Monograph of the Australian Bithyniidae (Caenogastropoda: Rissooidea)
Ponder, Winston F.
Zootaxa
2003
2003-07-04
230
1
1
126
6K5G8
Ponder, 2003
Ponder
2003
[264,483,1644,1670]
Gastropoda
Bithyniidae
Gabbia
Animalia
Littorinimorpha
30
31
Mollusca
species
campicola
sp. nov.
Etymology Campus Latin field, plain. cola Latin dweller, inhabitant. Type material 5.5 kmS of turnoff to Thornwood HS, NE of Nyngan, NW of Warrenon road to Carinda, NSW, 31° 3.500'S, 147° 29.100'E, amongst sedges and macrophytes, 16 SEP 1996, W.F.Ponder& A.Kornuishin( HolotypeAMS C.417664, paratypesAMS C.332829, 110 wet, 5 dry 3 on SEM stubs; QM 71719, 5; NTM P21380, 4). Additional material examined Queensland: Red Falls, on Lolworth R 19° 56.000'S, 145° 44.000'E, basalt wall, AUG 1981, F.S.Colliver( QM MO13176, 6); on road between Nebo& Mackay, 21° 23.550'S, 148° 56.330'E, in mud on edges of swamp, 12 SEP 2000, W.F.& J.M.Ponder( AMSC.386131, 1); 20 kmS of Funnel Ck, S of Sarina, 21° 35.000'S, 149° 12.000'E, brigalow scrub, mud under leaves in deep depressions, 28 MAY 1977, I.Loch, P.Colman& R. Creese( AMSC.307898, 20+); Nebo, Ca. 30 kmSW at Mt Flora Stn, 21° 53.083'S, 148° 35.417'E, Eucalyptwoodland/brigalow on ground, 23 JUL 1994, J.Stanisic, D.Potter, G.Ingram& C.Eddie( QM MO54307, 7); DipperuNP, S of Nebo, 21° 56.000'S, 148° 42.000'E, SEP 1971, Baldwin( QM MO26515, 1); Western R, 0.2 kmS of Winton, 22° 23.000'S, 143° 2.000'E, on weeds in channels, AUG 1983, G.Knight( QM MO57226, 2; QM MO57223, 4); 0.2 kmS of Winton on Jundah Rd, 22° 23.550'S, 143° 2.460'E, mud along edge of bore drain, 20 JUN 1996, W.F.Ponder& D.L. Beechey( AMSC.327895, 8); SW of Barcaldine, 7 kmE of Landsborough Hwy, rd to Rosemont, 23° 49.500'S, 145° 22.000'E, in bore fed ck at roadside, 27 SEP 1984, W.F.Ponder& P.H.Colman( AMSC.308009, 13); Cluny, 24° 32.000'S, 139° 37.000'E, from flood plain, 25 AUG 1978, B. R. Jahnke( QM MO57227, 5); Retreat Stn, 25° 12.000'S, 143° 16.000'E, temporary water in paddock, 30 MAR 1982, B.J.Smith( MV F 54869, 19); between Cunnamullaand Charleville, 28° 1.130'S, 145° 44.930'E, in mud in water, 17 JUN 1996, W.F.Ponder& D.L.Beechey( AMSC.318702, 20+; AMS C.351062, 2; AMS C.347629, 2); W of Euloon S side of road, 28° 8.750'S, 144° 57.000'E, 04 SEP 1984, W.F.Ponder& P.H. Colman( AMSC.307893, 25); spring at Tunga Borenear Mt Tungaca 43 kmWSW of Eulo, 28° 13.000'S, 144° 38.000'E, in boulder strewn creek, 06 SEP 1984, W.F.Ponder& P.H.Colman( AMSC.308010, 20+); Binya Stn, 70 milesS of Cunnamulla, 29° 4.000'S, 145° 41.000'E, in ditch from bore, 05 DEC 1980, C. Roper( AMSC.307882, 15); Boreno.1, Binyabore drain, Binya Sheep Stn, 29° 4.000'S, 145° 41.000'E, 05 DEC 1980, C. Roper( USNM 803665, many; C.344345); 3.5 milesN of bore no. 1, Binya Sheep Stn, 29° 4.000'S, 145° 41.000'E, 07 DEC 1980, C. Roper( USNM 803667, 5).
