Amplirhagada indistincta, 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 : 225-227

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/03F987C5-FF99-F756-0355-13904FE6C990

treatment provided by

Felipe

scientific name

Amplirhagada indistincta
status

sp. nov.

Amplirhagada indistincta View in CoL n.sp.

Type locality ( Fig. 1 View Figure 1 ). Western Australia, northwestern Kimberley, Bonaparte Archipelago, Admiralty Gulf , West coast of South West Osborn Island , 14°22'26"S 125°56'13"E; KIS 3-7. Isolated vine thicket patch on dune behind sand beach, on trees, under logs (leg. V. Kessner, 29 July 2007) GoogleMaps .

Type material. Holotype WAM S34603 View Materials (Pl. 1.5) . Paratypes AMS C463686 (5 preserved specimens, as holotype), WAM S36617 View Materials (10 preserved specimens, as holotype), AMS C463688 (5 shells, 14°22'26"S 125°56'13"E) GoogleMaps , WAM S36575 View Materials (15 shells, 14°22'26"S 125°56'13"E) GoogleMaps , AMS C463687 (20 preserved specimens, 14°22'26.5"S 125°56'17.8"E), WAM S36865 View Materials (40 preserved specimens, 14°22'26.5"S 125°56'17.8"E) GoogleMaps , AMS C463689 (11 shells, east coast, 14°22'47.3"S 125°56'00.6"E), WAM S36962 View Materials (25 shells, east coast, 14°22'47.3"S 125°56'00.6"E) GoogleMaps .

Additional, non-type material. WAM S28521 View Materials , WAM S36491 View Materials –501 About WAM , WAM S36574 View Materials , WAM S36577 View Materials , WAM S36612 View Materials –16 About WAM , WAM S36618–25 About WAM , WAM S36863 View Materials –4 About WAM , WAM S36866 View Materials , AMS C463690–1 ( South West Osborn Island ) ; WAM S41454 View Materials , AMS C463724 ( Kidney Island ; 14.329°S 125.985°E) GoogleMaps .

Etymology. From indistincta (Latin = indistinct) referring to the close morphological resemblance with A. solemiana .

Sealing strategy. Rock sealer.

Shell ( Fig. 11A–D View Figure 11 , Pl. 1.5–6). Semi-globose to broadly conical with moderate to high spire; solid to thick, not translucent. Periphery well rounded to slightly angulate. Umbilicus completely concealed by columellar reflection. Background colour yellowish to brownish white; with thin to moderately broad brown to yellowish brown sub-sutural and mid-whorls bands that are visible on most whorls, subsutural band diffuse, mid-whorl band well marked; ventral colour whitish to greyish white; outer lip colour differs from shell, whitish; inner lip translucent, white. Protoconch c. 2 mm in diameter, comprising about 1.5 whorls, with strong axial sculpture. Teleoconch sculptured by coarse, regular, curved, in cross-section rounded lirae; sculpture evenly distributed across shell and whorl diameter; spaces between lirae equal to thickness of lirae, height of lirae reduced underneath suture. Angle of aperture 30°; outer lip rounded, sharp to moderately thick, expanded, slightly reflected; basal node of lip weak, palatal node absent. Parietal wall of inner lip inconspicuous.

Pallial morphology. Pallial cavity deep, extending one whorl. Pigmentation on mantle consists of sparsely distributed dark brown to black spots. Kidney extending more than half of pallial cavity.

Genital morphology ( Figs. 9–10 View Figure 9 View Figure 10 ). Penis straight to slightly curved; same length as anterior part of oviduct or slightly longer. Vas deferens forms simple loop before entering penis. Penial retractor muscle about as long as penis. Penial verge long to very long (c. 1 ⁄ 3 to ½ of penial chamber), slender to spatulate with pointed tip. Pustulation comprising entire length of inner penial wall; penial wall pustules small to moderate in size, densely arranged in rows, some of which form four to five longitudinal pilasters along entire length of penial chamber; main stimulatory pilaster not differentiated. Vas deferens entering penial sheath apically. Vagina of medium length, tubular or posteriorly inflated. Inner vaginal wall densely ciliated, ciliae arranged to form smooth longitudinal pilasters, pilasters may be weakly developed. Spermathecal duct of medium thickness; internally with smooth longitudinal pilasters. Spermathecal head elongately inflated, connected with oviduct by connective tissue; inside entirely smooth; wall moderately thick. Length of free oviduct equivalent to about half of anterior part of oviduct; coiled underneath entrance to spermoviduct. Spermoviduct longer than anterior part of oviduct. Talon embedded in albumen gland close to anterior end.

Radular morphology ( Fig. 11F–G View Figure 11 ). Rectangular. Tooth formula C+12+3–4+20–21. Average number of rows of teeth 126±14 with 26.3±1.5 rows per mm (n = 2). Central teeth with bluntly pointed, ovate mesocones, shorter than base of tooth; ectocones vestigial. Lateral teeth with bluntly pointed, ovate mesocones, shorter than base of tooth; ectocones small, endocones absent. Marginal teeth multicuspic; ectocones shorter and narrower than mesocones, split into two denticles; endocones of approximately same size as ectocones.

Comparative remarks. Most similar to A. solemiana in shell and genital anatomy. Shells of A. indistincta are larger than those of A. solemiana ( Table 1); a one-way ANOVA revealed that both species differ significantly in the shell parameters H, D, and H/D ( Fig. 8 View Figure 8 ). Specimens from Kidney Island, which is located in between Middle and Southwest Osborn Island, tend to have slightly larger and more robust shells than specimens from the type locality. In the molecular phylogeny they cluster closely together with A. indistincta and are therefore considered conspecific because their anatomy corresponds with the specimens from Southwest Osborn Island. Amplirhagada solemiana and A. indistincta exhibit a virtually identical genital anatomy but cluster as clearly distinct lineages in the mitochondrial phylogeny (see below). For relationship with A. imitata see under A. solemiana .

V

Royal British Columbia Museum - Herbarium

WAM

Western Australian Museum

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