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Bransonia australe
Taxonomy
Pleurorhynchus australis was named by M'Coy (1847). It is a 3D body fossil. Its type locality is Wollongong (W.B. Clarke coll), which is in a Wordian marine sandstone in the Gerringong Formation of Australia.
It was recombined as Cardium australe by Dana (1849); it was recombined as Conocardium australe by Fletcher (1943), Waterhouse (1964) and Waterhouse (1980); it was recombined as Bransonia australe by Wagner (2023).
It was recombined as Cardium australe by Dana (1849); it was recombined as Conocardium australe by Fletcher (1943), Waterhouse (1964) and Waterhouse (1980); it was recombined as Bransonia australe by Wagner (2023).
Synonymy list
| Year | Name and author |
|---|---|
| 1847 | Pleurorhynchus australis M'Coy p. 300 figs. pl. 16 f. 4 |
| 1849 | Cardium australe Dana p. 701 figs. pl. 18 f. 2 |
| 1943 | Conocardium australe Fletcher pp. 239 - 240 figs. pl. 14 f. 1, 8-9 |
| 1964 | Conocardium australe Waterhouse pp. 72 |
| 1980 | Conocardium australe Waterhouse figs. 3.5-6; 5.1-3; 6 |
| 2023 | Bransonia australe Wagner p. S3064 |
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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.
†Bransonia australe M'Coy 1847
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. O. Fletcher 1943 | Shell of medium size, length 26 mm., oblique, truncated anteriorly, conical posteriorly. Umbo prominent, situated anteriorly. Hinge-line elongate, straight. Anterior margin straight, nearly perpendicular below the base of the rostrum; inferior margin of median region slightly curved, continuing posteriorly, almost straight but obliquely to the hinge-line which it joins at an angle of about 70˚.
Anterior cordiform slope flattened, ornamented by at least 20 fine radiating ribs, which are divided into three divisions by two furrows originating at the apex of the umbo. Anterior keel curved, fairly prominent, not reaching the lowest portion of the shell. The median region is narrow, inflated and oblique, ornamented by four to five ribs with wide interspaces. The posterior slope of the valve is inflated and conve;x:,. becoming flattened at the conical aliform posterior extremity. A wide, shallow sinus separates the two portions. The convex portion is ornamented by 12-14 fine ribs of uniform size, closely packed, originating from behind the umbo. The fiattened extremity, slightly rolled, or convex, possesses nine broad, flattened ribs, with narrow interspaces, which arise from the hinge-margin. The whole surface is covered with fine concentric lines of growth which give the shell a cancellate appearance. |