New South Wales:MoppinAveymore Rd, ca. 400mS of junctn at Dolgelly Bore, 28° 53.433'S, 149° 51.500'E, 29 NOV 1999, L.Wilkie, R. Harris& T.Moulds( AMSC.417764, 1); Boxflatnear Brindingabba Ck N.of Bindra Stn, NW of Bourke, 29° 2.611'S, 144° 49.571'E, 20 MAY 1994, P.H.Colman& J.Kelly( AMSC.303294, 2); NW of Bourke, Bloodwood Stn, via Yantabulla, 29° 32.000'S, 144° 55.000'E, pool ( AMSC.203379, 20+); Bloodwood Stn, Bells Ck, lower Crescent Pool, 29° 33.000'S, 144° 52.000'E, 01 MAR 1998, B.Timms( AMSC.346352, 20+); Bullaroon Stn., off MitchellH'way N. of Bourke, 29° 40.632'S, 146° 9.476'E, black soil floodplain, 19 MAY 1995, P.H.Colman& J.Kelly( AMSC.305358, 20+); Merah North, small pool in small stream gully on E side of village, 30° 12.000'S, 149° 18.000'E, on surface of mud amongst sedges etc., 17 SEP 1996, W.F.Ponder& A.Kornuishin( AMSC.327926, 20+). Description (based on typematerial only, other than anatomy) Shell ( Figs 2GK, 3FI, 13A,B) moderately large (up to 8.3 mmin length), ovateconic to conic, of up to about 5 convex whorls. Protoconch of about 1.5 smooth whorls. Teleoconch sculptured with fine collabral growth lines and extremely minute, irregular spirally orientated, short wrinkles (visible only with SEM); base evenly convex; umbilicus usually closed (represented by small chink), sometimes perforate and very small. Aperture broadly ovate; peristome weakly thickened on inner lip, outer lip slightly thickened within in adults, prosocline. Colour: shell opaque to transparent, periostracum thin, yellowbrown, edge of outer lip dark brown. Dimensions. See Table 3for dimensions of holotypeand figured paratypeand Appendix, Table 29, for summary shell dimensions and whorl counts. TABLE 3.Dimensions of holotype and figured paratype of Gabbia campicola. Length Width Aperture length Aperture width Length of last whorl Number of whorls Holotype 6.73 4.94 3.39 3.02 5.39 4.9 Figured Paratype 7.53 5.25 3.99 3.29 5.87 5 Operculum ( Fig. 4GI) typical of genus. Ovate, semitranslucent white, concentric growth ridges distinct; inner surface sculptured with small, closelyspaced pustules. Radula (Appendix Table 30; Fig. 11AG; 16B,C) typical of genus. Central teeth with 4 (5) cusps on either side of median cusp which is about equal in length to lightly longer than adjacent cusps and its base is about as wide to slightly wider; median cusp triangular to short fingershaped. Face of central tooth with 34 pairs of cusps that extend just inside lateral margin forming short denticulate ridge, inner pair much larger than others, sharp, rather small (about 0.14 total height of tooth); lateral margins strongly concave, upper part at about 7075º, lower part at about 5055º; basal tongue long, narrow, bluntly pointed. Lateral teeth with cusp formula 34+1+45; with cutting edge about 0.360.40 length of lateral part of tooth; median cusp up to about twice as long as adjacent cusps, tapering and pointed; upper edge of lateral part of tooth at about 6070º to cutting edge, lateral edge concave. Inner marginal teeth with 1620 cusps, outer marginals with 912 cusps. FIGURE 10. A Plot of the shell width/shell length (SWSH) against length/number of teleoconch whorls (SHTW) for two geographic sets of samples of G. vertiginosa. x – Sydney area; O – New England area. B D Plots of the canonical scores obtained from a discriminant function analysis using all shell measurements and whorl counts. B, x – G. iredalei; O – G. campicola; + G. vertiginosa. C, x – G. aff. vertiginosa; O – G. campicola; + G. iredalei; G. aff. iredalei; G. vertiginosa. D, x – G. davisi; O – G. campicola; + G. fontana; G. pallidula; G. rotunda; G. cf. rotunda. Headfoot with snout and bases of tentacles usually weakly to strongly pigmented pale to dark grey; tentacles, if pigmented, grey with unpigmented edges and 12 narrow dark longitudinal lines or unpigmented with median grey line. Foot and opercular lobes unpigmented to grey. Mantle roof dark to pale grey, rarely unpigmented, mottled with white spots. Visceral coil sometimes black dorsally. FIGURE 11.Radulae: A – G, Gabbia campicola, A, F, G, paratype, AMS, C.332829, B, C, MV, F.54869, D, E, AMS, C.344345; H, I, Gabbia kendricki, WAM, AMS, C.203378; A, B, half rows of teeth, C, D, F, H, central teeth, E, G, I, lateral teeth; Scales: 20 m. Anatomy. Gill with apices at or very near right edge except at anterior third where they are at fifth to third gill width from right; 5075 filaments (n=5). Osphradium opposite middle of gill to slightly anterior to middle. Penis ( Fig. 7A, D) with accessory lobe shorter than penial lobe to subequal, with distal swelling; accessory gland short to medium length. Pallial oviduct similar to G. vertiginosabut with very narrow (less than a quarter of height of capsule gland), lateroventrally located bursa copulatrix (AMS C.332829, AMS C.327926, USNM 803665). Distribution ( Fig. 9) and habitat. North western New South Walesand western Queenslandsouth of 19º. A few lots from coastal Queenslandin the vicinity of Mackay are also (somewhat