AMPLIRHAGADA ALBERTIANA SP. NOV.

FIGURES 7V, 18, 19

Type locality: Western Australia, Kimberley, Bonaparte Archipelago, Albert Island, 14°31′09.1″S, 124°55′48.4″E .

Material examined: Holotype WAM S42947 (dissected specimen) . Paratypes WAM S33000 (four preserved specimens) AM C.470992 (one preserved body) (Table 1). Additional, non-type material . FMNH 219169-70, FMNH 219670 from Albert Island (KC-043, coll. 14.vii.1988, V. Kessner) .

Etymology: For Albert Island, adjective of feminine gender.

Description: Shell (Fig. 7V) globose to broadly conical with medium high spire, thick, periphery evenly rounded (Table 3); background and ventral whitish colour crème, with brown, sub-sutural, and mid-whorl bands, shell tip may be covered in brownish suffusion; outer lip white; teleoconch with axial growth lines only. Umbilicus 50–100% concealed by columellar reflection (Table 4). Aperture simple, slightly to well expanded, slightly reflected, with weak or wanting basal node. Genital anatomy (Figs 18, 19). Penis inflated, long, coiled within penial sheath; vas deferens entering penial sheath within anterior third, penial retractor muscle moderate in length; penial verge short (<1/10 length of penial chamber), pointed; inner penial wall without main pilaster; posterior third of wall with densely packed, elongate, roundish, irregularly arranged pustules; anterior half of inner wall with irregularly shaped and arranged, corrugated, indistinct, oblique pilasters. Vagina long (about same length as penis), tubular; bursa copulatrix moderately long, tubular, extending to anterior end of spermoviduct, with inflated head.

Comparative remarks: Shell most similar to A. berthierana in shape and colour but smaller (similar to and A. turbinensis), differing from the former two species by closed instead of open umbilicus. Unlike A. intermedia, A. berthierana, and A. turbinensis penial wall not entirely covered with pustules. Typical features are coiled penis and absence of main pilaster. Bursa copulatrix conspicuously elongated (even more so than in former species). Material kept in the FMNH is labelled as ‘ Amplirhagada sp 69’.

Distribution: Albert Island only (Fig. 6).

AMPLIRHAGADA GEMINA KÖHLER, 2010

FIGURE 20A–D

Amplirhagada gemina Köhler, 2010a: 270, figs 82–84.

Type locality: Western Australia, Kimberley mainland near Camden Sound, 4.5 km north of Prior Pt, 1.5 km south of Hall Pt, 15°40′45″S, 124°22′45″E .

Material examined (Table 1): Holotype WAM S34611 (Fig. 20A) . Paratypes AM C.463754, WAM S33029 . Non-type material. WAM S42955 -7 (Fig. 20B–D).

Diagnosis: Shell (Fig. 20A–D) semi-globose to broadly conical, with moderately elevated spire; periphery evenly rounded to slightly angulate; with regular growth lines only. Umbilicus 60–100% concealed by columellar reflection (Table 4). Colour brown, base beige, lip colour whitish. Aperture simple, slightly expanded, weakly reflected, basal node absent. Genital anatomy. Penis slightly inflated, moderately long, straight; vas deferens entering penial sheath apically, penial retractor muscle moderate in length; penial verge tiny; inner penial wall entirely covered with narrowly packed, elongate, rather small pustules, no main pilaster differentiated. Vagina short (shorter than penis), inflated; bursa copulatrix moderately long, wide, extending to anterior end of spermoviduct, with weakly inflated head (Köhler, 2010a). Comparative remarks: Amplirhagada gemina and A. kimberleyana are difficult to differentiate. Their shells look almost identical, with specimens from Lulim Island being more similar to A. kimberleyana than to conspecific specimens from the mainland (Fig. 3). Main differentiating feature is slightly different penial wall sculpture: A. gemina has more crowded, smaller, undifferentiated pustules while A. kimberleyana has larger and fewer pustules, arranged in rows, some of them with hooks forming a weak main pilaster.

Distribution: South-west Kimberley coast between south of Halls Pt and Wilsons Pt, including Lulim Island, close to mainland coast (Fig. 6).

AMPLIRHAGADA KIMBERLEYANA KÖHLER, 2010

FIGURE 20E–F

Amplirhagada kimberleyana Köhler, 2010a: 268–9, figs 79–81.

Type locality: Western Australia, northern Slate Island, Camden Sound, 2 km north-west of Wilsons Pt, 15°32′10″S, 124°23′56″E .

Material examined (Table 1): Holotype WAM S34611 (Fig. 20E) . Paratypes AM C.463754, WAM S33029 . Non-type material. WAM S42955 -7 (Fig. 20F).

Taxonomic remarks: The type material was collected in 1988 on the ‘northern Slate Island’, which is identical to Wailgwin Island, named so subsequently.

Diagnosis: Shell (Fig. 20E, F) semi-globose to broadly conical, with moderately elevated spire; periphery evenly rounded to slightly angulate; with regular growth lines only. Umbilicus 60–100% concealed by columellar reflection (Table 4). Colour brown, occasionally banded, base and background colour beige, lip colour whitish. Aperture simple, slightly expanded, weakly reflected, basal node absent. Genital anatomy. Penis slightly inflated, moderately long, straight; vas deferens entering penial sheath within anterior third, penial retractor muscle moderate in length; penial verge tiny; inner penial wall entirely covered with narrowly packed, elongate, rather small pustules, main pilaster weakly differentiated, consisting of 2–3 parallel rows of inconspicuously enlarged pustules that support little hooks. Vagina short (shorter than penis), inflated; bursa copulatrix moderately long, wide, extending to anterior end of spermoviduct, with weakly inflated head (Köhler, 2010a).

Comparative remarks: Material studied here is topotypic. See above for comparison with A. gemina .

Distribution: Wailgwin Island only (Fig. 6).