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Gondwanorthis calderensis

Rhynchonellata - Orthida - Nanorthidae

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).

Synonymy list
YearName and author
2007Nanorthis calderensis Benedetto pp. 281 - 282 fig. 8.8–8.25
2017Gondwanorthis calderensis Benedetto and Muñoz pp. 51 - 52 fig. 4AS

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EubilateriaAx 1987
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyPlectorthoideaSchuchert and Le Vene 1929
familyNanorthidaeHavlicek 1977

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.

J. L. Benedetto 2007Subcircular 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.