Edgbastonia (Barcaldinia) cf. pallida ( Ponder & Clark, 1990 )

Zhang, - H., 2019, New taxa of Tateidae (Caenogastropoda, Truncatelloidea) from springs associated with the Great Artesian Basin and Einasleigh Uplands, Queensland, with the description of two related taxa from eastern coastal drainages, Zootaxa 4583 (1), pp. 1-67 : 39-40

Edgbastonia (Barcaldinia) cf. pallida ( Ponder & Clark, 1990)

Material examined. Queensland, Myross Station , main spring, 22° 47' 07" S, 145° 26' 05" E, edges in weed, W.F. Ponder, R. Fairfax & R. Fensham, 13 Sep 2006 , C.479947 (figured specimen); same data, C.457755, 20+; small spring, 22° 46' 32" S, 145° 26' 17" E, under two large gum trees, W.F. Ponder, R. Fairfax & R. Fensham, 17 Sep 2006 , C.458218, 10; C.478236, 2.

Shell ( Fig. 13B ). Elongately ovate, spire outline slightly convex, translucent or opaque. Length 1.4–1.9 mm (mean 1.7 mm), width 0.8–1.1 mm (mean 1.0 mm). Protoconch of about 1.3 whorls. Teleoconch whorls convex, evenly rounded, total number 3.4–4.4 (mean 3.9). Umbilicus represented by chink only. Aperture ovate, inner lip narrow, thin or medium, slightly separated along whole length of parietal wall, outer lip thin or medium. Periostracum moderately developed, white or yellow-brown or brown or reddish-brown.

Operculum ( Fig. 14B, C ). Transparent, colourless, flat. Inner side lacking white smear, simple.

Head-foot and external body. Snout, tentacles and dorsal and lateral foot unpigmented, neck and opercular lobes pigmented, mantle roof and visceral coil unpigmented to densely pigmented.

Mantle cavity. Ctenidium well-developed, filaments 18–21, broadly triangular, apex right edge. Osphradium narrowly oval, towards posterior end of ctenidium or at middle of ctenidium, length relative to gill 0.21–0.4. Hypobranchial gland moderately developed. Rectum with U-shaped bend, anus behind mantle collar. Kidney extends for about third of length into mantle cavity roof. Renal gland transverse. Pericardium extends for about third of length into mantle cavity roof, abutting posterior end of ctenidium.

Radula ( Fig. 15C, D ). Central teeth with cusp formula 3–5+1+3–4, basal cusps 2+2; median cusp long, pointed, narrow, about twice as long as adjacent cusps. Lateral teeth with cusp formula 3–4+1+4–5; main cusp pointed, narrow, curved inwards, less than twice as long as adjacent cusps. Inner marginal teeth with 16–25 cusps. Outer marginal teeth with 16–25 cusps.

Female reproductive system ( Fig. 16C, F ). Ovary simple sac. Renal oviduct with two weak undulations, anterior-most forming shallow U-shape. Seminal receptacle absent; orientated sperm in renal oviduct and/or bursal duct. Bursa copulatrix behind albumen gland, vertically-oval, shorter than albumen gland, bursal duct enters bursa mid anteriorly or antero-ventrally, bursal duct joins coiled oviduct little behind posterior mantle cavity wall or well behind posterior mantle cavity wall. Albumen gland partly in mantle cavity. Capsule gland with three distinct glandular zones, medium thickness in cross section, markedly indented by rectum. Anterior vestibule not much expanded, opening subterminal and on face of capsule gland, short, cowl and/or gutter associated with oviduct opening present.

Male reproductive system ( Fig. 17B , 18B, C ). Prostate gland less than half in mantle roof, bean-shaped, medium in cross section. Posterior pallial vas deferens coiled, anteriorly straight or slightly undulating. Penis towards middle of head, well down neck, distal part lacking lobes, terminal papilla long.

Distribution and habitat. Found in a few springs on Myross Station ( Fig. 1 ).

Remarks. This material is very similar to Ed. (B.) pallida in shell characters but differs from that taxon, and all others in this group, in its smaller, more oval bursa copulatrix and in lacking a seminal receptacle. However, because it is not well differentiated from Ed. (B.) pallida in the molecular analysis ( Fig. 31 ), and because of the considerable similarity in shell characters and allopatric distribution, it is not named. The anatomical differences could possibly be accounted for by the material not being fully sexually mature. Further investigation is required to settle the status of the Myross samples.

