Conondalia buzwilsoni, 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 : 53-54

Conondalia buzwilsoni n. sp.

Material examined. Holotype: Queensland, S of Gympie, Conondale SF, tributary of Tragedy Creek , 26° 43' 30" S, 152° 37' 30" E, on leaves in sandy bottom pools, W.F. Ponder, W.F. Ponder Jnr and O.L. Griffiths, 0 8 Sep 1982, C.479954 . Paratypes: Same data, C. 200788, 20+; QM MO85773 , 3 . Other material examined: Queensland, S of Gympie, Conondale SF, Scrubby Creek , a tributary of Tragedy Creek , 26° 43' 32" S, 152° 37' 18" E, W.F. Ponder, 4 Mar 2009 , C.462966, 20+.

Shell ( Fig. 25 A–E). Ovate-conic, spire outline moderately convex, normally coiled, opaque. Length 2.6–3.3 mm (mean 2.9 mm), width 1.8–2.2 mm (mean 2.0 mm). Protoconch of about 1.5 whorls, with weak irregular transverse folds and scattered pustules on first half whorl, no folds and weaker pustules on last whorl. Teleoconch whorls strongly convex, evenly rounded, total number 4.2–4.6 (mean 4.4). Umbilicus narrow and open. Aperture pyriform, inner lip narrow, medium, slightly separated over posterior part of parietal wall, outer lip thickened. Periostracum well-developed, stained black in type material.

Operculum ( Fig. 25 F–I). Transparent, pale yellow, slightly concave. Inner side with white streak or smear present, simple except for some rudimentary thickening which represents about 4 peg remnants (see Fig. 25H, I ).

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

Mantle cavity. Ctenidium well-developed, filaments 24–29, broadly triangular, apex right edge. Osphradium narrowly oval, towards posterior end of ctenidium, length relative to gill 0.22–0.32. Hypobranchial gland welldeveloped (thick). Rectum with U-shaped bend, anus behind mantle collar. 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.

Radula ( Fig. 26 ). Central teeth with cusp formula 3–5+1+4–5, basal cusps 2+2, rudimentary outer denticle sometimes present; median cusp pointed, about one third to nearly twice as long as adjacent cusps. Lateral teeth with cusp formula 3–4+1+4–5; main cusp broader than adjacent cusps and about one third longer, pointed. Inner marginal teeth with 18–24 cusps. Outer marginal teeth with 26–30 cusps.

Female reproductive system ( Fig. 27C, D ). Ovary with weak lobes. Renal oviduct with long vertical Ushaped arch. Seminal receptacle absent; orientated sperm located in renal oviduct. Bursa copulatrix overlapping albumen gland on left, round or pyriform, shorter than albumen gland, bursal duct enters bursa mid anteriorly or antero-ventrally, bursal duct joins coiled oviduct little 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 not defined, opening subterminal or well behind anterior end of capsule gland, intermediate in size.

Male reproductive system ( Fig. 27A, B ). Prostate gland less than half in mantle roof, bean-shaped, medium in cross section. Posterior pallial vas deferens straight or slightly undulating, anteriorly slightly undulating. Penis towards middle of head, well down neck, distal end tapering, terminal papilla absent.

Etymology. Named for Dr. George (Buz) Wilson in appreciation of his help and company on several field trips with WFP.

Distribution and habitat. Small streams in the Conondale State Forest ( Fig. 1 ), south of Gympie, Queensland.

Remarks. As noted above, this species is representative of several species that occur in coastal drainages in this part of Queensland. For example, a nearby population has a single peg rudiment on the operculum and is likely a separate species. We have not attempted to revise or name the other material from this area in the current paper.

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 25. Shell and operculum of Conondalia buzwilsoni n. gen. and n. sp. A–C. Shell. A, C. Paratypes (C.200788). B. Holotype (C. 479954). D. Protoconch (C.200788). E. Detail of protoconch microsculpture (C.200788). F–I. Operculum, outer (F), and inner (G) sides, and detail of rudimentary pegs (H, I) (C.200788).

FIGURE 26. Radula of Conondalia buzwilsoni n. gen. and n. sp. (C.200788). A. Half row of radula. B. Detail of central tooth. C. Detail of lateral and marginal teeth. Scale bars 10 µm.

FIGURE 27. Male and female reproductive anatomy of Conondalia buzwilsoni n. gen. and n. sp. (C.200788). A. Penis, showing penial duct and vas deferens. B. Prostate, with associated vas deferens and vas efferens. C. Female system from left side. D. Bursa copulatrix and seminal receptacle. Abbreviations: ag—albumen gland; avd—anterior vas deferens; bc—bursa copulatrix; cg—capsule gland; o—opening of oviduct; pd—penial duct; pvd—posterior vas deferens; pw—posterior wall of mantle cavity; ro—renal oviduct; sr—seminal receptacle; vc—ventral channel. Scale bar 200 µm.