Eulodrobia carinata, 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 : 19-21

Eulodrobia carinata n. sp.

Jardinella n. sp. keel Perez et al. 2005: 547 (incorrectly cited as C.400132 = C.400131). 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, Queensland, W.F. Ponder & C. Lydeard, 2 May 2001, C.479942. Paratypes: Same data, C.400131, 50+; QM MO85764 , 5 . Other material examined: Queensland, Yowah Creek Springs, on Bundoona Station , main spring, head of spring, 27° 57' 07" S, 144° 46' 08" E, on wet sand, mostly out of water flow, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 4 Apr 2002, C.421805, 2; main spring, area around head of spring, 27° 57' 07" S, 144° 46' 08" E, mostly on thick wet mud, out of water flow, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 4 Apr 2002, C.421810, 4 .

Shell ( Fig. 2F , 3E ). Depressed-ovate, spire outline slightly convex, normally coiled, opaque. Length 1.3–1.6 mm (mean 1.5 mm), width 2.3–2.9 mm (mean 2.6 mm). Protoconch of about 1.3 whorls, with most of first whorl distinctly pitted and with irregular axial threads; last third whorl with fine pitting and distinct axial ridges ( Fig. 3E ). Teleoconch whorls weakly convex, strongly keeled in middle of periphery, total number 3.0–3.5 (mean 3.3). Umbilicus wide, open. Sculpture of growth lines and some weak spiral threads on peripheral area. Aperture circular, inner lip narrow, thin, firmly attached to parietal wall or slightly to moderately separated along whole length of parietal wall, outer lip thin. Periostracum moderately developed, yellow-brown or reddish-brown.

Operculum ( Fig. 4I, J ). Translucent, brown, slightly convex, nucleus near central. Inner side with white streak or smear present, with slightly raised whitish pimple near apex.

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

Mantle cavity. Ctenidium well-developed, filaments 19, broadly triangular, apex right edge. Osphradium narrowly oval, towards posterior end of ctenidium or at middle of ctenidium, length relative to gill 0.2–0.31. Hypobranchial gland moderately developed. Rectum with U-shaped bend, anus behind mantle collar. Kidney extends for about quarter of length into mantle cavity roof. Renal gland transverse. Pericardium extends for about quarter of length into mantle cavity roof, overlapping posterior end of ctenidium or abutting posterior end of ctenidium.

Radula ( Fig. 5L ). Central teeth with cusp formula 2+1+2, basal cusps 2+2; median cusp spathulate to triangular, about twice to three times as long as adjacent cusps. Lateral teeth with cusp formula 3–4+1+1(–2), main cusp triangular, about twice length of adjacent cusps. Inner marginal teeth with 25–27 cusps. Outer marginal teeth with 22–23 cusps.

Female reproductive system ( Fig. 6J, K ). Ovary weakly lobed; renal oviduct lacking initial U-shaped arch but weak bend may be present; forms near circular loop over bursa copulatrix. Seminal receptacle absent; orientated sperm in renal oviduct. Bursa copulatrix overlapping albumen gland on left, pyriform, 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, medium thickness in cross section, markedly indented by rectum. Anterior vestibule small, opening subterminal, intermediate in size.

Male reproductive system ( Figs. 7E , 8E ). Prostate gland less than half in mantle roof, oval, medium in cross section. Posterior pallial vas deferens straight, anteriorly slightly undulating. Penis towards middle of head, well down neck, distal end tapering, terminal papilla small, with small near-terminal non-glandular lobe.

Etymology. Carinatus—Latin, keeled.

Distribution and habitat. Found only in the main spring, Yowah Creek Springs, on Bundoona Station, about 36 km NW of Eulo ( Fig. 1 ), where it lives in the very shallow spring outflow. This spring has well oxygenated, clean water and coarse sediment.

Remarks. This distinctive species lives in the shallow outflow of the main spring together with the species described immediately below. It differs from all other species in the GAB (and in Australia) in having a prominent, flange-like keel on the periphery. Compared to the other species from the Eulo Supergroup, it is most similar to the species described below and is contrasted under that species.

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 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.