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Arenorthis paranaensis
Taxonomy
Arenorthis paranaensis was named by Benedetto et al. (2013) [= 1991 Heterorthella freitana (Clarke, 1899) in Boucot et al., p. 513, figs 4–7]. Its type specimen is CEGH-UNC 24447a, a valve (An internal mould of dorsal valve), and it is a 3D body fossil. Its type locality is San Fernando Quarry, which is in a Hirnantian shallow subtidal sandstone/siltstone in the Eusebio Ayala Formation of Paraguay.
Synonymy list
| Year | Name and author |
|---|---|
| 2013 | Arenorthis paranaensis Benedetto et al. pp. 67 - 70 fig. 5C–W |
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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.
†Arenorthis paranaensis Benedetto et al. 2013
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. L. Benedetto et al. 2013 | Gently ventribiconvex, subcircular shells with fascicostellate ornament of 5–6 costae per 5 mm at anterior margin. Ventral muscle field large, suboval, extending for about 42 per cent valve length. Cardinal process expanded into a prominent, often trilobate myophore occupying the whole notothyrial platform. Thick brachiophores supported by proportionally short bases converging medially towards floor of valve. |