A discriminant function analysis of five shell measurements of the taxa in the Ed. colmani-pallida group successfully separated the species but 82% of Ed. pallida and only 72% of Ed. cf. pallida were correctly classified (Wilks’s Lambda 0.040 p<0.000) ( Fig. 20B ). In contrast, 96% and 95% respectively of Ed. colmani and Ed. hufferensis were correctly classified. An analysis including only the two forms of Ed. pallida only marginally improved the discrimination of these two taxa, with 75% correctly discriminated (Wilks’s Lambda 0.713 p=0.035).

Figures

FIGURE 1. Map of the spring supergroups associated with the Great Artesian Basin (GAB) in Queensland, showing the main non-town locations mentioned in the text (squares) and some of the towns in the area (ovals). The pale grey shading is the discharge part of the GAB, the dark grey the recharge part. The inset map of Australia shows the area illustrated. The approximate location of Conondale is indicated by a triangle and Nundle by a star. The spring supergroups are outlined with dotted lines and are as follows: A, Mulligan River; B, Springvale; C, Flinders River; D, Hughenden; E, Barcaldine (see inset at upper right for details); F, Springsure; G, Eulo.

FIGURE 13. Shells of species of Edgbastonia (Barcaldonia) n. subgen. A. Edgbastonia (B.) hufferensis n. sp., holotype (C.479951). B. Edgbastonia (B.) cf. pallida (Ponder & Clark, 1990) (C. 479947). C, D. Edgbastonia (B.) routhensis n. sp., Routh Stn, C, holotype (C.479960). D. paratype (C.448850). E, Edgbastonia (B.) pagoda n. sp., holotype, Myross Stn (C.479948). F. Edgbastonia (B.) rugosa n. sp., holotype, Myross Stn (C.479949). G. Edgbastonia (B.) corrugata umbilicata n. sp., holotype, Myross Stn (C.479946). H. Edgbastonia? conjuboyensis, holotype, Conjuboy Stn (C.479956). I. Edgbastonia (B.) chillagoensis, holotype, Chillagoe Stn (C.479958). Scale bar 1 mm.

FIGURE 14. Opercula of species of Edgbastonia (Barcaldonia) n. subgen. A. Edgbastonia (B.) hufferensis n. sp., internal view (C.423238). B, C. Edgbastonia (B.) cf. pallida (Ponder & Clark, 1990). B. External view. C. Internal view (C. 457755). D, E. Edgbastonia (B.) routhensis n. sp. D. External view. E. Internal view (C438551). F, G. Edgbastonia (B.) pagoda n. sp. F. External view. G. Internal view (C.457756). H. Edgbastonia (B.) rugosa n. sp., internal view (C.457753). I, J. Edgbastonia (B.) corrugata umbilicata n. subsp. I. External view. J. Internal view (C.415845). K, L. Edgbastonia? conjuboyensis n. sp. K. External view. L. Internal view (C.445416). M, N. Edgbastonia (B.) chillagoensis n. sp. M. External view. N. Internal view (C.438557). Scale bar 200 µm.

FIGURE 15. Radulae of species of Edgbastonia (Barcaldonia) n. subgen. A, B. Edgbastonia hufferensis n. sp. A. Part of half row showing inner marginal, lateral and central teeth. B. Lateral teeth (C.423238). C, D. Edgbastonia (B.) cf. pallida (Ponder & Clark, 1990). C. Half row. D. Lateral and marginal teeth (C.457755). E, F. Edgbastonia (B.) routhensis n. sp. E. Part of half row. F. detail of central teeth (C.438551). G–I. Edgbastonia (B.) pagoda n. sp. G. Detail of central teeth, H. Half row. I. Lateral teeth (C.457756). Scale bar 10 µm.

