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Nigericeras
Taxonomy
Nigericeras was named by Schneegans (1943) [Sepkoski's age data: K Ceno-u]. Its type is Acanthoceras gadeni.
It was assigned to Vascoceratidae by Reyment (1954) and Cobban (1972); to Vascoceratinae by Meister (1989), Meister et al. (1992) and Meister et al. (1994); to Ammonoidea by Sepkoski (2002); and to Acanthoceratinae by Wright et al. (1996) and Guendouz et al. (2022).
It was assigned to Vascoceratidae by Reyment (1954) and Cobban (1972); to Vascoceratinae by Meister (1989), Meister et al. (1992) and Meister et al. (1994); to Ammonoidea by Sepkoski (2002); and to Acanthoceratinae by Wright et al. (1996) and Guendouz et al. (2022).
Synonymy list
| Year | Name and author |
|---|---|
| 1943 | Nigericeras Schneegans |
| 1954 | Nigericeras Reyment p. 256 |
| 1972 | Nigericeras Cobban p. 18 |
| 1989 | Nigericeras Meister p. 10 |
| 1992 | Nigericeras Meister et al. p. 67 |
| 1994 | Nigericeras Meister et al. p. 202 |
| 1996 | Nigericeras Wright et al. p. 167 |
| 2002 | Nigericeras Sepkoski |
| 2022 | Nigericeras Guendouz et al. p. 2167 |
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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. †Nigericeras Schneegans 1943
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†Nigericeras gadeni Chudeau 1909
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Invalid names: Nigericeras gignouxi Schneegans 1943 [synonym], Nigericeras lamberti Schneegans 1943 [synonym]
†Nigericeras intermedium Barber 1957
†Nigericeras jacqueti Schneegans 1943
†Nigericeras ogojaense Reyment 1955
†Nigericeras scotti Cobban 1972
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Wright et al. 1996 | Acanthoceratine ornament of ribs and umbilical, inner and outer ventrolateral, and siphonal tubercles persisting to varying diameters up to 40 mm; thereafter, shell smooth except for strong to weak folds, which may be rursiradiate; weak siphonal ridge may be present; whorl section oval, round, or quadrate. Suture simplifying. |
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| shell height | 1 | 35.0 | |||||
| shell diameter | 1 | 64.0 | |||||
| shell inflation | 1 | 10.0 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Late/Upper Cenomanian to the top of the Early/Lower Turonian or 99.60000 to 89.30000 Ma
Collections (30 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Cenomanian | Algeria | N. gadeni (217146 217148) | |
| Late/Upper Cenomanian | Algeria | N. gadeni (227908) | |
| Late/Upper Cenomanian | Niger | N. gadeni (175431 175437 175438 175439 175448) N. gadeni, N. jacqueti (175432 175434 175443) N. jacqueti (175481 175482) | |
| Late/Upper Cenomanian | Nigeria | N. gadeni (175526 175527 175528 175529 175530) N. gadeni, N. jacqueti (175520) N. jacqueti (175533) | |
| Late/Upper Cenomanian | USA (Arizona) | N. ogojaense (55890) | |
| Late/Upper Cenomanian | USA (Colorado) | N. scotti (176990) | |
| Late/Upper Cenomanian - Early/Lower Turonian | USA (New Mexico) | N. sp. (179266) | |
| Late/Upper Cenomanian - Early/Lower Turonian | Nigeria | N. jacqueti (175537) | |
| Early/Lower Turonian | Niger | N. jacqueti (175450 175451 175452 175453) | |
| Early/Lower Turonian | Nigeria | N. intermedium (210100) N. ogojaense (82782) |