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Sivorthis precordillerana
Taxonomy
Sivorthis precordillerana was named by Benedetto (2015). Its type specimen is CEGH-UNC 25808a, a valve, and it is a 3D body fossil. Its type locality is Cerro La Chilca Section Palaeoglossa–Chilcorthis Association, which is in a Darriwilian deep-water shale/marl in the Los Azules Formation of Argentina.
Sister species lacking formal opinion data
Entered
by P. Wagner on 2018-07-13
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Sivorthis precordillerana Benedetto pp. 89 - 90 figs. 5.14–23, 6.1–3 |
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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.
†Sivorthis precordillerana Benedetto 2015
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. L. Benedetto 2015 | Shell transversely semielliptical (ventral valve average length/width ratio 0.76), widest at hinge with orthogonal to slightly acute cardinal extremities. Ornament costellate (38–45 rounded ribs in mature shells). Ventral muscle field proportionally wide and short raised anteriorly. Vascula media initially adjacent then curved anterolaterally. |