Uncovering Local Endemism in the Kimberley, Western Australia: Description of New Species of the Genus Amplirhagada Iredale, 1933 (Pulmonata: Camaenidae) Author Köhler, Frank text Records of the Australian Museum 2010 2010-11-24 62 2 217 284 http://dx.doi.org/10.3853/j.0067-1975.62.2010.1554 journal article 10.3853/j.0067-1975.62.2010.1554 2201-4349 5239086 749A271A-6942-4D4C-B0DF-B968462BFF0C Amplirhagada tricenaria n.sp. Type locality ( Fig. 1 ). Western Australia , Kimberley , Bonaparte Archipelago , Prince Frederick Harbour , north of Hunter River mouth, 15°01'54"S 125°23'13"E ; KC-080 (leg. V . Kessner & A. Longbottom , 22 July 1988 ) . Type material . Holotype WAM S34614 (Pl. 1.20) . Paratypes AMS C463757 (2 preserved specimens), FMNH 219322 (6 preserved specimens), WAM S41476 (4 preserved specimens) . Etymology . From tricenaria (Latin = thirty), in reference to manuscript name assigned to this species by Solem (“ Amplirhagada n.sp. 30”). Shell ( Fig. 49A–D , Pl. 1.20). Semi-globose, with medium high spire; thin to solid (translucent). Periphery slightly angulate; upper and basal sectors of whorls rounded. Umbilicus forming a chink, 90–100 percent concealed by columellar reflection. Background colour dark horn to ochre; sub-sutural and mid-whorl bands diffuse to well defined, yellowish brown, thin to moderately broad, most conspicuous on last whorls; ventral colour horn; outer lip colour same as shell; inner lip yellowish white. Protoconch c. 2.6 mm in diameter, comprising 2 whorls, almost smooth. Teleoconch with pronounced axial growth lines, last whorl almost smooth. Angle of aperture 30°, outer lip rounded, sharp to moderately thick, slightly expanded, slightly reflected, basal node of lip absent or weak, palatal node absent. Parietal wall of inner lip inconspicuous. Figure 48. Interior of penial chamber of Amplirhagada tricenaria n.sp. , paratype FMNH 219332 (22 July, scale 5 mm). Compare with Fig. 4 for labelling of structures. Figure 49. SEM photographs of Amplirhagada tricenaria n.sp. ( A–D ) Shell, paratype AMS C463757: ( A ) apical whorl viewed from above (scale 200 µm); ( B ) sculpture on second to third whorl viewed from above (scale 200 µm); ( C ) suture between last and penultimate whorl with details of sculpture (scale 100 µm); ( D ) surface of last whorl, viewed rectangularly from above (Scale 200 µm). ( E ) Jaw, paratype FMNH 219322 (scale 100 µm). ( F–G ) Radula, paratype FMNH 219332: ( F ) central and lateral teeth (scale 20 µm); ( G ) outer lateral and inner marginal teeth (scale 20 µm). Pallial morphology . Pallial cavity deep, extending one whorl. Pigmentation on mantle mottled, greyish or brownish (probably leached in actual specimens). Kidney extending about half of pallial cavity. Genital morphology ( Figs. 48 , 50 ). Penis straight, more or less of same length as anterior part of oviduct. Vas deferens forms simple loop before entering penis. Penial retractor muscle shorter than penis. Penial verge very short (barely visible), slender to spatulate with pointed tip. Penial wall pustules small, elongated, arranged in rows on apical to median portion of penial chamber. Base of inner penial walls with many smooth longitudinal pilasters. Main stimulatory pilaster well-differentiated, elongate to cone-shaped, sculptured by smooth ridges, comprising apical to median portion of penial chamber. Vas deferens entering penial sheath in upper third.Vagina of medium length and thickness, tubular, posteriorly slightly inflated. Inner vaginal wall with smooth longitudinal pilasters. Spermathecal duct moderately thick, internally with smooth longitudinal pilasters. Spermathecal head globular to elongately inflated, connected with oviduct by connective tissue, internally smooth, with thin wall. Free oviduct comprising less than half of anterior part of oviduct, more or less straight. Spermoviduct longer than anterior part of oviduct. Talon embedded in albumen gland at junction with spermoviduct. Figure 50. Genitalia of Amplirhagada tricenaria n.sp. , paratype AMS C463757 (22 July, scale 10 mm). Compare with Fig. 3 for labelling of structures. Figure 51. Genitalia of Amplirhagada regia n.sp. , paratype WAM S36647 (9 August; scale 10 mm). Compare with Fig. 3 for labelling of structures. Radular morphology ( Fig. 49F–G ). Rectangular. Tooth formula C+15–17+3+18–23. In average with 152±3.0 rows of teeth, 28.1±0.8 rows per mm (n = 2). Central teeth with sharply pointed, ovate mesocones, shorter than base of tooth; ectocones vestigial. Lateral teeth with bluntly pointed, ovate mesocones, length equal to base of tooth; ectocones small, endocones vestigial. Marginal teeth with triangular mesocones; ectocones shorter and narrower than mesocones; endocones reduced in size. Comparative remarks . This species has a very distinctive colour, similar only to A. anderdonensis , which differs by smaller shell size, less globose shell shape, higher position of peripheral angulation. Rather flattened diameter of whorls and very broadly conical shape of shell are diagnostic. Material of the present species has been labelled as “ Amplirhagada sp. 30” by Solem.