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Anapachydiscus peninsularis
Taxonomy
Parapachydiscus peninsularis was named by Anderson and Hanna (1935). Its type specimen is CAS 1431.07, a shell, and it is a 3D body fossil. Its type locality is CAS 1431, Catarina Landing, which is in a Maastrichtian marine siliciclastic in the Rosario Formation of Mexico.
It was recombined as Anapachydiscus peninsularis by Saul (1979); it was recombined as Menuites peninsularis by Wright et al. (1996).
It was recombined as Anapachydiscus peninsularis by Saul (1979); it was recombined as Menuites peninsularis by Wright et al. (1996).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1935 | Parapachydiscus peninsularis Anderson and Hanna p. 20 figs. Pl 4, fig 1; pl 5, figs 1,2; pl 6, figs 3,4; pl 7, fig 5; text-fig 1 |
| 1958 | Parapachydiscus peninsularis Anderson p. 225 |
| 1979 | Anapachydiscus peninsularis Saul p. 1 |
| 1996 | Menuites peninsularis Wright et al. p. 105 |
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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.
†Anapachydiscus peninsularis Anderson and Hanna 1935
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. M. Anderson and G. D. Hanna 1935 | Shell large, inflated, costate, moderately involute; section of whorl nearly semi- circular in young stages (ratio 1:1.5); at a diameter of 3.25 inches (9 cm.) the ratio of height to width is 1.277.; with increa sing growth the ratio becomes smaller; at
14 in ches (35.5 cm.) the ratio is reduced to 1:0.928; ribs about 56 in number, in two ranks; in she lls 6 in ches ( '15 cm.) in diameter, the ribs alternate; the stronger ribs slightly bullate on the urr.bilical border; ribs scarcely extending across the ventral zone; secondary ribs not bullate, more numerous than the primary, becoming reduccd near the umbilical and ventral borders; walls of umbilicus ab rupt in young shel ls, more rounded in larger individuals; rat io of umbilicus to diameter, varying from .226 in young stages to .222 in shells 14 inches in diameter. |
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| shell height | 1 | 155.0 | |||||
| shell diameter | 1 | 355.0 | |||||
| shell inflation | 1 | 87.0 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Age range: base of the Late/Upper Campanian to the top of the Maastrichtian or 83.60000 to 66.00000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | Mexico (Baja California) | Anapachydiscus peninsularis (233831) | |
| Late/Upper Campanian | USA (California) | Anapachydiscus arrialoorensis (86872 225735) | |
| Late/Upper Campanian - Early/Lower Maastrichtian | USA (California) | Anapachydiscus peninsularis (72054) | |
| Maastrichtian | USA (California) | Parapachydiscus peninsularis (83774) | |
| Maastrichtian | Mexico (Baja California) | Parapachydiscus peninsularis (type locality: 158099) |