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Ptychoglyptus pauciradiatus
Taxonomy
Ptychoglyptus pauciradiatus was named by Reed (1932).
Synonymy list
| Year | Name and author |
|---|---|
| 1932 | Ptychoglyptus pauciradiatus Reed pp. 122– 123 figs. pl. XVIII, figs 1, 2. |
| 2012 | Ptychoglyptus pauciradiatus Rasmussen et al. pp. 21 - 23 figs. Plate 3, figures 16–19 |
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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.
†Ptychoglyptus pauciradiatus Reed 1932
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. M. O. Rasmussen et al. 2012 | Shell medium sized, equibiconvex, transversely semi-oval in outline. Maximum width at hinge-line. Acute cardinal angles. Anterior commissure rectimarginate. Ventral valve weakly convex, with a low, wide, strongly apsacline interarea. Small apical pseudodeltidium and apical foramen present in some specimens. Dorsal valve flat, but weakly concave posteromedianly. Interarea flat, low, wide and orthocline. Chilidium closed by chilidial plates. Ornamentation consists of distinctive, small, closely spaced rugae, interrupted by closely spaced weak costellae and up to sevenmore distinctive costae.
Ventral interior with small teeth supported by short recessive, widely divergent dental plates. Ventral muscle field weakly impressed, but probably bilobed. Median septum lacking, but elevated area bisects the muscle field. Dorsal interior with a cardinal process that may be undercut, however, this is uncertain due to the preservational state of the specimens. Socket ridges long and wide. Median septum with 2 or 3 narrow- angled side septa present. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Hendy 2009, Aberhan et al. 2004 | |||||
Age range: Burrellian or 456.60000 to 452.50000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ashbyan | USA (Alaska) | Ptychoglyptus pauciradiatus (164853) | |
| Burrellian | United Kingdom (Scotland) | Ptychoglyptus pauciradiatus (78001) |