internal cryptae; one crypt present in adjacent part of epiphallus. Spermatophore with elongate capsule and long, thin tail-pipe sculptured with a single row of tiny teeth; a single short spine present at junction of tail-pipe and capsule (Fig. 33A-B).
Remarks. Cucullarion parkini was previously known only from The Knoll NP in SE QLD. Here we extend the range to include Binna Burra in Lamington NP. This rainforest species has only ever been found a handful of times, despite relatively frequent collecting in these locations. This may be due to its highly reduced shell and slender body, which would allow it to hide deeply in the base of palm trees (individuals have been observed emerging from palm trunks during rainstorms) or other crevices. However, it is also likely that this species is present in very low numbers.
The congener of this species, Cucullarion albimaculosum, is also found in Binna Burra, although the two species have not been collected together. Cucullarion parkini can be distinguished from C. albimaculosum by its slightly smaller size and paler colour, and by the lack of white pigment on its body. Anatomically, the two species differ in the length of the flagellum and the penis interior.