tentatively) assigned to this species. Found in temporary swamps, pools and similar habitats on mud or clay. Remarks This species is found in western parts of northern NSW and in western Queensland. It is characterised by the shell being moderately large, rather thinshelled with a straightsided spire and in having a mottled (black and white) roof to the mantle cavity. This species is similar to G. iredaleibut differs in radular characters. The central teeth of G. campicolahave sharper cusps and a shorter pair of inner basal cusps (occupying less than 0.2 of the tooth height compared with about 0.5) and fewer (23 compared with 45) and relatively weaker subsidiary basal cusps, and the lateral edges are typically more strongly concave (although straight to weakly concave in USNM, 803665). Bythinia vertiginosais also very similar but differs from G. campicolain having a more globose shell and the central and lateral teeth of the radula usually have straight lateral margins. Nevertheless, specimens of the two taxa are often difficult to place using shell characters alone and there is an apparent gradation in shell characters between the two taxa on the western slopes of the Great Divide in the New Englandarea but the radula characters clearly place this material in G. vertiginosa(see above). The penis in G. campicolahas a shorter accessory gland than in G. vertiginosa, although it is rather variable in length ( Fig. 7A,Dcompared with 7I,J). In addition, G. campicoladiffers in having a much more weakly pigmented headfoot and, although the mantle roof is usually mottled, it is often not as darkly pigmented as in G. vertiginosa. The description is based on the typematerial only owing to uncertainty of the allocation to this taxon of some of the material attributed to it. For example, a small lot from Retreat Station in western Queensland(MV F.54869) has more distinct spiral microsculpture but is otherwise similar (including the radula). Some specimens (typified by AMS C.318702) have some differences in the central teeth of the radula to the typematerial of G. campicolaincluding: basal tongue more triangular and sharper; cutting edge more triangular and much more strongly concave on its dorsal margin; basal denticles stronger; and lateral edges only weakly convex to almost straight. They agree in having a pustulate inner side to their operculum. Their shells also lack any distinctive features that separate this material from typical G. campicolaand they are here tentatively considered to represent the same speciesgroup taxon. Similar radular features to those seen in AMS C.318702 are seen in specimens from Binya Stn and vicinity (AMS C.307882; USNM 803665, 803667), although the basal denticles are more similar to those in the typical material. In addition the median cusps of the central and lateral teeth are about twice as long as the cusps on either side. These have a mottled mantle and a similar shaped shell to G. campicolabut it has distinct axial colour lines that are especially noticeable in juveniles, and traces of spiral sculpture are present. The above samples are otherwise not able to be readily differentiated morphologically from G. campicolaand are here also treated as varieties of that taxon. The two species appear to abut in their range west of the New Englandarea (see Fig. 9). Further studies are needed to clarify the detail of the distribution of these taxa in this area and whether or not they are always allopatric. Specimens from the Murray R drainage in the vicinity of Kerang, Victoria( 10 kmW of Kerang, VIC, 35° 44.000'S, 143° 52.000'E, standing water on side of road, 27 AUG 1976, B.J.Smith [MV F 54838, 11]; Leaghur Forest, 20 kmSW of Kerang, VIC, 35° 58.000'S, 143° 46.000'E, 24 MAY 1975, J.McVicar & J.Gilmore [MV F 78762, 2]), have a similar shell that is somewhat intermediate between G. vertiginosaand G. campicola.A single empty shell, also from the MurrayDarling drainage, from the Gwydir R, below Moree ( 29° 25.000'S, 149° 50.000'E, 12 APR 1992[Murray Darling F/W R.C.]), is also similar to the Kerang material and has traces of spiral sculpture. There is insufficient material to determine whether or not these specimens represent one or two distinct taxa and they are tentatively referred to as G. aff. vertiginosa. A discriminant function analysis using the shell dimensions and the number of whorls of the measured samples ( Table 4; Figs 10B) showed that 89% of G. iredaleiand 83% of G. vertiginosawere correctly identified with only 35% of G. campicolaspecimens being incorrectly placed in both the other two species. When the forms from Victoriaand eastern South Australiaare included, the results are even less clear cut ( Table 5; Fig. 10C). The difficulty in the assignment of G. campicolareflects the considerable variation in shell morphology in what is considered here to be a single taxon. Given this variation and the considerable geographic range, further analysis involving molecular data may possibly reveal greater taxonomic diversity than recognised here.
