Amplirhagada sp.

Köhler, Frank, 2010, Uncovering Local Endemism in the Kimberley, Western Australia: Description of New Species of the Genus Amplirhagada Iredale, 1933 (Pulmonata: Camaenidae), Records of the Australian Museum 62 (2), pp. 217-284 : 257

Amplirhagada sp.

Material studied. WAM S36953 (Pl. 2.3), AMS C463710 (shells, central section of Boongaree Island , 15°04'00"S 125°11'11"E) , WAM S36740 (2 shells, 15°04'36"S 125°11'18"E) .

Shell ( Fig. 60A–C , Pl. 2.3). Semi-globose with medium to high spire; solid. Whorls evenly rounded in cross-section. Umbilicus completely concealed by columellar reflection. Background colour brownish horn (shells worn); with well defined, chestnut brown, moderately broad sub-sutural and mid-whorl bands, most conspicuous on last whorl(s); ventral colour horn; outer lip colour lighter than shell. Protoconch c. 2.2 mm in diameter, comprising 1.7 whorls, almost smooth. Teleoconch with fine axial lirae, rounded in cross-section, regularly spaced, spaces narrower than thickness of ribs, distributed evenly across shell surface, reduced underneath suture. Angle of aperture 30°, outer lip rounded, moderately thick, expanded, slightly reflected, basal node of lip weak, palatal node absent. Parietal wall of inner lip inconspicuous.

Comparative remarks. Of this species, only five dry shells from Boongaree island are available. Although these shells differ clearly from those of all other species on this island, the limited data available are considered insufficient to justify formal description of this species. Amplirhagada regia and A. boongareensis have much larger and more dome-shaped shells. Amplirhagada gibsoni differs by having a flatter shell. Adult shells of the present species are generally higher than 14.7 mm, those of A. gibsoni are lower.

Figures

Figure 60. SEM photographs of the shell of Amplirhagada sp. AMS C463710: (A) apical whorl viewed from above (scale 1 mm); (B) sculpture on second and third whorl viewed from above (scale 1 mm); (C) close-up showing axial sculpture and keel on periphery of last whorl (scale 200 µm).