Eulodrobia eulo ( Ponder & Clark, 1990 )

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 : 8-11

publication ID

https://doi.org/ 10.11646/zootaxa.4583.1.1

publication LSID

lsid:zoobank.org:pub:27F24995-359E-46F6-AB22-75568BACFDCF

persistent identifier

https://treatment.plazi.org/id/724987F6-FF81-2417-FF7E-B970FF393EA8

treatment provided by

Plazi

scientific name

Eulodrobia eulo ( Ponder & Clark, 1990 )
status

 

Eulodrobia eulo ( Ponder & Clark, 1990) View in CoL and Eulodrobia cf. eulo .

Jardinella eulo Ponder & Clark, 1990: 342 View in CoL , figs. 6C, 31A, B, 32, A, B, 33C, D, 34D, F. Jardinella eulo Perez et al. 2005: 547 View in CoL (C.400135); Jardinella sp. Commonwealth of Australia, 2014: 37 (= Eulodrobia cf. eulo View in CoL ).

Material examined. Eu. eulo . Queensland, Massey Spring (=Rocky Springs), Granites Springs, near Mt Francis

ca 52 km SW of Eulo, 28° 18' 00" S, 144° 32' 00" E, on small-leaved plants, W.F. Ponder & P.H. Colman, 7 Sep 1984 (holotype, C.156778, and paratypes, C.156779). Additional material from same locality, C.410724, C.479953.

Eu. cf. eulo ‘Unnamed spring’ (=Tunga Spring) at Tunga Bore, Queensland, 28° 13' 00" S, 144° 38' 00" E, 6 Sep 1984, W.F. Ponder & P.H. Colman, spring flows into boulder strewn creek, C.156780 (designated as paratypes of Eu. eulo ). Other material from same locality 28 Aug 2000, R. J. Fensham, artesian spring with flow enhanced by bore head, on mud and plant surfaces, C.410643 (SEM material), 20+; C.479952, 1; 2 May 2001, W.F. Ponder & C. Lydeard, in shallow muddy habitat at head of spring, C.400135 (molecular sample).

Shell ( Fig. 2B, C View FIGURE 2 , 3B View FIGURE 3 ). Ovate, spire outline slightly convex, normally coiled, opaque. Length 1.44–2.43 mm (mean 2.4 mm), width 1.5–2.3 mm (mean 1.9 mm). Protoconch of 1.5 whorls, minutely and irregularly pitted ( Fig. 3B View FIGURE 3 ). Teleoconch whorls moderately convex, evenly rounded, total number 3.5–4.3 (mean 3.6). Umbilicus moderate. Sculpture of close growth lines, often raised into weak riblets. Aperture ovate, inner lip narrow, thick, slightly separated along whole length of parietal wall, outer lip medium thickness. Periostracum moderately developed, yellow-brown to reddish or orange-brown.

Operculum ( Fig. 4C, D View FIGURE 4 ). Translucent, yellow-brown, slightly concave, nucleus acentric. Inner side lacking white smear, simple except for low rounded thickening at nucleus.

Head-foot and external body. Snout black, tentacles dark grey; dorsal and lateral parts of foot and opercular lobes pigmented, mantle roof and visceral coil black.

Mantle cavity. Ctenidium well-developed, filaments 24–28, broadly triangular, apex towards right. Osphradium narrowly oval, towards posterior end of ctenidium, length relative to gill 0.29–0.31. Hypobranchial gland thin. Rectum with U-shaped bend, with longitudinal to oblique pellets, anus behind mantle collar. Kidney extends for about one third to one half of length into mantle cavity roof. Renal gland longitudinal. Pericardium extends for about one third to one half of length into mantle cavity roof, overlapping posterior end of ctenidium.

Radula ( Fig. 5 View FIGURE 5 C–E). Central teeth with cusp formula 3+1+3, basal cusps 2+2; median cusp narrow, pointed, about 3 times longer than adjacent cusps (note: worn in Fig. 5E View FIGURE 5 ). Lateral teeth with cusp formula 2–3+1+2–3, main cusp narrow, blunt or pointed, about twice as long as adjacent cusps. Inner marginal teeth with 12–16 cusps. Outer marginal teeth with 17–21 cusps.

Female reproductive system ( Fig. 6C, F View FIGURE 6 ). Ovary weakly lobed. Renal oviduct with single ( Fig. 4 View FIGURE 4 ) or double ( Ponder & Clark 1990, fig. 34E) U-shaped arch. Seminal receptacle oval, duct very short. Bursa copulatrix behind albumen gland, pyriform to oval, shorter than albumen gland, bursal duct enters bursa anteroventrally, bursal duct joins coiled oviduct well behind posterior mantle cavity wall. Albumen gland partly in mantle cavity. Capsule gland with two distinct glandular zones apparent in some, medium thickness in cross section, slightly indented by rectum. Anterior vestibule small, opening terminal.

Male reproductive system ( Figs. 7B View FIGURE 7 , 8B View FIGURE 8 ). Prostate gland less than half in mantle roof, bean-shaped, medium in cross section. Posterior pallial vas deferens slightly undulating to (usually) coiled, anteriorly slightly undulating. Penis behind right eye well down neck, distal end broad, terminal papilla absent, two non-glandular lobes present.

Distribution and habitat. Restricted to Massey Spring, Granites Spring group, a small spring on Granite Springs Station, Eulo Supergroup ( Commonwealth of Australia 2014) ( Fig. 1 View FIGURE 1 ). This species was absent in a few other nearby small springs which occur in the Granites Spring group. A similar taxon occurs in Tunga Spring (see Remarks). Massey Spring and Tunga Spring are about 11 km apart and on two different local drainage systems, although both are tributaries of the Paroo River system. These populations can be formally distinguished by referring to them as Eulodrobia eulo (from Massey Spring) and Eu. cf. eulo (from Tunga Spring).

Remarks. This species was originally recorded from both Massey Spring (= Granite or Rocky Springs) and Tunga Spring (at Tunga Bore). Molecular data for both populations (see Fig 31 View FIGURE 31 ) shows some differentiation suggesting that separate species-group status may eventually be necessary. Although the Tunga Spring population has not been examined anatomically, its shell, opercular and radular characters are very similar to those of specimens from Massey Spring. Also, the operculum in both populations has the same raised nipple-like thickening at the nucleus. However, a discriminant function analysis separated most specimens of the two forms, as detailed below in the Remarks under the next species.

The spring at the type locality (Massey Spring) is a medium-sized spring ( Commonwealth of Australia 2014) about 52 km SW of the village of Eulo while the other known population lives in a tiny spring next to Tunga Bore, which is located near Mt Tunga, about 45 km WSW of Eulo, south-western Queensland. Other springs near both these springs have substantially decreased in flow ( Commonwealth of Australia 2014), and none contain these snails.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Tateidae

Genus

Eulodrobia

Loc

Eulodrobia eulo ( Ponder & Clark, 1990 )

Zhang, - H. 2019
2019
Loc

Jardinella eulo

Commonwealth of Australia 2014: 37
Perez, K. E. & Ponder, W. F. & Colgan, D. J. & Clark, S. A. & Lydeard, C. 2005: 547
Ponder, W. F. & Clark, G. A. 1990: 342
1990
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