3321535414
P21380
1996-09-16
HS
W. F. Ponder & A. Kornuishin
31
32
-31.058332
Thornwood
1
147.485
30
31
2
holotype
3321535437
1981-08
R, QM
F. S. Colliver
-19.933332
Lolworth
1
145.73334
Red Falls
31
32
MO13176, 6
1
Queensland
3321535459
2000-09-12
AMS
W. F. & J. M. Ponder
-21.3925
Nebo
1
148.93883
31
32
1
Queensland
3321535535
1977-05-28
R, AMS
I.Loch, P.Colman & R.Creese
-21.583334
Sarina
1
149.2
31
32
1
Queensland
3321535559
1994-07-23
QM
J. Stanisic & D. Potter & G. Ingram & C. Eddie
Nebo
-21.884716
Mt Flora Stn
1
148.59029
Ca.
31
32
MO54307, 7
1
Queensland
3321535305
1971-09
QM
Baldwin
-21.933332
Dipperu
1
148.7
31
32
MO26515, 1
1
Queensland
3321535452
1983-08
R, QM
G. Knight
-22.383333
Western
1
143.03334
31
32
MO57226, 2
1
Queensland
3321535416
1996-06-20
AMS
W. F. Ponder & Beechey
-22.3925
0.2 km S of Winton on Jundah Rd
1
143.041
31
32
1
Queensland
3321535345
1984-09-27
AMS
W. F. Ponder & P. H. Colman
-23.825
Rosemont
1
145.36667
Barcaldine
31
32
1
Queensland
3321535580
1978-08-25
R, QM
Jahnke
-24.533333
Cluny
1
139.61667
31
32
MO57227, 5
1
Queensland
3321535367
F 54869
1982-03-30
MV
B. J. Smith
-25.2
Retreat Stn
1
143.26666
31
32
19
1
Queensland
3321535512
1996-06-17
AMS
W. F. Ponder & D. L. Beechey
-28.018833
Charleville
1
145.74884
Cunnamulla
31
32
1
Queensland
3321535568
1984-09-04
AMS
W. F. Ponder & Colman
-28.145834
W of Eulo
1
144.95
31
32
1
Queensland
3321535424
1984-09-06
AMS
W. F. Ponder & P. H. Colman
-28.216667
Mt Tunga
1
144.63333
Tunga Bore
31
32
1
Queensland
3321535397
1980-12-05
AMS
C. Roper
-29.066668
Binya Stn
1
145.68333
31
32
1
Queensland
3321535431
1980-12-05
USNM
C. Roper
Bore
-29.066668
Binya Sheep Stn
1
145.68333
Binya
31
32
USNM 803665
1
Queensland
3321535518
1980-12-07
USNM
C. Roper
-29.066668
Binya Sheep Stn
1
145.68333
31
32
USNM 803667, 5
1
Queensland
3321535532
1994-05-20
1999-11-29
1994-05-20
R, AMS
L. Wilkie & Harris & T. Moulds
Dolgelly Bore
400
-30.2
Bloodwood Stn
1
149.3
Bourke
31
32
1
New South Wales
3321535321
1994-05-20
1999-11-29
1994-05-20
R, AMS
P.H.Colman & J.Kelly
Dolgelly Bore
400
-30.2
Bloodwood Stn
1
149.3
Bourke
31
32
1
New South Wales
3321535377
1994-05-20
1999-11-29
1994-05-20
R, AMS
Dolgelly Bore
400
-30.2
Bloodwood Stn
1
149.3
Bourke
31
32
1
New South Wales
3321535442
1994-05-20
1999-11-29
1994-05-20
R, AMS
B.Timms
Dolgelly Bore
400
-30.2
Bloodwood Stn
1
149.3
Bourke
31
32
1
New South Wales
3321535450
1994-05-20
1999-11-29
1994-05-20
R, AMS
P.H.Colman & J.Kelly
Dolgelly Bore
400
32
33
-30.2
Bloodwood Stn
1
149.3
Bourke
31
32
1
New South Wales
3321535493
1994-05-20
1999-11-29
1994-05-20
R, AMS
W.F.Ponder & A.Kornuishin
Dolgelly Bore
400
-30.2
Bloodwood Stn
1
149.3
Bourke
32
33
1
New South Wales