Edgbastonia (Barcaldinia) chillagoensis, Zhang, 2019

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 : 44-45

Edgbastonia (Barcaldinia) chillagoensis n. sp.

Material examined. Holotype: Queensland, near Chillagoe, in warm spring on N side of Walsh River , 17° 03' 09" S, 144° 37' 10" E, on mud, W.F. Ponder, J.B. Studdert, C. Slatyer & J.M. Ponder, 21 Aug 2004, C.479958 . Paratypes: Same data, C.438557, 20+; QM MO85770 , 5 . Other material examined: Queensland, near Chillagoe , in warm springs on N side of Walsh River , 17° 03' 15" S, 144° 37' 06" E, temperature at outflow 41.8 °C, wetland on travertine, R.J. Fensham, 29 May 2001 , C.431067, 2; warm springs, 17° 3' 9.3234” S, 144° 37' 10.5594” E, Lana Little, Luke Parnell and Greg Larkin, 3 Aug 2014, C.483068, 20+.

Shell ( Fig. 13I ). Spire outline moderately convex, normally coiled, translucent. Length 1.5–2.1 mm (mean 1.7 mm), width 1.1–1.5 mm (mean 1.3 mm). Protoconch of about 1.1 whorls, minutely pustulate. Teleoconch whorls moderately convex, evenly rounded, total number 3.2–3.7 (mean 3.5). Umbilicus closed. Aperture ovate or pyriform, inner lip narrow, thin, moderately separated along entire length of parietal wall, outer lip thin. Periostracum moderately developed, brown.

Operculum ( Fig. 14M, N ). Transparent, colourless, flat, nucleus closer to centre than in most species of

Edgbastonia with last whorl relatively smaller. Inner side simple, lacking white smear or protuberances.

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

Mantle cavity. Ctenidium well-developed, filaments 14–20, broadly triangular, apex right edge. Osphradium narrowly oval, towards posterior end of ctenidium, length relative to gill 0.22–0.31. Hypobranchial gland thin (poorly developed). Rectum with U-shaped bend, faecal pellets longitudinally orientated, anus at or very near mantle collar or behind it. Kidney half or more in roof of mantle cavity. Renal gland transverse. Pericardium half or more in roof of mantle cavity, overlapping posterior end of ctenidium or abutting posterior end of ctenidium.

Radula ( Fig. 19 G–I). Central teeth with cusp formula 3–5+1+3–5, basal cusps 1+1; median cusp about twice as long as adjacent cusps, blunt. Lateral teeth with cusp formula 3–4+3–5; main cusp nearly twice as long as adjacent cusps, blunt. Inner marginal teeth with 16–22 cusps. Outer marginal teeth with 16–18 cusps.

Female reproductive system ( Fig. 16O, P ). Ovary simple sac. Renal oviduct forms small loop. Seminal receptacle near anterior edge of bursa, elongate, duct very short; orientated sperm also located in renal oviduct. Bursa copulatrix overlapping albumen gland on left, elongately-oval or vertically-oval, shorter than albumen gland, bursal duct enters bursa mid anteriorly, 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 two distinct glandular zones, medium thickness in cross section, markedly indented by rectum. Anterior vestibule large, opening subterminal, short, cowl and/or gutter associated with oviduct opening present.

Male reproductive system ( Fig. 17H , 18J, K ). Prostate gland mostly in mantle roof, bean-shaped, medium in cross section. Posterior pallial vas deferens coiled, anteriorly coiled. Penis towards middle of head, well down neck, distal end broad, tapering, terminal papilla absent.

Etymology. Named after Chillagoe Station.

Distribution and habitat. Known only from a small group of warm springs in the northern part of the Einasleigh Uplands on the northern side of the Walsh River, north of Chillagoe ( Fig. 1 ), about 205 km west of Cairns.

Remarks. This species is found in a small cluster of small, shallow warm springs that are fed by a local aquifer, as the locality lies outside the GAB in the northern part of the volcanic Einasleigh Uplands. These small snails closely resemble Ed. (B.) routhensis , one of the two other species found in the Einasleigh Uplands, in anatomical and shell characters. Molecular data separates them, but these two species are sister taxa in our trees (see below). Morphologically, they differ in the shell of Ed. (B.) routhensis being more pupiform, with that of Ed. (B.) chillagoensis being broader and with the inner lip of the aperture more distinctly separated from the parietal wall. Anatomically they are similar, with both species having a short bursal duct that joins the common oviduct well behind the posterior wall of the mantle cavity. The vestibule in Ed. (B.) routhensis extends to the end of the capsule gland, but in Ed. (B.) chillagoensis it terminates a little behind the end of the capsule gland and the opening is hidden behind an anteriorly extending cowl that is absent in Ed. (B.) routhensis . The males have similar penes but the pallial vas deferens in Ed. (B.) chillagoensis is has multiple coils while in Ed. (B.) routhensis it is only slightly undulating.

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 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 19. Radulae of species of Edgbastonia (Barcaldonia) n. subgen. A, B. Edgbastonia (B.) rugosa n. sp. A. Half row. B. Lateral teeth (C.457753). C, D. Edgbastonia (B.) corrugata umbilicata n. subsp. C. Half row. D. Lateral and marginal teeth (C.415845). E, F. Edgbastonia? conjuboyensis n. sp. E. Half row. F. Marginal teeth (C.445416). G, H, I. Edgbastonia (B.) chillagoensis n. sp. G. Half row. H. Lateral and marginal teeth. I. Outer marginal teeth (C.438557). Scale bars 10 µm.