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Orthorhynchula linneyi
Taxonomy
Orthis linneyi was named by James (1881) [Orthis? linneyi]. It is the type species of Orthorhynchula.
It was recombined as Orthorhynchula linneyi by Hall and Clarke (1893) and Howe (1979).
It was recombined as Orthorhynchula linneyi by Hall and Clarke (1893) and Howe (1979).
Synonymy list
Year | Name and author |
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1881 | Orthis linneyi James p. 41 |
1893 | Orthorhynchula linneyi Hall and Clarke p. 181 |
1979 | Orthorhynchula linneyi Howe pp. C10 - C13 figs. Plate 4, figures 11-18; plate 5, figure 7; plate 6, figures 1-15; plate 7, figures 1-4 |
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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.
†Orthorhynchula linneyi James 1881
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Diagnosis
Reference | Diagnosis | |
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H. J. Howe 1979 | Shell subtriangular to occasionally subelliptical in outline; apical angle slightly more than 90°; sides broadly rounded; valves subequal in depth, the brachial valve deeper and showing greatest width at the middle; width somewhat exceeding length; hinge line short, averaging somewhat less than half of the shell width. Surface costate, ornamented with 3 costae in sulcus, 4 on the fold, and 7 to 13 on the flanks.
Pedicle valve gently to moderately convex in in lateral profile, displaying the greatest convexity between the umbo and the middle of the valve. Umbo swollen with moderately steep sides; flanks gently inflated. Sulcus originating in front of umbo and forming a mesial depression that increases in width to about one-half the shell width at the front. Interarea of pedicle valve short but well defined, averaging somewhat less than one-half the shell width; delthyrium large, open, with small apical foramen usually present through beak resorption. Brachial valve moderately to strongly convex in lateral profile, displaying the greatest curvature in the posterior half. Umbo inflated, merging anteriorly with a fold which bears four costae, the lateral pair of which are weaker and lower than the median costae; fold becoming moderately elevated at the front and occupying about one-half the valve width. Flanks moderately convex. Dorsal interarea smaller than the ventral one and varying from about four- , tenths to one-half the valve width. |
Measurements
No measurements are available
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Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
References: Nesnidal et al. 2013, Aberhan et al. 2004, Hendy 2009 |
Age range: base of the Chatfieldian to the top of the Maysvillian or 453.80000 to 449.60000 Ma
Collections (24 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Caradoc | USA (Virginia) | Orthorhynchula linneyi (204960) | |
Caradoc | USA (Georgia) | Orthorhynchula linneyi (32456 32457 32458 32547 32552 32553 32554 32557 32558) | |
Caradoc | USA (Tennessee) | Orthorhynchula linneyi (5373) | |
Late/Upper Ordovician | USA (Maryland) | Orthorhynchula linneyi (406 409) | |
Franklinian - Edenian | USA (Tennessee) | Orthorhynchula linneyi (5370 5371) | |
Shermanian | USA (Tennessee) | Orthorhynchula linneyi (5361 5368) | |
Shermanian | USA (Kentucky) | Orthorhynchula linneyi (99569) | |
Chatfieldian | USA (Kentucky) | Orthorhynchula linneyi (34559) | |
Edenian - Caradoc | USA (Tennessee) | Orthorhynchula linneyi (5372) | |
Maysvillian | USA (Virginia) | Orthorhynchula linneyi (5396) | |
Maysvillian | USA (Kentucky) | Orthorhynchula linneyi (76970) | |
Maysvillian | USA (Tennessee) | Orthorhynchula linneyi (5374) | |
Maysvillian - Richmondian | USA (Ohio) | Orthorhynchula linneyi (351) |