Amplirhagada yorkensis, 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 : 257-259

publication ID

https://doi.org/ 10.3853/j.0067-1975.62.2010.1554

publication LSID

lsid:zoobank.org:pub:749A271A-6942-4D4C-B0DF-B968462BFF0C

persistent identifier

https://treatment.plazi.org/id/D230E916-1083-4612-B324-D355098513FD

taxon LSID

lsid:zoobank.org:act:D230E916-1083-4612-B324-D355098513FD

treatment provided by

Felipe

scientific name

Amplirhagada yorkensis
status

sp. nov.

Amplirhagada yorkensis View in CoL n.sp.

Careening Bay ; 15°06'41"S 125°01'53"E; KC-040), WAM S37376 View Materials –8 View Materials , WAM S36980 View Materials –6 View Materials , WAM S37394 View Materials –404 View Materials , AMS C463712–4 (Coronation Island, southern section) GoogleMaps .

Etymology. In reference to York Sound, where this species occurs on islands and likely adjacent mainland.

Sealing strategy. Free sealer.

Shell ( Fig. 62A–B View Figure 62 , Pl. 2.4–5). Broadly conical to almost flat with low spire; thin (translucent). Periphery evenly rounded to slightly angulate; upper and basal sectors of whorls rounded. Umbilicus open, narrowly winding, 30–90 percent concealed by columellar reflection. Background and ventral colour brownish horn; sub-sutural band absent; mid-whorl band absent or diffuse, light yellowish brown, thin, generally not very pronounced, only visible on last whorl(s); outer lip colour same as shell; inner lip translucent, whitish. Protoconch c. 2.7 mm in diameter, comprising 2 whorls, with fine, indistinct axial lirae. Teleoconch smooth except of axial growth lines. Angle of aperture 30°; outer lip rounded, sharp, expanded to largely expanded, reflected; basal and palatal node absent. Parietal wall of inner lip inconspicuous. Type locality ( Fig. 1 View Figure 1 ). Western Australia, northwestern Kimberley , Bonaparte Archipelago , York Sound , Coronation Island , southern section, 15°01'52"S 124°56'56"E; KIS- 3–085. Vine thicket on upper slopes of a volcanic hill behind mangroves, under rocks (leg. V. Kessner, 30 May 2008) GoogleMaps .

Type material. Holotype WAM S34619 View Materials (Pl. 2.4) . Paratypes AMS C463711 (24 preserved specimens), WAM S36979 View Materials (42 preserved specimens) .

Additional, non-type material. WAM S41477 View Materials , FMNH 219151 (12 preserved specimens, Port Nelson, 5 km N of Mt. Knight, c. 3 km E of

Pallial morphology. Pallial cavity moderately deep, extending 3 ⁄ 4 whorl; mantle pigmentation spotted, black. Kidney extending about half of pallial cavity.

Genital morphology ( Figs. 61 View Figure 61 , 63 View Figure 63 ). Penis curved to sharply bent, more or less of same length as anterior part of oviduct. Vas deferens coils once before entering penis. Penial retractor muscle very short, stubby. Penial verge very short, slender to spatulate, with pointed tip. Penial wall pustules of average size, arranged in rows over entire length of inner penial wall. Main stimulatory pilaster well-differentiated, large, cone-shaped, sculptured by horizontal ridges that support little hooks, comprising about 3 ⁄ 4 of length of penial chamber. Vas deferens entering penial sheath in upper third. Vagina moderately wide, posteriorly inflated; inner vaginal wall with smooth longitudinal pilasters. Spermathecal duct wide, internally with smooth longitudinal pilasters. Spermathecal head pyriform, connected with oviduct by connective tissue, internally smooth with thing wall. Free oviduct comprising about half of anterior part of oviduct, more or less straight. Spermoviduct longer than anterior part of oviduct. Talon embedded in albumen gland at junction with spermoviduct. Radular morphology ( Fig. 62D–F View Figure 62 ). Rectangular. Tooth formula C+13–14+3+18. In average with 122±1.5 rows of teeth, 32.4±2.0 rows per mm (n = 2). Central teeth with sharply pointed, triangular mesocones, shorter than base of tooth; ectocones vestigial. Lateral teeth with bluntly pointed, triangular to ovate mesocones, length equal to base of tooth; ectocones and endocones vestigial. Marginal teeth with triangular to elongate mesocones; ectocones shorter and narrower than mesocones; endocones reduced in size.

Comparative remarks. The shell is low spired with a rounded periphery and light colouration; penis with a comparatively large main pilaster. This species was referred to as “ Amplirhagada sp. 34” by Solem (1991).

WAM

Western Australian Museum

V

Royal British Columbia Museum - Herbarium

FMNH

Field Museum of Natural History

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