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Hippocardia mundulum
Taxonomy
Conocardium mundulum was named by Fletcher (1943). It is not extant. Its type specimen is F.30189. Its type locality is Lake Bathurst Railway Station, 20 miles south of Goulburn, which is in an Emsian carbonate limestone in the Bongalaby Formation of Australia.
It was recombined as Hippocardia mundulum by Tassell (1982) and Wagner (2023).
It was recombined as Hippocardia mundulum by Tassell (1982) and Wagner (2023).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1943 | Conocardium abscissum Fletcher |
| 1943 | Conocardium laseroni Fletcher |
| 1943 | Conocardium mundulum Fletcher pp. 235 - 236 figs. pl. 13 f. 7-9 |
| 1943 | Conocardium abscissum Fletcher p. 237 figs. pl. 13 f. 10 |
| 1943 | Conocardium laseroni Fletcher pp. 237 - 238 figs. pl. 13 f. 11-13 |
| 1982 | Hippocardia mundulum Tassell pp. 8 - 10 figs. pl. 2 f. 4-7 |
| 2023 | Hippocardia mundulum Wagner p. 2937 |
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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.
†Hippocardia mundulum Fletcher 1943
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Invalid names: Hippocardia abscissum Fletcher 1943 [synonym], Hippocardia laseroni Fletcher 1943 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. O. Fletcher 1943 | Shell small, equivalve, inflated, truncated anteriorly and conically depressed posteriorly. The long tubular rostrum on the truncated surface not preserved.
Umbo prominent, recurved anteriorly. Hinge-line long, straight, slightly arched posteriorly, sunk below the dorsal margin. Anterior margin produced to form the rostrum above, straight but extending forward below and meeting the curved basal margin of the median region at about two-thirds the depth of the shell. Posterior margin oblique, straight and meeting the hinge-margin at an acute angle. Anterior cordiform slope elongated and narrow; concave between the base of the rostrum and the anterior keel, less so between the anterior margin and the keeL Ornamented by five gradually increasing rounded ribs, of which the outer two are shortened by the anterior keel. Anterior keel prominent, curved and does not nearly reach the lowest point of the shell. Median region inflated, narrow and convex, ornamented by five coarse, faintly lamellated, sub-angular radiating ribs, separated by interspaces equal to them in width. The ribs originate at the apex of the umbo and radiate forward and downward to the ventral margin so that the base of the last rib is anterior to the umbo. A small fine rib is interpolated between the anterior keel a:nd the first coarse rib. The posterior slope inclines rapidly from the median region, becoming more or less flattened at the gaping, conical aliform protuberance. The surface is ornamented by at least seventeen radiating ribs, fine on the posterior slope and increasing in size towards the extremity. The interspaces between the ribs are marked by lamellose concentric striae or growth lines. |