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Schizophoria swallowi
Discussion
Hall (1858) did not choose a holotype specimen and a lectotype has not been subsequently designated. AMNH 32847, a complete dorsal valve limestone matrix is chosen by Stigall-Rode as the lectotype. This specimen was previously figured in Hall’s (1858) original description of the species.
Taxonomy
Schizophoria swallovi was named by Weller (1914) [Hall (1858) did not choose a holotype specimen. Lectotype chosen by Stigall-Rode]. Its type specimen is AMNH 32847, a shell, and it is a mold.
It was recombined as Orthis swallovi by Hall (1858), Hall and Clarke (1892) and Keyes (1894); it was corrected as Schizophoria swallovi by Weller (1914) and Shimer and Shrock (1944); it was corrected as Schizophoria swallowi by Butler et al. (1920); it was recombined as Schizophoria (Schizophoria) swallovi by Stigall Rode (2005) and Butts (2007).
It was recombined as Orthis swallovi by Hall (1858), Hall and Clarke (1892) and Keyes (1894); it was corrected as Schizophoria swallovi by Weller (1914) and Shimer and Shrock (1944); it was corrected as Schizophoria swallowi by Butler et al. (1920); it was recombined as Schizophoria (Schizophoria) swallovi by Stigall Rode (2005) and Butts (2007).
Sister species lacking formal opinion data
S. allani, S. athabaskensis, S. athabaskiensis, S. bisinuata, S. blankenheimensis, S. compacta, S. connivens, S. fascicostella, S. fecunda, S. fossula, S. fragilis, S. latisulcata, S. lianghetangensis, S. mayesensis, S. mcfarlanei, S. multistriata, S. nevadensis, S. protonevadensis, S. runegatensis, S. shubarica, S. similis, S. striatula, S. texana, S. athabaskensis
Synonymy list
| Year | Name and author |
|---|---|
| 1858 | Orthis swallovi Hall p. 597 figs. pl. 12, figs 5a–b. |
| 1892 | Orthis swallovi Hall and Clarke pp. 1-367 figs. pl.6, figs. 23-24 |
| 1894 | Orthis swallovi Keyes p. 63 figs. pl. 38, fig. 5 |
| 1914 | Schizophoria swallovi Weller p. 167 figs. pl. 22 f. 1-6 |
| 1920 | Schizophoria swallowi Butler et al. |
| 1944 | Schizophoria swallovi Shimer and Shrock p. 357 figs. pl. 140 f. 8-9 |
| 2005 | Schizophoria (Schizophoria) swallovi Stigall Rode p. 152 fig. 4.4 |
| 2007 | Schizophoria (Schizophoria) swallovi Butts |
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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.
†Schizophoria swallowi Weller 1914
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. L. Stigall Rode 2005 | Large, biconvex S. (Schizophoria); shell height low, ventral and dorsal valves inflation-reduced; hinge line long, cardinal extremities elongate; sulcus poorly developed, onset distal; shell depth short; narrow dorsal and wide ventral umbonal angles; ventral area high, delthyrium wide, delthyrial plates upright; dorsal valve flanks dip gently away from umbonal region; ventral muscle field obchordate; dental plates form low ridge, enclose ventral muscle field; ventral median septum separates entire muscle field; ventral muscle scars short and narrow; dorsal muscle field long and narrow; antero-median ridge of the dorsal muscle field present. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Hendy 2009, Nesnidal et al. 2013 | |||||
Age range: base of the Kinderhookian to the top of the Late/Upper Mississippian or 358.90000 to 323.20000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Kinderhookian | USA (Utah) | Schizophoria swallowi (218919) | |
| Mississippian | USA (Alaska) | Schizophoria swallowi (112174) | |
| Late/Upper Mississippian | USA (Alaska) | Schizophoria swallowi (112179 112184) |