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Schizodus rotundatus
Taxonomy
Axinus rotundatus was named by Brown (1839). It is not a trace fossil. Its type locality is Newtown, River Irk, Bed 8, which is in a Wuchiapingian shallow subtidal packstone in the United Kingdom.
It was synonymized subjectively with Schizodus schlotheimi by Geinitz (1861), Logan (1967); it was synonymized subjectively with Schizodus obscurus by Pattison (1970); it was recombined as Schizodus rotundatus by King (1850), Waagen (1881), Frech (1911), Diener (1915), Riedel (1917), Muromtseva (1981), Muromtseva and Guskov (1984).
It was synonymized subjectively with Schizodus schlotheimi by Geinitz (1861), Logan (1967); it was synonymized subjectively with Schizodus obscurus by Pattison (1970); it was recombined as Schizodus rotundatus by King (1850), Waagen (1881), Frech (1911), Diener (1915), Riedel (1917), Muromtseva (1981), Muromtseva and Guskov (1984).
Sister species lacking formal opinion data
S. sp., S. appressus, S. axiniformis, S. cheveriensis, S. compressus, S. cuneus, S. dilgryensis, S. drpressus, S. elliotti, S. ewaldi, S. fundiensis, S. harii, S. impressus, S. jakovlevi, S. oherni, S. oweni, S. paucus, S. peregrins, S. pindingensis, S. portlocki, S. sedaliensis, S. semistriatus, S. subelegans, S. taiti, S. truemani, S. batesvillensis, S. brannerianus
Synonymy list
| Year | Name and author |
|---|---|
| 1839 | Axinus rotundatus Brown p. 65 figs. Pl 6, fig 29 |
| 1850 | Schizodus rotundatus King p. 190 figs. Pl 15, fig 30 |
| 1881 | Schizodus rotundatus Waagen p. 233 figs. Pl 19, figs 11,12 |
| 1911 | Schizodus rotundatus Frech p. 194 figs. Pl 15, fig 7 |
| 1915 | Schizodus rotundatus Diener p. 63 figs. Pl 6, fig 11 |
| 1917 | Schizodus rotundatus Riedel p. 69 |
| 1981 | Schizodus rotundatus Muromtseva p. 39 figs. Pl 10, figs 6-8 |
| 1984 | Schizodus rotundatus Muromtseva and Guskov p. 81 |
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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.
†Schizodus rotundatus Brown 1839
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Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| valve height | 6 | 17.0 | 7.30 | 42.6 | 16.6 | 12.3 |
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| Source: o = order, c = class | |||||
| Reference: Aberhan et al. 2004 | |||||
Age range: base of the Kungurian to the top of the Changhsingian or 283.30000 to 251.90200 Ma
Collections (19 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Kungurian | Russian Federation | Schizodus rotundatus (109935 110010) | |
| Roadian | Russian Federation | Schizodus rotundatus (87302) | |
| Wuchiapingian | China (Hubei) | Schizodus rotundatus (139300) | |
| Wuchiapingian | Pakistan | Schizodus rotundatus (126895) | |
| Wuchiapingian | Poland | Schizodus rotundatus (208522 208523 208526 208582 208583 208584 208585 208586) | |
| Wuchiapingian | United Kingdom (England) | Axinus rotundatus (type locality: 119886) | |
| Changhsingian | Pakistan | Schizodus rotundatus (89061 90251 119720 126934) | |
| Changhsingian | India | Schizodus rotundatus (230707) |