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Schizophoria (Eoschizophoria) parafragilis
Taxonomy
Schizophoria parafragilis was named by Johnson (1970). Its type specimen is USNM 156820, a shell, and it is a 3D body fossil. Its type locality is USNM 10808. North flank of Ikes Canyon, which is in a Lochkovian open shallow subtidal limestone in the McMonnigal Limestone Formation of Nevada.
It was recombined as Schizophoria (Eoschizophoria) parafragilis by Stigall Rode (2005).
It was recombined as Schizophoria (Eoschizophoria) parafragilis by Stigall Rode (2005).
Sister species lacking formal opinion data
S. allani, S. athabaskensis, S. athabaskiensis, S. bisinuata, 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 |
|---|---|
| 1970 | Schizophoria parafragilis Johnson pp. 86-87 figs. pl.8, 1-12 |
| 2005 | Schizophoria (Eoschizophoria) parafragilis Stigall Rode p. 149 |
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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 (Eoschizophoria) parafragilis Johnson 1970
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. G. Johnson 1970 | Biconvex Schizophoria with elongate ventral diductor scars and wide adductor track; brachial valve with narrowly diverging brachiophore supporting plates. | |
| A. L. Stigall Rode 2005 | Small S. (Eoschizophoria); hinge
line short; cardinal extremities rounded; poorly developed fold and sulcus, onset distal; shell depth short; shell height low; low inflation of brachial valve; highly inflated ventral valve; wide dorsal and narrow ventral umbonal angles; ventral cardinal area low, delthyrium narrow; ventral umbo extends further posteriorly than dorsal umbo, dorsal valve flanks dip gently away from umbonal region; ventral muscle field bilobate, diductor tracks parallel; dental plates form lowrelief ridge on lateral edges of ventral muscle field; ventral muscle field long and narrow; dorsal muscle field short and narrow; antero-median ridge divides dorsal muscle field. |
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 Siegen to the top of the Lochkovian or 412.30000 to 410.80000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Lochkovian | USA (Nevada) | Schizophoria parafragilis (164824) | |
| Siegen | USA (Nevada) | Schizophoria parafragilis (164726 164730) |