Amplirhagada bendraytoni, Köhler, 2011

Köhler, Frank, 2011, Descriptions of New Species of the Diverse and Endemic Land Snail Amplirhagada Iredale, 1933 from Rainforest Patches across the Kimberley, Western Australia (Pulmonata: Camaenidae), Records of the Australian Museum 63 (2), pp. 167-202 : 191

Amplirhagada bendraytoni n.sp.

Type locality. Western Australia, NW Kimberley,York Sound, 4 km SE of Cape Brewster , S of Coronation Island, between beach and base of escarpment; 15°07'40"S 124°56'15"E ( RFS 12-3 ; coll. V. Kessner, 12 Jun 1987) ( Fig. 1 ) .

Type material. Holotype WAM S34740 (preserved specimen) (Pl. 1.13; Table 1) . Paratypes WAM S34741 (2 preserved specimens) , FMNH 220448 (3 preserved specimens) , WAM S34742 (3 dried shells) , FMNH 2200447 (5 dried shells) .

Etymology. Named in honour of my friend and neighbour Ben Drayton from Sydney.

Description

Shell (Pl. 1.13; Fig. 37 A–B ). Broadly conical to semiglobose with moderately elevated spire. Solid, not translucent. Periphery angulate; upper and basal sectors rounded. Umbilicus 50–80% concealed by columellar reflection. Background colour horn with a yellowish brown tone; spiral bands absent; outer and inner lip colour lighter than shell. Protoconch not differentiable on SEM micrograph. Teleoconch with very faint axial growth lines; evenly distributed across shell surface. Angle of aperture c. 45 degrees; outer lip moderately thick, well rounded, slightly expanded, not reflected; basal node absent. Parietal wall of inner lip absent. Average shell size 15.2±1.5 × 21.3± 1.3 mm ( Table 1).

Radular and jaw morphology ( Fig. 37 C–G ). Radular Tooth formula C + 13–18 + 4 + 18–22, with 130–140 rows of teeth (n = 2). Jaw with nine plates.

Genital morphology ( Figs 38–39 ). Penis straight, tubular, thin, as long as anterior part of oviduct. Penial sheath thick. Penial retractor half as long as penis. Penial verge tiny, with pointed tip. Inner penial wall entirely smooth, with several rather indistinct longitudinal pilasters. Main stimulatory pilaster short, at proximal half of inner penial wall, corrugated by lateral lamellae, each lamella supporting usually three little hooks that are arranged into longitudinal rows that run along the central portion of the pilaster. Vas deferens thin, entering penial sheath close to penial apex, forming an extended loop. Vagina very short, proximally inflated; inner vaginal wall and wall of bursa copulatrix with smooth longitudinal pilasters. Bursa copulatrix slightly extending base of spermoviduct. Free oviduct comprising more than half of length of anterior part of oviduct. Spermoviduct longer than anterior part of oviduct.

Aestivation strategy. Free sealer.

Remarks. Anatomical description based on dissections of two specimens. Listed by Solem (1991) as “ Amplirhagada NSP 31”. The combination of an almost entirely smooth inner penial wall with a sort main pilaster, a tiny verge and a thick penial sheath are peculiar to only this species.

Figures

Figure 1. Distribution of Amplirhagada species described in the present work. (A) A. atlantis n.sp. (B) A. carsoniana n.sp. (C) A. alicunda n.sp. (D) A. davidsoniana n.sp. (E) A. vialae n.sp. and A. discoidea n.sp. (F) A. forrestiana n.sp. (G) A. inusitata n.sp. and A. epiphallica n.sp. (H) A. lindsayae n.sp. (I) A. angustocauda n.sp. (K) A. moraniana n.sp. (L) A. gardneriana n.sp. (M) A. bendraytoni n.sp. (N) A. coffea n.sp. (P) A. carinata Solem, 1981. When species occur at more than one locality, the type locality of newly described taxa is marked with an asterisk.

Figure 37. Amplirhagada bendraytoni n.sp. SEM of shell, radula and jaw (WAM S34741). (A) Protoconch and first teleoconch whorls viewed from above. (B) Detail of first teleoconch whorls viewed from above. (C) Jaw. (D) Close-up of central and inner lateral teeth. (E) Close-up of Marginal teeth. (F) Central and inner lateral teeth viewed from above. (G) Marginal teeth viewed from above. Scale bars: A–B, 1 mm; C, 100 µm; D–E, G, 10 µm; F, 20 µm.

Figure 38. Genitalia of Amplirhagada bendraytoni n.sp. (WAM S34741). For labelling of structures see Fig. 3. Scale bar = 5 mm.

Figure 39. Penial anatomy of Amplirhagada bendraytoni n.sp. (WAM S34741).For labelling of structures see Fig.4. (A) Schematic view of the penis with the penial sheath being removed. Scale bar = 5 mm.(B) Interior anatomy of the penial wall. Scale bar = 5 mm. (C) Schematic cross-section of the main pilaster (not to scale).