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Gondwanorthis calderensis
Taxonomy
Nanorthis calderensis was named by Benedetto (2007) [= Nanorthis saltensis (Kayser). Benedetto in Benedetto, 2003, pl. 20, figs. 1–4.]. Its type specimen is CEGH-UNC 21674a–b, a valve (external and internal molds of dorsal valve), and it is a mold. Its type locality is along National Road 9 near the La Caldera locality, which is in a Tremadoc transition zone/lower shoreface sandstone/shale in the Caldera Sandstone Formation of Argentina. It is the type species of Gondwanorthis.
It was recombined as Gondwanorthis calderensis by Benedetto and Muñoz (2017).
It was recombined as Gondwanorthis calderensis by Benedetto and Muñoz (2017).
Synonymy list
| Year | Name and author |
|---|---|
| 2007 | Nanorthis calderensis Benedetto pp. 281 - 282 fig. 8.8–8.25 |
| 2017 | Gondwanorthis calderensis Benedetto and Muñoz pp. 51 - 52 fig. 4AS |
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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.
†Gondwanorthis calderensis Benedetto 2007
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. L. Benedetto 2007 | Subcircular to subelliptical species of Nanorthis with multicostellate ornament; costellae tend to form bundles, 9– 10 per 2 mm. Ventral muscle field suboval, with adductor field raised anteriorly, extending beyond the anterior margin of narrower diductor scars. Brachiophore bases varying with ontogeny from bladelike, subparallel, to almost completely masked by secondary deposits. Notothyrial platform very low, subtriangular. Low ridge like cardinal process usually present. Dorsal muscle field varying with growth from indistinct to deeply impressed; adductor muscle scars subequal in size; anterior pair suboval to subtriangular, posterior pair deeply impressed, digitate. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Age range: Tremadoc or 486.40000 to 477.10000 Ma
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Tremadoc | Argentina (Jujuy) | Nanorthis calderensis (74348 193004) | |
| Tremadoc | Argentina | Nanorthis calderensis (type locality: 9091 159267) | |
| Tremadoc | Argentina (Salta) | Nanorthis calderensis (74346 74347) |