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Pionodema girvaniensis
Taxonomy
Orthis girvanensis was named by Davidson (1868).
It was recombined as Orthis (Dalmanella) girvanensis by Reed (1917); it was recombined as Pionodema girvanensis by Williams (1962); it was recombined as Pionodema girvaniensis by Candela and Harper (2014).
It was recombined as Orthis (Dalmanella) girvanensis by Reed (1917); it was recombined as Pionodema girvanensis by Williams (1962); it was recombined as Pionodema girvaniensis by Candela and Harper (2014).
Sister species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1868 | Orthis girvanensis Davidson p. 216 figs. pl. xxviii, fig. 10 |
| 1917 | Orthis (Dalmanella) girvanensis Reed p. 852 figs. pl. ix, figs. 28-30 |
| 1917 | Hemipronites thomsoni Reed p. 919 figs. Plate XXI, figs. 27, 28 |
| 1962 | Pionodema girvanensis Williams pp. 146 -148 figs. P1. XIII, figs. 13-16, 18 |
| 2014 | Pionodema girvaniensis Candela and Harper pp. Supplement 1 |
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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.
†Pionodema girvaniensis Davidson 1868
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Invalid names: Pionodema thomsoni Reed 1917 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 (Hemipronites thomsoni) | Shell subcircular to subelliptical, strongly biconvex; hinge-line rather less than maximum width ; cardinal angles obtuse or rounded. Pedicle-valve convex, rounded, not carinate, much longer than brachial valve, with high elevated pointed beak, slightly incurved, and with cardinal slopes meeting at 80°-100° at beak ; hinge-area large, high, triangular, lying nearly in plane of valve or slightly sloping back, concave, with triangular open delthyrium. Brachial valve transversely elliptical, with traces of a broad median depression generally present; beak small, inconspicuous, obtuse ; hingearea narrow, steeply inclined. Surface of valves covered with very numerous closely placed regular equal rounded low riblets dividing usually close to margin, and numbering about 150 on edge of valves, gently curved back on lateral portions of shell, and all crossed by fine concentric strise, with 2-3 lamellose growth-ridges near margins. Interior unknown. |
Measurements
No measurements are available
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| Source: g = genus, f = family, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013, Williams et al. 2000, Hendy et al. 2009 | |||||