Amplirhagada inusitata, 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 : 185-186

Amplirhagada inusitata n.sp.

Type locality. Western Australia, NW Kimberley, N side of Prince Frederick Harbour , near mouth, 16 km W of Mt. Anderdon, 0.3 km from coast; 14°57'10"S 125°16'30"E ( RFS 14-1 ; coll. V. Kessner, 14 Jun 1987) ( Fig. 1 ) .

Type material. Holotype WAM S34728 (preserved specimen, dissected) . Paratypes WAM S34729 (preserved specimen, juvenile) , FMNH 220537 (preserved specimen) , AM C.472929 (2 dried shells), WAM S34730 (3 dried shells) (Pl. 1.9) , FMNH 220540 (6 dried shells) .

Etymology. Species epithet derived from “inusitata” (Latin, unusual, uncommon, extraordinary; of female gender) in reference to its remarkably distinct penial morphology.

Description

Shell (Pl. 1.9; Fig. 26 A–C ). Broadly conical with low spire. Thin, translucent. Periphery sharply angulate; upper sector of whorls flattened. Umbilicus 30–50% concealed by columellar reflection. Background colour pale yellowish brown; peripheral band diffuse to well developed, moderately broad, brown, visible on visible on last whorl only; subsutural band diffuse to well developed, brown, visible on last whorl only; outer and inner colour like shell. Protoconch 2.6 mm in diameter, comprising about one whorl, with very indistinct radially elongated pustulations. Teleoconch with faint axial growth lines, evenly distributed across shell surface. Angle of aperture 45–60 degrees; outer lip thin, well rounded, slightly expanded; basal node absent or weak. Parietal wall of inner lip inconspicuous. Average shell size 16.8±1.7 × 21.4± 0.7 mm ( Table 1).

Radular and jaw morphology ( Fig. 26 D–G ). Tooth formula C + 14–19 + 4 +?; 125 rows of teeth (n = 1). Jaw with 10 plates.

Genital morphology ( Figs 27–28 ). Penis long, curved to bending, tubular, clearly longer than anterior part of oviduct. Penial sheath very delicate. Penial retractor muscle very short. Penial verge extremely elongated, extending almost entire length of penis, with pointed tip, proximally the lumen of the penial verge forms an extended duct that is connected to vas deferens, possibly functioning as epiphallus. Penial chamber extending only distal half of entire length of penial complex, inner penial wall almost entirely smooth, in proximal third corrugated longitudinal pilasters are present consisting of fused pustules. No main stimulatory pilaster differentiated. Vas deferens rather thin, undulating, entering penial sheath close to penial apex. Vagina moderately long, tubular to slightly inflated; inner vaginal wall and wall of bursa copulatrix with smooth longitudinal pilasters. Bursa copulatrix reaching base of spermoviduct. Free oviduct long, bending, tubular, comprising more than half of length of anterior part of oviduct. Spermoviduct as long as anterior part of oviduct.

Aestivation strategy. Free sealer.

Remarks. Anatomical description based on dissection of the holotype. Listed by Solem (1991) as “ Amplirhagada NSP 26”. Shell similar to other relatively large and broadly conical species with spiral bands, such as A. combeana Iredale, 1938 and A. mitchelliana Solem, 1981 , differing from all other congeners by extremely long and tubular penial verge, narrowly elongated penis, smooth penial wall with only short corrugated pilasters at its base. Found in sympatry with A. pusilla Solem, 1981 and A. epiphallica n.sp. described below.

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 26. Amplirhagada inusitata n.sp. SEM of shell (AM C.472929), radula and jaw (WAM S34728). (A) Protoconch and first teleoconch whorls viewed from above. (B) Detail of first teleoconch whorls viewed from above. (C) Close-up of sculpture on last whorl, lateral view. (D) Jaw. (E) Central and inner lateral teeth. (F) Close-up of central and lateral teeth viewed from above. (G) Transition from outer lateral to inner marginal teeth viewed from above. Scale bars: A–B, 200 µm; C, 1 mm; E–G, 10 µm.

Figure 27. Genitalia of Amplirhagada inusitata n.sp. (WAM S34728). For labelling of structures see Fig. 3. Scale bar = 10 mm.

Figure 28. Penial anatomy of Amplirhagada inusitata n.sp. (WAM S34728). For labelling of structures see Fig. 4. Scale bar = 5 mm.