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Dinorthis meedsi
Taxonomy
Orthis meedsi was named by Winchell and Schuchert (1892).
It was recombined as Dinorthis (Plaesiomys) meedsi by Schuchert and Cooper (1932); it was recombined as Plaesiomys meedsi by Jin and Norford (1996); it was recombined as Dinorthis meedsi by Schuchert (1897), Schuchert (1897), Wright and Stigall (2013).
It was recombined as Dinorthis (Plaesiomys) meedsi by Schuchert and Cooper (1932); it was recombined as Plaesiomys meedsi by Jin and Norford (1996); it was recombined as Dinorthis meedsi by Schuchert (1897), Schuchert (1897), Wright and Stigall (2013).
Subspecies
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1892 | Orthis meedsi Winchell and Schuchert p. 289 |
| 1897 | Dinorthis meedsi Schuchert p. 215 |
| 1932 | Dinorthis (Plaesiomys) meedsi Schuchert and Cooper p. 94 |
| 1996 | Plaesiomys meedsi Jin and Norford pp. 25 - 26 figs. Plate 2, figures 8-15 |
| 2013 | Dinorthis meedsi Wright and Stigall p. 1113 |
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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.
†Dinorthis meedsi Winchell and Schuchert 1892
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†Dinorthis meedsi arctica Schuchert 1900
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Jin and B. S. Norford 1996 | Shell small tomedium-sized, subquadrate, nearly equibiconvex;hingeline straight, extending for about four-fifths ofshell width; anterior commissure rectimarginate orweakly sulcate. Ventral umbo small, low, barelyextending posteriorly beyond hingeline, with minutebeak; interarea well developed, about 1 mm high, aswide as hingeline, nearly catacline; delthyrium wide,open; valve with greatest convexity in umbonal area,but without carina, fold, or sulcus. Dorsal umbo flat,with minute median furrow developed anteriorly intoshallow, poorly delimited sulcus; inter area low,orthocline. Entire shell covered by rounded costae,with bifurcation mainly on ventral valve andintercalation on dorsal valve (Pl. 2, figs. 12, 8,respectively), reaching about 7 in 5 mm at anteriormargin. |
Measurements
No measurements are available
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| Source: g = genus, c = class, p = phylum, uc = unranked clade | |||||
| References: Hendy et al. 2009, Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Collections (29 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Turinian | Canada (Ontario) | Dinorthis meedsi (26191 184970) | |
| Turinian | Canada (British Columbia) | Plaesiomys meedsi (35426 192177 192181 192182 192184) | |
| Kirkfieldian | USA (Illinois, Iowa) | Plaesiomys meedsi (23797 23798) | |
| Rocklandian | USA (Minnesota) | Plaesiomys meedsi (219962) | |
| Rocklandian - Shermanian | USA (Minnesota) | Plaesiomys meedsi (23277 23290) | |
| Shermanian | USA (Minnesota) | Plaesiomys meedsi (23278 23279) | |
| Shermanian | USA (Illinois, Iowa) | Plaesiomys meedsi (23799 23800 23801 23803 23804 23805 23806) | |
| Chatfieldian | Canada (Ontario) | Dinorthis meedsi (26263 185002 185268) | |
| Edenian | USA (Minnesota) | Plaesiomys meedsi (23280) | |
| Edenian | USA (Illinois, Iowa) | Plaesiomys meedsi (23807) | |
| Edenian - Maysvillian | USA (Minnesota) | Plaesiomys meedsi (23282) | |
| Edenian - Maysvillian | Canada (Ontario) | Dinorthis meedsi (26293) | |
| Edenian - Maysvillian | Canada (Nunavut) | Plaesiomys meedsi (24120) |