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Burdikinia burdekinensis
Taxonomy
Polyamma burdekinensis was named by Etheridge (1917). Its type specimen is GSQF926, a shell, and it is a 3D body fossil. Its type locality is Burdekin River near Big Bend, N of Charters Towers, which is in a Givetian marine limestone in the Burdekin Limestone Formation of Australia.
It was recombined as Burdikinia burdikinensis by Knight (1941); it was recombined as Burdikinia burdekinensis by Knight (1937), Heidecker (1959), Cook (1995), Cook (1997) and Wagner (2023).
It was recombined as Burdikinia burdikinensis by Knight (1941); it was recombined as Burdikinia burdekinensis by Knight (1937), Heidecker (1959), Cook (1995), Cook (1997) and Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1917 | Polyamma burdekinensis Etheridge |
| 1937 | Burdikinia burdekinensis Knight |
| 1941 | Burdikinia burdikinensis Knight pp. 63 - 64 figs. Plate 57, figures 3a-b |
| 1959 | Burdikinia burdekinensis Heidecker pp. 5 - 6 figs. pl. 2 f. 2; pl. 3 f. 3a-b |
| 1995 | Burdikinia burdekinensis Cook p. 433 |
| 1997 | Burdikinia burdekinensis Cook p. 52 figs. 1 a-c |
| 2023 | Burdikinia burdekinensis Wagner p. 2954 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Burdikinia burdekinensis Etheridge 1917
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | Rather large, very low-spired, discoidal gastropods with a relatively narrow base, seemingly with a row of spines at the rather narrowly subangular periphery and with several revolving rows of nodes on the base; whorl profile nearly horizontal above and slightly concave, with an acutely subangular periphery between the upper surface and the gently convex, rapidly retreating lower part; sutures seemingly protruding; nucleus unknown; bass seemingly gently arched, probably but not certainly phaneromphalous; columellar and parietal lip unknown; outer lip unknown except that the periphery bears a row of sharp circular elevations that seem to be the bases of spines that probably arose periodically as hollow tubes open on the anterior face in continuation with the aperture at the acutely angular margin of the peripheral angle; ornamentation, other than the supposed peripheral spine bases which show at the sutures of the earlier whorls, four rather strong revolving costae on the lower part of the shell, the uppermost clearly and the next below obscurely broken up into revolving rows o f more or less elongate nodes; shell thickness and structure unknown. The holotype measures about 30 mm. in height, 60 mm. in width, and seemingly has a pleural angle of about 130 degrees. | |
| A. G. Cook 1997 | Growth lines are fine and numerous; prosocline from the uppermost and peripheral spiral cord, strongly recurved about the base towards the axis; these lines are uninterrupted across the lower whorl surface. The weak sinus is located on the upper whorl face regarded here as a subsutural ramp. The nodes on the spiral cords are solid (as noted by Heidecker) in deference to Knight et al. (1960). |
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class | |||||
| References: Kiessling 2004, Wagner 2023 | |||||