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Dudresnayiceras
Taxonomy
Dudresnayiceras was named by Rakus (1994).
It was assigned to Ammonitida by Rakús and Guex (2002); to Aequilobidae by Bilotta (2010); and to Polymorphitinae by Howarth (2020).
It was assigned to Ammonitida by Rakús and Guex (2002); to Aequilobidae by Bilotta (2010); and to Polymorphitinae by Howarth (2020).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1994 | Dudresnayiceras Rakus |
| 2002 | Dudresnayiceras Rakús and Guex p. 72 |
| 2010 | Dudresnayiceras Bilotta p. 589 |
| 2020 | Dudresnayiceras Howarth |
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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.
G. †Dudresnayiceras Rakus 1994
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†Dudresnayiceras suessi Hauer 1854
†Dudresnayiceras suessiforme Rakus 1994
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Bilotta 2010 | Compressed platycone form; very evolute and scarcely overlapping inner whorls, evolute outer whorls with oval or elliptic to sub-rectangular whorl section. Rounded and elevated ventral area. The ornamentation is clearly visible both on the test and on the internal mould: it is formed by thin but very strong and well-marked lateral ribs, more or less sigmoidal; they fade crossing the venter, tending to form a
chevron, whereas on the ventro-lateral edge moderatelydeveloped cuneiform tubercle-spines are sometimes visible. The inner whorls have round section, they are smooth or with thin and slightly sigmoidal striae, and sometimes they show a short initial stage characterized by very weak prorsiradiate constrictions. Pseudoceratitic suture line, with monophyllic saddles and denticulate lobe endings; E shifted from the middle of the whorl and slightly longer than L, which has two or three terminal denticles; U2 as large as L or a little less; small but usually non tooth-like U3; LS1 saddle nearly as large as ES, but usually more advanced than this latter; sub-lituid I lobe |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 3 | 6.65 | 6.00 | 7.00 | 7.00 | 0.577 | |
| shell diameter | 3 | 24.4 | 23.8 | 25.5 | 24.0 | 0.929 | |
| shell inflation | 3 | 11.9 | 11.0 | 13.0 | 11.7 | 1.01 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: Late/Upper Sinemurian or 196.50000 to 189.60000 Ma
Collections (23 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Sinemurian | Morocco | D. suessiforme (200474 200507 200508 200509 200511 200512 200522 200583 200585 200586 200587 200592 200594 200599 200600 200601 200603 200604 200613 200615) D. suzannae, D. suessiforme (200505) | |
| Oxynotum | Tunisia | D. suessi (170505) D. suessiforme (170512) |