Eulodrobia bundoona, 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 : 18-19

Eulodrobia bundoona n. sp.

Jardinella n. sp. umb. Perez et al. 2005: 547 (incorrectly cited as C.400133 = C.400132)

Material examined. Holotype: Queensland, Yowah Creek Springs, on Bundoona Station , 27° 57' 08" S, 144° 46' 12" E, in flowing water, at spring head and outflow, up to 15–20 cm from spring head, W.F. Ponder & C. Lydeard, 2 May 2001, C.479943 . Paratypes: Same data. C.400132, 20+; QM MO85763 , 5 . Other material examined: Queensland, Yowah Creek Springs, on Bundoona Station , main spring, area around head of spring, 27° 57' 07" S, 144° 46' 08" E, mostly on thick wet mud, out of water flow, amongst grass-like vegetation, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 4 Apr 2002 , C.421808, 20+; main spring, main flow area, 27° 57' 07" S, 144° 46' 08" E, seepage/flow areas of spring, short sedges & duck weed, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 4 Apr 2002, C.421811, 20+; main spring, outflow area, 27° 57' 07" S, 144° 46' 08" E, edges of spring, deeper pools with sedges, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 4 Apr 2002, C.421814, 14; head of small spring flowing into pool, near main spring, 27° 57' 07" S, 144° 46' 08" E, seepage, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 4 Apr 2002, C.421815, 20+; Queensland, Yowah Creek Springs, on Bundoona Station , walking distance from QMS-04, 27° 56' 56" S, 144° 46' 23" E, mud, W.F. Ponder & C. Lydeard, 2 May 2001 , C.572057.

Shell ( Fig. 2E , 3D ). Depressed-ovate, spire outline moderately convex, normally coiled, opaque. Length 2.6– 3.4 mm (mean 3.0 mm), width 3.4–4.1 mm (mean 3.6 mm). Protoconch of about 1.3 whorls, with irregular pitting and wrinkles ( Fig. 3D ). Teleoconch whorls weakly convex, evenly rounded, total number 3.7–4.0 (mean 3.9). Umbilicus moderately wide. Sculpture of irregular growth lines and few spiral to sub-spiral wrinkles. Aperture pyriform, inner lip narrow, thin, firmly attached to parietal wall, outer lip thin. Periostracum moderately developed, yellow-brown.

Operculum ( Fig. 4G, H ). Transparent, pale yellow, flat or slightly concave; nucleus subcentral. Inner side lacking white smear, with slightly raised pimple near apex, operculum—pimples or pegs on inner side same colour as rest of operculum.

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

Mantle cavity. Ctenidium well-developed, filaments 21–33, broadly triangular. Osphradium narrowly oval, towards posterior end of ctenidium, length relative to gill 0.25–0.35. Hypobranchial gland well-developed (thick), or moderately developed. Rectum with U-shaped bend, anus near mantle collar or just behind it. Kidney extends for about quarter of length into mantle cavity roof. Renal gland longitudinal. Pericardium extends for about quarter of length into mantle cavity roof, overlapping posterior end of ctenidium.

Radula ( Fig. 5 I–K). Central teeth with cusp formula 5–7+1+5–7 (usually 6+1+6), basal cusps 2+2; median cusp spathulate, up to nearly twice as long as adjacent cusps. Lateral teeth with cusp formula 4–5+1+5, main cusp spathulate, about a third longer than adjacent cusps. Inner marginal teeth with 31–35 cusps; cusp 3 or 4 from proximal end of cutting edge markedly larger than adjacent cusps ( Fig. 5K ). Outer marginal teeth with about 40–46 cusps.

Female reproductive system ( Fig. 6G, H ). Ovary simple sac. Renal oviduct with initial U-shaped arch and then rather short loop over anterior end of bursa copulatrix. Seminal receptacle absent; orientated sperm in bursal duct. Bursa copulatrix overlapping albumen gland on left, elongately-oval, shorter than albumen gland, bursal duct enters bursa mid anteriorly, bursal duct joins coiled oviduct little behind posterior mantle cavity wall. Albumen gland behind posterior mantle cavity wall. Capsule gland with two distinct glandular zones, thick in cross section, slightly indented by rectum. Anterior vestibule small, opening subterminal, short.

Male reproductive system ( Figs. 7D , 8D ). Prostate gland less than half in mantle roof, oval, medium in cross section. Posterior pallial vas deferens slightly undulating, anteriorly strongly undulating. Penis towards middle of head, intermediate, distal end tapering, terminal papilla and lobes absent.

Etymology. Named for Bundoona Station.

Distribution and habitat. Found only in the Yowah Creek Springs, on Bundoona Station about 36 km NW of Eulo, where it lives in grass-like vegetation on soft mud around the head of the springs.

Remarks. This is the largest species of Eulodrobia and is restricted to the Yowah Creek Springs, on Bundoona Station, where it usually lives together with Eu. ovata . It differs from that species in its relatively much shorter spire and wider umbilicus. Compared with the other species from the Eulo Supergroup, it is also somewhat similar to Eu. eulo from which it differs in its larger size, much greater radula cusp counts, its subcentral opercular nucleus and in anatomical details, notably the absence of a seminal receptacle. As in Eu. ovata , very weak spiral sculpture is present on the teleoconch.

A discriminant function analysis of five shell measurements of 20 specimens of both E. bundoona and E. ovata produced 100% correct identification (Wilks Lambda 0.023, p <0.000).

