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Taxonomy
Monotis alaskana was named by Smith (1927). Its type specimen is USNM 74193, a valve (left valve), and it is a 3D body fossil. Its type locality is USGS 9961, Mill Creek, which is in a Norian marine horizon in the McCarthy Formation of Alaska.
It was recombined as Monotis (Monotis) alaskana by Silberling et al. (1997).
It was recombined as Monotis (Monotis) alaskana by Silberling et al. (1997).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1927 | Monotis alaskana Smith p. 119 figs. Pl 101, figs 1,2 |
| 1997 | Monotis (Monotis) alaskana Silberling et al. pp. 4 - 5 figs. 2Plate 2, figures 1–7; plate 3, figures 4–7, ?14–15; plate 4, figures 6–7 |
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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 (Monotis) alaskana Smith 1927
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| N. J. Silberling et al. 1997 | Medium size M. (Monotis) up to 50 mm long. Postumbonal length up to twice anterior length and 2–3 times length of posterior ear that is truncated posteriorly at 130°+15°. Primary ribs number 30+5; secondary ribs inserted at valve height of about 10 mm, and tertiary ribs, if present, irregularly inserted at valve height of about 25 mm.
Concentric sculpture closely spaced and faint, if visible at all. |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class | |||||
| References: Kiessling 2004, Aberhan et al. 2004 | |||||
Collections (11 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Norian | USA (Nevada) | Monotis alaskana (140026 140027) | |
| Norian | USA (Alaska) | Monotis alaskana (85146 85147 100922 100923 100924 100925 139026 140025) | |
| Sevatian | USA (Alaska) | Monotis alaskana (97814) |