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Lithacoceras ulmensis
Taxonomy
Ammonites ulmensis was named by Oppel (1858).
It was recombined as Lithacoceras ulmensis by Oppel (1858); it was recombined as Lithacoceras (Lithacoceras) ulmensis by Howarth (1998).
It was recombined as Lithacoceras ulmensis by Oppel (1858); it was recombined as Lithacoceras (Lithacoceras) ulmensis by Howarth (1998).
Sister species lacking formal opinion data
Synonymy list
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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.
†Lithacoceras ulmensis Oppel 1858
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Oppel 1858 | Amm. Ulmensis n. sp. is distinguished from the other planulates by the closely spaced ribs which cover the whorls when young but which later disappear. Up to 2-3 inches in diameter, the ribs are at their narrowest, with one of them splitting into two in the middle of each side. With a diameter of 3-6 inches, the ribs that run along the back remain just as numerous, but the side ribs become thicker, especially towards the seam, and at the same time they leave considerable gaps between them. When the specimens finally reach even more significant dimensions of up to 1 foot in diameter and more, the fine ribs on the back disappear completely and only the distant arches remain on the sides, which have taken the place of the earlier ribs. The specimens that were found in the slab limestone of Ulm do not show any lobes; they are also flattened, so that nothing can be said about the shape of the mouth edge. Nevertheless, I wanted to highlight the species because it is very representative of the locality just mentioned and is one of the most common occurrences. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: Early/Lower Tithonian or 150.80000 to 145.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Tithonian | France (Midi-Pyrenees) | Lithacoceras ulmensis (94549) |