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Hesperorthis australis exitis
Taxonomy
Hesperorthis australis exitis was named by Williams (1962) [figs. 18-20 are for Hesperorthis cf. australis exitis]. Its type specimen is BB.15201, a shell (complete shell), and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1962 | Hesperorthis australis exitis Williams p. 107 figs. Pl. IX, figs. 10-15, 17, 18-20 |
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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.
†Hesperorthis australis exitis Williams 1962
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1962 | Subcircular, piano-convex Hesperorthis with a pedicle valve almost one-third as deep as long and a slightly sulcate brachial valve nearly four-fifths as long as wide; ornamentation consisting of 30-33, less commonly 28 or 29, narrowly rounded costae with a wave-length of just over 0.5 mm. at 5 mm. antero-medianly of the dorsal umbo, as well as fine parvicostellae in the interspaces and delicate concentric lamellae; ventral muscle-field subtriangular, almost three-quarters as wide as long and extending anteriorly for about one-third the length of the pedicle valve. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Hendy 2009, Nesnidal et al. 2013 | |||||
Collections
No collection or age range data are available