Gabbia lutaria, Ponder, 2003
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 |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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