FIGURE 16. Female reproductive system of species of Edgbastonia (Barcaldonia) n. subgen., shown from left side. A, B. Edgbastonia (B.) hufferensis n. sp. (C.423238). C, F. Edgbastonia (B.) cf. pallida (Ponder & Clark, 1990) (C.457755). D, E. Edgbastonia (B.) routhensis n. sp. (C.438551). G, H, Edgbastonia (B.) pagoda n. sp. (C.457756). I, L. Edgbastonia (B.) rugosa n. sp. (C.457753). J, K. Edgbastonia (B.) corrugata umbilicata n. subsp., (C.415845). M, N. Edgbastonia? conjuboyensis n. sp. (C.445416). O, P. Edgbastonia (B.) chillagoensis n. sp. (C.438557). Abbreviations: ag—albumen gland; bc—bursa copulatrix; cg—capsule gland; o—opening of oviduct; pw—posterior wall of mantle cavity; ro—renal oviduct; sr—seminal receptacle; vc—ventral channel. Scale bars 200 µm.

FIGURE 17. Prostate and vas deferens of species of Edgbastonia (Barcaldonia) n. subgen. A. Edgbastonia (B.) hufferensis n. sp. (C.423238). B. Edgbastonia (B.) cf. pallida (Ponder & Clark, 1990) (C.457755). C. Edgbastonia (B.) routhensis n. sp. (C.438551). D. Edgbastonia (B.) pagoda n. sp. (C.457756). E. Edgbastonia (B.) rugosa n. sp. (C.457753). F. Edgbastonia (B.) corrugata umbilicata n. subsp. (C.415845). G. Edgbastonia? conjuboyensis n. sp. (C. 445416). H. Edgbastonia (B.) chillagoensis n. sp. (C.438557). Abbreviations: avd—anterior vas deferens; pg—prostate gland; pvd—posterior vas deferens; pw—position of posterior wall of pallial cavity. Scale bars 200 µm.

FIGURE 18. Penis and vas deferens of species of Edgbastonia (Barcaldonia) n. subgen. A. Edgbastonia (B.) hufferensis n. sp. (C.423238). B, C. Edgbastonia (B.) cf. pallida (Ponder & Clark, 1990) (C.457755). D, Edgbastonia (B.) routhensis n. sp. (C.438551). E. Edgbastonia (B.) pagoda n. sp. (C.457756). F. Edgbastonia (B.) rugosa n. sp. (C.457753). G. Edgbastonia (B.) corrugata umbilicata n. subsp. H, I. Edgbastonia? conjuboyensis n. sp. (C.445416). J, K. Edgbastonia (B.) chilagoensis n. sp. (C.438557). Abbreviations: avd—anterior vas deferens; ngl—non-glandular lobe; p—papilla; pd—penial duct. Scale bars 200 µm.

FIGURE 20. Canonical scores plot of five shell measurements of species of Edgbastonia (Barcaldonia) n. subgen. A. Members of the Ed. (B.) edgbastonensis-corrugata species-group: Ed. (B.) corrugata corrugata (x), Ed. (B.) coreena (Ǫ), Ed. (B.) edgbastonensis (+), and Ed. (B.) corrugata umbilicata (D). B. Members of the Ed. (B.) colmani-pallida species-group: Ed. (B.) colmani (x), Ed. (B.) pallida (Ǫ) and Ed. (B.) cf. pallida (+). C. Members of the Ed. (B.) jesswiseae- zeidlerorum speciesgroup: Ed. (B.) jesswiseae (x), Ed. (B.) acuminata (Ǫ), Ed. (B.) carinata (+), Ed. (B.) zeidlerorum (s) and Ed. (B.) rugosa (D). Ellipse p: 0.6827.

FIGURE 31. Phylogram of Australian tateid spring taxa and selected outgroups with Bayesian posterior probability values (shown above nodes) and RAxML bootstrap support values (shown below nodes). Posterior probability values below 0.85 and bootstrap support below 70% are not shown, and asterisks indicate optimal support. Two parallel diagonal lines on branches indicate those branches have been shortened. Bayesian tree is shown. The grey box indicates the clade encompassing all Queensland spring taxa, the monotypic Nundalia from New South Wales, and the coastal, riverine genus Jardinella from northern Queensland. All taxa included in this clade are illustrated to the right and where possible aligned with their respective placement in the phylogram. Abbreviations: C—Carnarvoncochlea; E. (B.)—Edgbastonia (Barcaldinia); E. (E.) -Edgbastonia (Edgbastonia); NQ—North Queensland (coastal); NSW—New South Wales; S—Springvalia. Names of imaged taxa are indicated, next to the illustrations, by the three first letters in their species (or subspecies) name, or, when identical, the four first letters. For details of superscript numbers 1–40, see Table 20.