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Umbilia (Palliocypraea) gastroplax
Taxonomy
Cypraea gastroplax was named by McCoy (1867). It is extant. Its type specimen is P12140, a shell. Its type locality is PL3078 - Shore platform at Fossil Beach, 3 km South of Mornington, which is in a Miocene marine claystone/marl in the Fyansford Formation of Australia.
It was recombined as Cypraea (Aricia) gastroplax by McCoy (1875); it was recombined as Rhynchocypraea (Palliocypraea) gastroplax by Cossmann (1906); it was recombined as Palliocypraea gastroplax by Chapman (1929); it was recombined as Umbilia (Palliocypraea) gastroplax by Schilder (1935), Darragh (2002).
It was recombined as Cypraea (Aricia) gastroplax by McCoy (1875); it was recombined as Rhynchocypraea (Palliocypraea) gastroplax by Cossmann (1906); it was recombined as Palliocypraea gastroplax by Chapman (1929); it was recombined as Umbilia (Palliocypraea) gastroplax by Schilder (1935), Darragh (2002).
Synonymy list
| Year | Name and author |
|---|---|
| 1867 | Cypraea gastroplax McCoy p. 18 |
| 1875 | Cypraea (Aricia) gastroplax McCoy p. 20 figs. pl. 16 figs 1–1a, pls 17–18 figs 2–2a |
| 1906 | Rhynchocypraea (Palliocypraea) gastroplax Cossmann p. 239 figs. pl. 9 figs 10–11 |
| 1929 | Palliocypraea gastroplax Chapman p. 202–205 figs. pls 19–20 |
| 1935 | Umbilia (Palliocypraea) gastroplax Schilder pp. 342, 345 |
| 2002 | Umbilia (Palliocypraea) gastroplax Darragh pp. 368 - 369 figs. 19D–E; 20A–D; 21A–D |
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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.
Umbilia (Palliocypraea) gastroplax McCoy 1867
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. A. Darragh 2002 | Shell of average size for genus; last whorl pyriform, tapering gently anteriorly with prominent wide flange extending around periphery of whorl; flange width about half width of last whorl, flange thickness about 1 mm. Transverse section of last whorl subtriangular. Spire umbilicate; spire whorls scarcely visible, covered with glaze.
Posterior canal incorporated into shell flange, slightly reflexed dorsally, subcylindrical, almost tubelike anteriorly, almost closed on some specimens, closed on others; weak longitudinal sulcus present on left dorsal side of posterior canal and extending from middle of canal into umbilicus and across dorsum to posterior canal on some specimens. Anterior canal subcylindrical incorporated into shell flange; dorsal surface of canal bearing very weak sulcus. Aperture narrow, sinuous; with 30–39 labial teeth; teeth prominent, thin, short, tooth interspaces about twice width of teeth; inner lip with 24–30 short thin teeth about half width of interspaces; teeth set on narrow rounded ridge running from anterior canal to posterior canal. Fossula elongate, narrow, slightly depressed. Ventral surface on both sides of aperture uniformly convex. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Hendy et al. 2009, Kiessling 2004 | |||||
Age range: base of the Early/Lower Miocene to the top of the Langhian or 23.04000 to 13.82000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Miocene | Australia (Victoria) | Umbilia gastroplax (71241) | |
| Langhian | Australia (Victoria) | Umbilia gastroplax (176299) | |
| Middle Miocene | Australia (Victoria) | Cypraea gastroplax (176003) Palliocypraea gastroplax (71351) Umbilia gastroplax (72201) |