Gabbia lutaria, Ponder, 2003

Ponder, Winston F., 2003, Monograph of the Australian Bithyniidae (Caenogastropoda: Rissooidea), Zootaxa 230 (1), pp. 1-126 : 98-101

publication ID

https://doi.org/ 10.11646/zootaxa.230.1.1

publication LSID

lsid:zoobank.org:pub:AE9A8BE3-1CBD-4958-991A-C6EC1F203AF2

DOI

https://doi.org/10.5281/zenodo.5098509

persistent identifier

https://treatment.plazi.org/id/0C12051D-230C-FF9F-FECC-FE42C8A4B3F0

treatment provided by

Felipe

scientific name

Gabbia lutaria
status

sp. nov.

Gabbia lutaria View in CoL n.sp.

Etymology Lutarius (L.) ­ of mud.

Type material

Billabong 1.7 km W of East Baines R, N of Victoria Hwy, Victoria R District, NT, 15° 45.170'S, 130° 2.480'E, 27 JUN 1996, V.Kessner (Holotype, AMS C.417680; GoogleMaps paratypes AMS C.318599, 41; AMS C.380764, 5; VKC 24320, 15); West Baines Minor R, S of Victoria Hwy , Victoria R District , 15° 55.970'S, 129° 44.670'E, 2 JUL 1996, V.Kessner (Paratypes, VKC 24321, 4 ); GoogleMaps West Baines Minor R, 15° 56.020'S, 129° 44.660'E, shallow pools, in mud & on pool edges, 29 JUN 1999, W.F.Ponder (Paratypes AMS C.371666, 83 wet; AMS C.371668, 247 wet; NTM P21376, 8; WAM S10884 View Materials , 5) GoogleMaps .

Additional material examined

Northern Territory: Kings Billabong , 2 km SW of East Baines R , along Victoria Hwy , Victoria R district, 15° 46.780'S, 130° 0.870'E, 27 JUN 1996, V. Kessner ( VKC 24319, 1 ); billabong at side of GoogleMaps Victoria Hwy between Timber Ck TS and WA border, 15° 45.180'S, 130° 2.650'E, on mud, 27 JUN 1996, W.F.Ponder, A.C.Miller, D.L.Beechey & V. Kessner ( AMS C.318735, 32) GoogleMaps .

Description

Shell ( Fig. 36A View FIGURE 36 ) very small (up to 2.7 mm in length), broadly­ovate, with up to 4.0 convex whorls. Protoconch of about 1.5 smooth whorls. Teleoconch sculptured with close, narrow axial ribs crossed by fine, close spiral lirae; base evenly convex; umbilicus moderate to wide. Aperture broadly ovate; peristome moderately thickened in adults; outer lip prosocline. Colour: shell opaque to semitranslucent, periostracum thin, white to pale yellowish­brown.

Dimensions. See Table 25 for dimensions of holotype and Appendix, Table 29 View TABLE 29 , for summary shell dimensions and whorl counts.

Operculum ( Fig. 32I,J View FIGURE 32 ) typical of genus. Ovate, slightly concave, translucent colourless to yellowish, concentric growth lines only in most specimens, one or two distinct ridges in some; inner surface with muscle scar occupying most of surface, sculptured with very weak concentric folds.

Radula (Appendix Table 30 View TABLE 30 ; Fig. 33L,M View FIGURES 33 ) typical of genus. Central teeth with 2­3 cusps on either side of median cusp which is about 1.4­1.5 longer than adjacent cusps and its base slightly wider to about 1.3 as wide; median cusp tapering to a sharp point. Face of central tooth with 3­4 pairs of cusps that extend to just inside lateral margin forming cuspate ridge, inner pair much larger than others, nearly half total height of tooth; lateral margins slightly convex to slightly concave, at about 50­60º; basal tongue moderately long, triangular, bluntly pointed. Lateral teeth with cusp formula 2­3 + 1 + 3­5; with cutting edge about 0.42­0.45 length of lateral part of tooth; median cusp about 1.5 as long as adjacent cusps, proximately parallel­sided to very slightly tapering, distally rapidly tapering to point or rounded; upper edge of lateral part of tooth at about 60­70º to cutting edge, lateral edge straight to slightly concave. Inner marginal teeth with 17­23 cusps, outer marginals with 10­12 cusps.

. Head foot and anatomy not examined.

Distribution ( Fig. 35 View FIGURE 35 ) and habitat. This species lives in fine mud in pools in the East and West Baines Rivers, both western tributaries of the Victoria R in the western Northern Territory.

Remarks

This species is very similar to G. adusta n. sp. but differs in its smaller size and relatively shorter spire. A discriminant function analysis separated all specimens of G. lutaria from G. adusta and G. clathrata n. sp. (Fig. 38).

FIGURE 38. Plot of the canonical scores obtained from a discriminant function analysis using all shell measurements and whorl counts; x ­ G. clathrata ; O ­ G. adusta ; + ­ G. lutaria .

R

Departamento de Geologia, Universidad de Chile

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Bithyniidae

Genus

Gabbia

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