Amplirhagada kimberleyana, Köhler, 2010

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 : 268-269

Amplirhagada kimberleyana n.sp.

Type locality ( Fig. 1 ). Western Australia, Kimberley, Bonaparte Archipelago, Camden Sound , northern Slate Islands , 2.4 km NW of Wilson Point, 15°32'10"S 124°23'56"E; KC-005 (leg. V. Kessner & A. Longbottom, 09 July 1988) .

Type material. Holotype WAM S34625 (Pl. 2.13) . Paratypes AMS C463760 (5 preserved specimens), FMNH 219055 (21 preserved specimens), WAM S41480 (15 preserved specimens) .

Etymology. In reference to the Kimberley region.

Shell ( Fig. 79A–D , Pl. 2.13). Semi-globose to broadly conical, with medium high spire; thin to solid (translucent). Periphery evenly rounded to slightly angulate; upper sector of whorl and basal sector rounded. Umbilicus forming a chink to narrowly winding opening, 60–100 percent concealed by columellar reflection. Background colour beige-brown; subsutural band absent or diffuse, brown; mid-whorl band absent or diffuse, brown, thin, visible on last whorl only; ventral colour lighter, horn or whitish; outer lip colour differs from shell, light brown to whitish; inner lip whitish. Protoconch c. 3 mm in diameter, comprising 2 whorls, smooth. Teleoconch smooth except of axial growth lines. Angle of aperture 45°; outer lip rounded, moderately thick, slightly expanded, not or slightly reflected, basal and palatal node absent. Parietal wall of inner lip inconspicuous.

Pallial morphology. Pallial cavity moderately deep, extending 3 ⁄ 4 whorl. Pigmentation on mantle mottled, black. Kidney extending about half of pallial cavity.

Genital morphology ( Figs. 80–81 ). Penis straight, more or less of same length as anterior part of oviduct or longer. Vas deferens coils once before entering penis. Penial retractor muscle shorter than penis. Penial verge moderately long (1 ⁄ 8 – 1 ⁄ 4 penial chamber), slender to spatulate, with pointed tip. Penial wall pustules large, arranged in rows on apical to median portion of the penial chamber. Main stimulatory pilaster undifferentiated, formed by few rows of slightly enlarged, hooked pustules. Base of penial wall smooth, supporting two smooth and narrow pilasters. Vas deferens entering penial sheath in upper third. Vagina moderately long, tubular to posteriorly slightly inflated; inner vaginal wall with smooth longitudinal pilasters. Spermathecal duct wide, internally with corrugated longitudinal pilasters. Spermathecal head globular, connected with oviduct by connective tissue, internally smooth, with thin wall. Free oviduct comprising about half of anterior part of oviduct, more or less straight. Spermoviduct of same length as anterior part of oviduct. Talon embedded in albumen gland at junction with spermoviduct.

Radular morphology ( Fig. 79F–G ). Rectangular. Tooth formula C+16+3+22. With 147 rows of teeth, 31.9 rows per mm (n = 1). Central teeth with sharply pointed, triangular mesocones, shorter than base of tooth; ectocones vestigial. Lateral teeth with sharply pointed, triangular mesocones, length equal to base of tooth; ectocones small, endocones vestigial. Marginal teeth with elongate to triangular mesocones; ectocones shorter and narrower than mesocones, divided into two denticles; endocones greatly reduced.

Comparative remarks. Shell broadly conical to domeshaped but smaller than species with similar shell shape. Inner penial wall with strong developed pustulation and undifferentiated main pilaster is diagnostic. Material of the present species has been labelled as “ Amplirhagada sp. 64” by Solem.

Figures

Figure 1. Distribution of Amplirhagada species in the Kimberley region, northwestern Australia. (1) A. euroa n.sp., Adolphus Island. (2) A. solemiana n.sp., Middle Osborn Island. (3) A. indistincta n.sp., Southwest Osborn Island, Kidney Island. (4) A. combeana, Cassini Island. (5) A. mckenziei n.sp., Oliver Island. (6) A. ponderi n.sp., Kingsmill Island. (7) A. montesquieuana n.sp., Fenelon Island. (8) A. descartesana n.sp., Descartes Island. (9) A. katerana, Katers Island. (10) A. puescheli n.sp., unnamed island near Prudhoe Island. (11) A. decora n.sp., A. kessneri n.sp., Bigge Island. (12) A. berthierana n.sp., Berthier Island. (13) A. lamarckiana n.sp., Lamarck Island.(14) A. anderdonensis n.sp., unnamed island, Anderdon Islands. (15) A. tricenaria n.sp., Prince Frederick Harbour, north of Hunter River mouth. (16) A. regia n.sp., A. boongareensis n.sp., A. gibsoni n.sp., and Amplirhagada sp., Boongaree Island. (17) A. yorkensis n.sp., Coronation Island. (18) A. buffonensis n.sp., Buffon Island. (19) A. uwinsensis n.sp., Uwins Island. (20) A. sphaeroidea n.sp., St. Andrews Island. (21) A. basilica n.sp., and A. camdenensis n.sp., Augustus Island. (22) A. kimberleyana n.sp., NW of Wilson Point. (23) A. gemina n.sp., 1.5 km SE of Hall Point. (24) A. dubitabile n.sp., Steep Island. (25) A. napierana, north Napier ranges. (26) A. percita, Napier ranges. (27) A. castra, A. mitchelliana, and A. varia, Mitchell Plateau.

Figure 79. SEM photographs of Amplirhagada kimberleyana n.sp. (A–D) Shell, paratype FMNH 219055: (A) apical whorl viewed from above (scale 200 µm); (B) sculpture on first three whorls viewed from above (scale 1 mm); (C) close-up showing sculpture on penultimate whorl (scale 200 µm); (D) close-up showing surface of last whorl (scale 200 µm).(E) Jaw, paratypeAMS C463760 (scale 100 µm). (F–G) Radula, paratype AMS C463760: (F) central and lateral teeth (scale 20 µm); (G) outer lateral and inner marginal teeth (scale 20 µm).

Figure 80. Genitalia of Amplirhagada kimberleyana n.sp., paratype AMS C463760 (9 July, scale 10 mm). Compare with Fig. 3 for labelling of structures.

Figure 81. Interior of penial chamber of Amplirhagada kimberleyana n.sp., paratype AMS C463760 (9 July, scale 5 mm). Compare with Fig. 4 for labelling of structures.