Figures

FIGURE 2. Shells of species of Eulodrobia n. gen. A. Eulodrobia fenshami n. sp., holotype, spring at Town Common, Eulo (C.479950). B. Eulodrobia eulo (Ponder & Clark, 1990), paratype, Massey Spring (C.156779). C. Eulodrobia cf. eulo (Ponder & Clark, 1990), Tunga Spring (C.410643). D. Eulodrobia ovata n. sp., holotype, Yowah Springs, Bundoona Station (C.479944). E. Eulodrobia bundoona n. sp., holotype, Yowah Springs, Bundoona Station (C.479943). F. Eulodrobia carinata n. sp., holotype, Yowah Springs, Bundoona Station (C.479942). G–I. Eulodrobia spirula n. sp., Yowah Springs, Bundoona Station. G. dorsal view of holotype (479945). H, I. apertural view of paratypes (C.400133). Scale bars 1 mm.

FIGURE 3. Protoconchs and protoconch microsculpture of species of Eulodrobia n. gen. A. Eulodrobia fenshami n. sp., paratype, spring at Town Common, Eulo (C.410721). B. Eulodrobia eulo (Ponder & Clark, 1990), paratype, Massey Spring (C.156779). C. Eulodrobia ovata n. sp., paratype, Yowah Springs, Bundoona Stn (C.400130). D. Eulodrobia bundoona n. sp., paratype, Yowah Springs, Bundoona Stn (C.400132). E. Eulodrobia carinata n. sp., paratype, Yowah Springs, Bundoona Stn (C.400131). F. Eulodrobia spirula n. sp., paratype, Yowah Springs, Bundoona Stn (C.400133). Scale bars 100 µm (lowpowered images [left]), 10 µm (high-powered images [right]).

FIGURE 4. Opercula of species of Eulodrobia n. gen., external and internal views of each species. A, B. Eulodrobia fenshami n. sp., paratype, spring at Town Common, Eulo (C.410721). C, D. Eulodrobia eulo (Ponder & Clark, 1990), paratype, Massey Spring (C.156779). E, F. Eulodrobia ovata n. sp., paratype, Yowah Springs, Bundoona Stn (C.400130). G, H. Eulodrobia bundoona n. sp., paratype, Yowah Springs, Bundoona Stn (C.400132). I, J. Eulodrobia carinata n. sp., paratype, Yowah Springs, Bundoona Stn (C.400131). K, L. Eulodrobia spirula n. sp., paratype, Yowah Springs, Bundoona Stn (C.400133). Scale bars 500 µm.

FIGURE 5. Radulae of Eulodrobia n. gen. A, B. Eulodrobia fenshami n. sp., paratype, spring at Town Common, Eulo (C.410721). A, half rows, B, detail of lateral tooth. C–E. Eulodrobia eulo (Ponder & Clark, 1990), paratype, Massey Spring (C.156779), C, half rows, D detail of lateral tooth, E, detail of central tooth. F–H. Eulodrobia ovata n. sp., paratype, Yowah Springs, Bundoona Stn (C.400130). F. Detail of central tooth. G. Detail of inner marginal tooth. H. Detail of outer lateral teeth. I–K. Eulodrobia bundoona n. sp., paratype, Yowah Springs, Bundoona Stn (C.400132). I. Part of tooth row. J. Detail of lateral teeth. K. Detail of inner marginal tooth. L.Eulodrobia carinata n. sp., paratype, Yowah Springs, Bundoona Stn (C.400131), half rows. M. N. Eulodrobia spirula n. sp., paratype, Yowah Springs, Bundoona Stn (C.400133), half rows. Scale bars 10 µm.

FIGURE 6. Female reproductive system of species of Eulodrobia n. gen., shown from left side. A, B. Eulodrobia fenshami n. sp. (C. 410721). C, F. Eulodrobia eulo (Ponder & Clark, 1990) (C. 410724). D, E. Eulodrobia ovata n. sp. (C. 400130). G, H. Eulodrobia bundoona n. sp. (C.400132). I, L. Eulodrobia spirula n. sp. (C.400133). J, K. Eulodrobia carinata n. sp. (C.400131). Abbreviations: ag—albumen gland; bc—bursa copulatrix; cg—capsule gland; ga—opening of oviduct; pwposterior wall of mantle cavity; ro—renal oviduct; sr—seminal receptacle; v—vestibule; vc—ventral channel. Scale bars 500 µm.

FIGURE 7. Prostate and vas deferens of species of Eulodrobia n. gen. Each species is shown with anterior at left and posterior at right, with line indicating position of posterior pallial wall. A. Eulodrobia fenshami n. sp. (C. 410721). B. Eulodrobia eulo (Ponder & Clark, 1990) (C. 410724). C. Eulodrobia ovata n. sp. (C.400130). D. Eulodrobia bundoona n. sp. (C.400132). E, Eulodrobia carinata n. sp. (C. 400131). F. Eulodrobia spirula n. sp. (C.400133). Abbreviations: avd—anterior vas deferens; pw—position of posterior wall of pallial cavity; ve—posterior vas deferens. Scale bars 200 µm.

FIGURE 8. Penis and vas deferens of species of Eulodrobia n. gen. A. Eulodrobia fenshami n. sp. (C. 410721). B. Eulodrobia eulo (Ponder & Clark, 1990) (C. 410724). C. Eulodrobia ovata n. sp. (C. 400130). D. Eulodrobia bundoona n. sp. (C.400132). E, Eulodrobia carinata n. sp. (C. 400131). F. Eulodrobia spirula n. sp. (C.400133). Abbreviations: ngl—non-glandular lobe; pd—penial duct; vd—vas deferens. Scale bars 200 µm.