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Sphenodiscus lobatus
Taxonomy
Ammonites lobata was named by Tuomey (1856) [DISTRIBUTION: Maastrichtian; Atlantic and Gulf Coastal Plain.]. It is not a trace fossil.
It was synonymized subjectively with Ammonites lenticularis by Kennedy (1986); it was recombined as Sphenodiscus lobatus by Hyatt (1903), Reyment (1955), Zaborski (1982), Zaborski (1985), Al-Harithi and Ibrahim (1992), Kennedy and Cobban (1996), Kennedy et al. (1997) and Moneer et al. (2021).
It was synonymized subjectively with Ammonites lenticularis by Kennedy (1986); it was recombined as Sphenodiscus lobatus by Hyatt (1903), Reyment (1955), Zaborski (1982), Zaborski (1985), Al-Harithi and Ibrahim (1992), Kennedy and Cobban (1996), Kennedy et al. (1997) and Moneer et al. (2021).
Synonyms
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Synonymy list
Year | Name and author |
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1852 | Ammonites lenticularis Owen p. 579 |
1856 | Ammonites lobata Tuomey p. 579 figs. pl. 8, fig. 5 |
1903 | Sphenodiscus lobatus Hyatt p. 66 figs. Pl. Vi, figs. 1, 2; Pl. VII, figs. 1, 2,; Pl. IX, figs. 11 - 13 |
1903 | Sphenodiscus lenticularis Hyatt pp. 71 - 72 figs. Pl. VIII, figs. 1, 2; Pl. IX, figs. 1 - 6 |
1928 | Sphenodiscus lenticularis Böse p. 293 |
1955 | Sphenodiscus lobatus Reyment p. 87 figs. Pl 22, figs 1a,b; text-fig 44 |
1982 | Sphenodiscus lobatus Zaborski p. 316 figs. 21, 24, 25 |
1985 | Sphenodiscus lobatus Zaborski p. 57 figs. 63-65 |
1986 | Sphenodiscus lenticularis Kennedy p. 176 |
1992 | Sphenodiscus lobatus Al-Harithi and Ibrahim p. 432 figs. Pl 1, fig 2; pl 2, fig 4 |
1996 | Sphenodiscus lobatus Kennedy and Cobban p. 802 figs. 2.4-2.6, 2.13, 2.14, 2.19-2.21 |
1997 | Sphenodiscus lobatus Kennedy et al. p. 4 |
2021 | Sphenodiscus lobatus Moneer et al. p. 3535 figs. 7A1, A2 |
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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.
†Sphenodiscus lobatus Tuomey 1856
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†Sphenodiscus lenticularis splendens Hyatt 1903
Invalid names: Ammonites lenticularis Owen 1852 [replaced]
Diagnosis
No diagnoses are available
Measurements
part | N | mean | minimum | maximum | median | s.d. | |
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shell height | 6 | 58.4 | 31.4 | 75.4 | 66.7 | 15.8 | |
shell diameter | 6 | 104.7 | 51.8 | 140.0 | 120.3 | 31.1 | |
shell inflation | 6 | 4.36 | 2.30 | 8.90 | 3.95 | 2.59 |
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Source: o = order, c = class | |||||
References: Kiessling 2004, Kiessling 2003 |
Age range: base of the Maastrichtian to the top of the Early/Lower Maastrichtian or 72.10000 to 66.00000 Ma
Collections (37 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Late/Upper Campanian | Nigeria (Enugu) | Sphenodiscus lobatus (82733) | |
Late/Upper Campanian | Nigeria | Sphenodiscus lobatus (69626) | |
Maastrichtian | Mexico (Coahuila) | Sphenodiscus lenticularis (51546) | |
Maastrichtian | Jordan | Sphenodiscus lobatus (166341 166342 166343) | |
Maastrichtian | USA (Texas) | Sphenodiscus lenticularis (4535 4553 4627) | |
Maastrichtian | USA (Mississippi) | Sphenodiscus lobatus (7606) | |
Early/Lower Maastrichtian | USA (Alabama) | Sphenodiscus lobatus (4255) | |
Early/Lower Maastrichtian | Mexico (Coahuila de Zaragoza) | Sphenodiscus lenticularis (88243) | |
Early/Lower Maastrichtian | Nigeria | Sphenodiscus lobatus (69625) | |
Early/Lower Maastrichtian | USA (Maryland) | Sphenodiscus lenticularis (125950) | |
Early/Lower Maastrichtian | USA (Wyoming) | Sphenodiscus lenticularis (1575) | |
Early/Lower Maastrichtian | USA (Mississippi) | Sphenodiscus lenticularis (4105 4118) | |
Early/Lower Maastrichtian | Mexico (Nuevo Leon) | Sphenodiscus lenticularis (88241 88242) | |
Early/Lower Maastrichtian | Egypt | Sphenodiscus lobatus (224160 224161) | |
Early/Lower Maastrichtian | USA (New Jersey) | Sphenodiscus lobatus (83067) | |
Late/Upper Maastrichtian | USA (Missouri) | Sphenodiscus lobatus (205794) | |
Late/Upper Maastrichtian | USA (Mississippi) | Sphenodiscus lenticularis (4127 4164) Sphenodiscus lobatus (205793) | |
Late/Upper Maastrichtian | USA (New Jersey) | Sphenodiscus lobatus (4377 178550) | |
Late/Upper Maastrichtian | USA (South Carolina) | Sphenodiscus lobatus (152080) | |
Late/Upper Maastrichtian | USA (Maryland) | Sphenodiscus lobatus (4366 82399 82400 82403 82408) | |
Late/Upper Maastrichtian | USA (South Dakota) | Sphenodiscus lenticularis (88511) | |
Late/Upper Maastrichtian | USA (Texas) | Sphenodiscus lenticularis (4536) | |
Late/Upper Maastrichtian - Early/Lower Paleocene | USA (New Jersey) | Sphenodiscus lobatus (26819) |