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Hypophylloceras (Neophylloceras) hetonaiense
Taxonomy
Neophylloceras hetonaiense was named by Matsumoto (1942). It is a 3D body fossil.
It was recombined as Hypophylloceras (Neophylloceras) hetonaiense by Morozumi (1985) and Salazar et al. (2010).
It was recombined as Hypophylloceras (Neophylloceras) hetonaiense by Morozumi (1985) and Salazar et al. (2010).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1942 | Neophylloceras hetonaiense Matsumoto p. 675 figs. text figs. 1a, b |
| 1953 | Neophylloceras hetonaiense Spath p. 5 figs. Pl 1, fig 2 |
| 1959 | Neophylloceras hetonaiense Matsumoto p. 5 figs. Pl. 3, fig. 1a-d |
| 1963 | Neophylloceras hetonaiense Jones p. 23 |
| 1984 | Neophylloceras hetonaiense Matsumoto p. 11 |
| 1985 | Hypophylloceras (Neophylloceras) hetonaiense Morozumi p. 15 figs. Pl 1, figs 1-5 |
| 2010 | Hypophylloceras (Neophylloceras) hetonaiense Salazar et al. p. 186 figs. 3, 4g-h,k-l |
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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.
†Hypophylloceras (Neophylloceras) hetonaiense Matsumoto 1942
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Matsumoto 1959 | This species is characterized, like Neophylloceras ramosum (MEEK), by great involution, very small umbilicus, much compressed whorls, and densely spaced, fine subcostae. The flank is evenly convex, with the maximum breadth of whorl at its middle, from where it inclines gradually towards umbilicus and also towards the narrowly arched venter. The subcostae incline slightly forward near the umbilicus, gradually change their curvature near the mid一flank and run almost radially on the main part of the whorl, showing less flexuosity than in N. ramosum (MEEK). On the inner half of the inner whorl blunt and short major ribs or bullae may develop, sometimes becoming strong enough to be called tubercles but sometimes very faint. The riblets correspond to the weak furrows on the mould. The suture is of nearly the same type as that of N. ramosum (MEEK). |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 23 | 19.4 | 5.60 | 60.0 | 21.0 | 12.5 | |
| shell diameter | 23 | 33.9 | 10.9 | 105.0 | 35.0 | 22.2 | |
| shell inflation | 23 | 2.51 | 1.30 | 6.00 | 2.30 | 1.15 |
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| Source: s = species, o = order, c = class | |||||
| References: Hendy et al. 2009, Kiessling 2004, Matsumoto 1984, Kiessling 2003 | |||||
Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.50000 to 66.00000 Ma
Collections (26 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Campanian | Antarctica | Neophylloceras hetonaiense (166162) | |
| Campanian | USA (Alaska) | Neophylloceras hetonaiense (88822) | |
| Late/Upper Campanian | Japan | Hypophylloceras hetonaiense (176800) | |
| Late/Upper Campanian | USA (Alaska) | Neophylloceras hetonaiense (64021 64022 88814 88816 88823 158219 158220 158227 158291 158294 158310 158322 158382) | |
| Maastrichtian | USA (California) | Hypophylloceras hetonaiense (185405) Neophylloceras hetonaiense (83778 224990 225709) | |
| Early/Lower Maastrichtian | Japan | Hypophylloceras hetonaiense (176813 176819) | |
| Late/Upper Maastrichtian | Chile | Hypophylloceras hetonaiense (165489 165491 165492 165497) |