Amplirhagada katerana Solem, 1981

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 : 236-237

Amplirhagada katerana Solem, 1981

Amplirhagada katerana Solem, 1981a: 198–201 , figs. 37d, 41a, 43e–f.

Material examined. AMS C463692, WAM S36601 (preserved specimens, Bonaparte Archipelago , Montague Sound, Kater’s Island, 14°26'51.6"S 125°31'07.1"E), WAM S36878 (preserved specimens, 14°26'52"S 125°31'13"E), AMS C463695, WAM S36879 (preserved specimens, 14°26'49"S 125°31'15"E), AMS C463696, WAM S36880 (preserved specimens, 14°26'56.8"S 125°31'11.0"E) ( Fig. 1 ) .

Sealing strategy. Free sealer.

Shell ( Fig. 27A–C , Pl. 1.13). Semi-globose with medium spire; solid. Periphery evenly rounded to angulate. Umbilicus forming a chink or narrowly winding opening, 80–90 percent concealed by columellar reflection. Background colour horn; with diffuse to well marked, dark brown, moderately to very thick sub-sutural and mod-whorl bands; bands may fuse with each other concealing background colour completely; ventral colour, outer lip and inner lip horn. Protoconch c. 2.3 mm in diameter, comprising 2 whorls, sculptured by fine, indistinct axial lirae. Teleoconch smooth except for axial growth lines. Angle of aperture 30°; outer lip rounded, sharp to moderately thick, slightly expanded, not or slightly reflected, basal and palatal node absent. Parietal wall of inner lip inconspicuous.

Pallial morphology. Pallial cavity deep, comprising one whorl. Mottled pigmentation on mantle dark greyish brown. Kidney extending about half of pallial cavity.

Genital morphology ( Figs. 28–29 ). Penis straight, of about same length as anterior part of oviduct. Vas deferens forms simple loop or coils before entering penis. Penial retractor muscle shorter than penis of same length. Penial sheath evenly thick. Penial verge short (1 ⁄ 8 –¼ of penial chamber), broad, with pointed tip. Penial wall covered by small pustules, arranged in rows over entire length of inner penial wall. Main stimulatory pilaster not differentiated. Three pilasters are formed by rows of thickened pustules comprising entire length of inner penial wall. Vas deferens slightly undulated, entering penial sheath close to apical portion. Vagina elongated, tubular. Inner vaginal wall with smooth longitudinal pilasters. Spermathecal duct and head not well-differentiated; duct moderately thick, internally with smooth longitudinal pilasters; head globular to elongately inflated, internally smooth, with delicate wall; only tip of head connected with oviduct by connective tissue. Free oviduct comprising more than half of anterior part of oviduct, more or less straight. Spermoviduct slightly longer than anterior part of oviduct. Talon embedded in albumen gland close to anterior end of albumen gland.

Radular morphology ( Fig. 27E–F ). Rectangular. Tooth formula C+14–20+3–4+15–22. In aerage with 126±7.0 rows of teeth, 30.7±0.1 rows per mm (n = 2). Central teeth with bluntly pointed, triangular mesocones, shorter than base of tooth; ectocones vestigial. Lateral teeth with bluntly pointed, triangular mesocones, shorter than base of tooth; ectocones and endocones vestigial. Marginal teeth with rounded mesocones; ectocones shorter and narrower than mesocones, simple; endocones vestigial.

Comparative remarks. Shell more conical in shape and whorls more flattened in diameter than in any species listed so far. Dark brown colour of most shells with pronounced different ventral colour is very characteristic. Penial interior with three longitudinal pilasters formed by enlarged wall pustules is peculiar to this species. For comparison with other species also see Solem (1981a: 198–199).

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 27. SEM photographs of Amplirhagada katerana. (A–C) Shell, AMS C463697: (A) apical whorl viewed from above (scale 200 µm); (B) sculpture on first three whorls viewed from above (scale 200 µm); (C) close-up of the peripheral keel and sculpture on last whorl (scale 200 µm). (D) Jaw,WAM S36603 (scale 100 µm). (E–F) Radula, WAM S36603: (E) close-up of central and inner lateral teeth (scale 10 µm); (F) close-up of middle marginal teeth (scale 10 µm).

Figure 28. Genitalia of Amplirhagada kateranaAMS C463692 (27 July, scale 10 mm).Compare with Fig. 3 for labelling of structures.

Figure 29. Interior of penial chamber of Amplirhagada katerana AMS C463692 (27 July, scale 5 mm) (general overview and magnification of pustulation; drawing F.K.). Compare with Fig. 4 for labelling of structures.