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Niveria dimidiata
Taxonomy
Cypraea dimidiata was named by Bronn (1831).
It was recombined as Trivia dimidiata by Sacco (1894) and Schilder (1932); it was recombined as Trivia (Trivirostra) dimidiata by Schilder (1925); it was recombined as Trivia (Sulcotrivia) dimidiata by Schilder and Schilder (1971); it was recombined as Niveria dimidiata by Fehse and Landau (2002).
It was recombined as Trivia dimidiata by Sacco (1894) and Schilder (1932); it was recombined as Trivia (Trivirostra) dimidiata by Schilder (1925); it was recombined as Trivia (Sulcotrivia) dimidiata by Schilder and Schilder (1971); it was recombined as Niveria dimidiata by Fehse and Landau (2002).
Synonymy list
| Year | Name and author |
|---|---|
| 1831 | Cypraea dimidiata Bronn p. 16 |
| 1894 | Trivia dimidiata Sacco p. 53 figs. pl. 3, fig. 46 |
| 1925 | Trivia (Trivirostra) dimidiata Schilder p. 63 |
| 1932 | Trivia dimidiata Schilder p. 105 |
| 1971 | Trivia (Sulcotrivia) dimidiata Schilder and Schilder p. 18 |
| 2002 | Niveria dimidiata Fehse and Landau pp. 96 - 97 figs. 2/3 a-c |
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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.
†Niveria dimidiata Bronn 1831
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. Fehse and B. Landau 2002 | Shell medium sized, relatively solid and elongated oval. Spire covered by callus. Body whorl elongated- globose and rounded, almost 100% of total height. The terminals are weakly produced, especially the posterior terminal and rounded. Dorsum rounded, completely covered by 26-36 strong ribs. A dorsal sulcus, of variable strength, extends longitudinally across the centre of the dorsum, in the majority of specimens bisecting most of the ribs, the latter becoming thickened adjacent to the furrow. Base slightly convex, with the terminals recurved. The aperture is relatively narrow in the posterior portion and curved adapically, wider in the anterior part. Outer lip somewhat broadened, convex, widest in mid-portion, becoming narrower towards the terminals and regularly rounded. Outer margin weakly angularly callused. The lip bears 19-24 strong, equal teeth. Siphonal and anal canals are slightly protruding. Columella convex, tapering steeply inwards, bordered internally by a weak carinal ridge. Columella bearing 18-21 ribs, which continue onto the carinal ridge. Fossula broadly concave and delimitedfrom the rest of the columella.
Range of variation — The characteristic features of this species are the elongated shape, the low profile and the dorsal sulcus, which bisects most of the ribs. The number of ribs and width are somewhat variable. The strength of the sulcus is also variable, but always present extending the whole length of the dorsum. The outer lip is not very broad in comparison with other congeners and usually only weakly callused. A number of specimens are smaller, slightly more globose and the dorsal sulcus depresses rather than bisects most of the ribs. The other shell characteristics are similar to those of the typical form. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Kiessling 2004, Hendy et al. 2009 | |||||
Age range: base of the Zanclean to the top of the Piacenzian or 5.33300 to 2.58800 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Zanclean | Spain | Niveria dimidiata (80564 178254) | |
| Piacenzian | Spain | Niveria dimidiata (80562) |