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Taxonomy
Monotis subcircularis was named by Gabb (1864).
It was recombined as Pseudomonotis subcircularis by Smith (1904) and Smith (1927); it was recombined as Monotis (Entomonotis) subcircularis by Grant-Mackie (1978); it was recombined as Monotis (Pacimonotis) subcircularis by Silberling et al. (1997), Taylor and Guex (2002) and McRoberts (2011).
It was recombined as Pseudomonotis subcircularis by Smith (1904) and Smith (1927); it was recombined as Monotis (Entomonotis) subcircularis by Grant-Mackie (1978); it was recombined as Monotis (Pacimonotis) subcircularis by Silberling et al. (1997), Taylor and Guex (2002) and McRoberts (2011).
Sister species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1864 | Monotis subcircularis Gabb p. 31 figs. Pl 6, figs 29,29a |
| 1904 | Pseudomonotis subcircularis Smith pp. 407 - 408 figs. Plate XLIX, Figs. 1-3 |
| 1912 | Monotis subcircularis Kittl |
| 1918 | Monotis intermedia Trechmann |
| 1927 | Pseudomonotis subcircularis Smith p. 120 figs. Pl 95, figs 8,9; pl 101, fig 8; pl 104, figs 6,7; pl 106, figs 6,7 |
| 1953 | Monotis gigantea Avias |
| 1966 | Monotis sibirica Bytschkov |
| 1976 | Monotis subcircularis Bychkov et al. |
| 1978 | Monotis (Entomonotis) subcircularis Grant-Mackie |
| 1997 | Monotis (Pacimonotis) subcircularis Silberling et al. |
| 2002 | Monotis (Pacimonotis) subcircularis Taylor and Guex figs. Pl 1, fig 14 |
| 2011 | Monotis (Pacimonotis) subcircularis McRoberts p. 645 |
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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.
†Monotis (Entomonotis) subcircularis Gabb 1864
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Invalid names: Monotis gigantea Avias 1953 [synonym], Monotis intermedia Trechmann 1918 [synonym], Monotis sibirica Bytschkov 1966 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. J. Silberling et al. 1997 | Large (up to 120 mm long) valves of subcircular to suboval outline. Postumbonal length about 1.5 times the anterior length and 2–4 times length of the posterior ear. Posterior angle 120°+10°. Number of primary ribs 15+5; secondary ribs inserted early, at valve heights of 5–15 mm, tertiary ribs at valve heights of 20–30 mm; fourth-order ribs irregularly present on valves larger than 45 mm high. Concentric striae conspicuous. |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class | |||||
| References: Kiessling 2004, Aberhan et al. 2004 | |||||
Collections (43 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Illyrian | USA (Nevada) | Monotis subcircularis (142617) | |
| Carnian | Canada (British columbia) | Monotis subcircularis (43822) | |
| Carnian | USA (Alaska) | Pseudomonotis subcircularis (112276) | |
| Late/Upper Triassic | USA (Alaska) | Pseudomonotis subcircularis (112278 112279 112280 112281 112282) | |
| Norian | Mexico | Monotis subcircularis (131164 131166) | |
| Norian | Russian Federation | Monotis subcircularis (39309 128059) | |
| Norian | Canada (British Columbia) | Monotis subcircularis (43825 43830 43832 199710) | |
| Norian | Russian Federation (Primorskiy Kray) | Monotis subcircularis (97859) | |
| Norian | Peru (Amazonas) | Monotis subcircularis (100242) | |
| Norian | USA (Alaska) | Monotis subcircularis (44438) Pseudomonotis subcircularis (112277 112283) | |
| Norian | Colombia (Tolima) | Monotis subcircularis (101055 101058 101065 101066) | |
| Norian | Bolivia (Chuquisaca) | Monotis subcircularis (203937) | |
| Lacian | Russian Federation | Monotis subcircularis (39313) | |
| Sevatian | USA (Nevada) | Pseudomonotis subcircularis (33379) | |
| Sevatian | Canada (British Columbia) | Monotis subcircularis (47393 47395 47396 47397 47398 47399 47400 47401 100586) | |
| Sevatian | USA (Alaska) | Monotis subcircularis (44442) | |
| Sevatian | Russian Federation | Monotis subcircularis (214912 214913) | |
| Sevatian | USA (California) | Monotis subcircularis (33365) | |
| Warepan | New Zealand | Monotis intermedia (63953) Monotis subcircularis (63954) |