|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Orthida - Nanorthidae
It was recombined as Gondwanorthis calderensis by Benedetto and Muñoz (2017).
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 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.|