Eulodrobia ovata Zhang 2019, n. sp.
Creators: name: Zhang, - H.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Tateidae
Eulodrobia
Eulodrobia ovata

description: Eulodrobia ovata n. sp.
Jardinella n. sp. (C.400130, C.400128, C.400129)— Perez 2005: 547.
Material examined. Holotype: 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.479944. Paratypes: Same data. C.400130, 14; QM MO85762, 3. Other material examined: Queensland, Yowah Creek Springs, on Bundoona Station, pool nearest to road, alongside creek, Queensland, 27° 56' 28" S, 144° 46' 42" E, on and in mud and on vegetation, both in and out of water, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 6 Apr 2002, C.423258, 20+; pool nearest to creek, Queensland, 27° 56' 28" S, 144° 46' 42" E, on and in mud and on vegetation, both in and out of water, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 6 Apr 2002, C.431166, 20+; pool furthest away from creek and road, 27° 56' 28" S, 144° 46' 42" E, in water, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 6 Apr 2002, C.431167, 1, C.431168, 20+; small spring, head of spring, 27° 56' 56" S, 144° 46' 22" E, on mud and in water, W.F. Ponder, J.H. Waterhouse & A.C. Miller, 4 Apr 2002. Also, other lots with similar data including C.431169, 20+; C.423251, 9; C.423250, 13; C.410642, 16.
Shell (Fig. 2D, 3C). Ovate, spire outline moderately convex, normally coiled, opaque. Length 2.6–3.2 mm (mean 2.9 mm), width 2.5–2.9 mm (mean 2.7 mm). Protoconch of about 1.5 whorls, very minutely pitted (Fig. 3C). Teleoconch whorls weakly convex, evenly rounded, total number 3.8–4.3 (mean 4.1). Umbilicus narrow and open. Sculpture of irregular growth lines and weak spiral rugae. Aperture pyriform, inner lip narrow, medium, moderately separated from parietal wall posteriorly, outer lip medium. Periostracum moderately developed, yellow-brown.
Operculum (Fig. 4E, F). Translucent, brown, slightly concave; nucleus acentric. Inner side lacking white smear, with low pimple near apex, same colour as rest of operculum or whitish in some specimens.
Head-foot and external body. Snout, tentacles, neck and opercular lobes pigmented, dorsal and lateral foot unpigmented, mantle roof black, visceral coil densely pigmented.
Mantle cavity. Ctenidium well-developed, filaments 22–24, broadly triangular. Osphradium narrowly oval, at middle of ctenidium, length relative to gill 0.41–0.5. Hypobranchial gland moderately developed. Rectum with or without arch, anus behind mantle collar. Kidney extends for about third of length into mantle cavity roof. Renal gland transverse. Pericardium extends for about quarter of length into mantle cavity roof, abutting posterior end of ctenidium.
Radula (Fig. 5 F–H). Central teeth with cusp formula (3–)4+1+(3–)4, basal cusps 2(–3)+2(–3); median cusp elongately triangular, much longer than adjacent cusps. Lateral teeth with cusp formula 2+1+2–3, main cusp elongately triangular, much longer than adjacent cusps. Inner marginal teeth with 15–18 cusps, second to third to most proximal larger than adjacent cusps. Outer marginal teeth with 20–24 cusps.
Female reproductive system (Fig. 6D, E). Ovary weakly lobed. Renal oviduct with small initial U-shaped arch then forms long loop over bursa copulatrix. Seminal receptacle anterior to bursa or near anterior edge of bursa, oval, duct very short; orientated sperm also in renal oviduct. Bursa copulatrix overlapping albumen gland on left, elongately-oval, about same length as albumen gland or shorter than albumen gland, bursal duct enters bursa antero-ventrally, bursal duct joins coiled oviduct little behind posterior mantle cavity wall. Albumen gland partly in mantle cavity, or about half in pallial cavity. Capsule gland with two distinct glandular zones, medium thickness in cross section, slightly indented by rectum. Anterior vestibule not defined or small, opening subterminal, intermediate in size.
Male reproductive system (Figs. 7C, 8C). Prostate gland less than half in mantle roof, bean-shaped, thin in cross section. Posterior and anterior pallial vas deferens slightly undulating. Penis towards middle of head, well down neck, distal end broad, terminal papilla small, near-terminal non-glandular lobe-like swelling present.
Etymology. Ovatus—Latin, egg-shaped, ovate.
Distribution and habitat. Yowah Creek Springs, on Bundoona Station about 36 km NW of Eulo (Fig. 1), living in swampy conditions in muddy sediment.
Remarks. Found in the Yowah Creek Springs on Bundoona Station, together with the three species described below, although it favours different microhabitats, being mainly found associated with wet mud in the top of mounds amongst sedges and grass. It differs from the sympatric species described below in its ovate shell. Compared to the other species from the Eulo Supergroup, it is most similar to Eu. bundoona n. sp. in size but that species differs in its more depressed spire and much wider umbilicus. Unusually, weak spiral rugae are present and similar but weaker spirals are also present in Eu. bundoona n. sp. Eu. ovata n. sp. also resembles Eu. fenshami n. sp. in shape but is larger and differs in having a short bursal duct, and in this feature, it resembles Eu. eulo, as it does also in having a pimple-like projection on the inner side of the operculum.
description: Published as part of 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, pp. 1-67 in Zootaxa 4583 (1) on pages 15-17, DOI: 10.11646/zootaxa.4583.1.1, http://zenodo.org/record/2637603