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Oxoplecia subborealis
Taxonomy
Rhynchonella subborealis was named by Davidson (1883) [Rhynchonella sub-borealis].
It was recombined as Orthorhynchula subborealis by Reed (1917); it was recombined as Oxoplecia subborealis by Williams (1962), Candela and Harper (2014).
It was recombined as Orthorhynchula subborealis by Reed (1917); it was recombined as Oxoplecia subborealis by Williams (1962), Candela and Harper (2014).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1883 | Rhynchonella subborealis Davidson p. 149 figs. pl. x, figs. 5, 6 |
| 1917 | Orthorhynchula subborealis Reed pp. 938 - 939 figs. pl. xxiii, figs. 26, 27 |
| 1962 | Oxoplecia subborealis Williams pp. 152 - 153 figs. P1. XIII, figs. 32, 37, 39--44; P1. XIV, fig. 1 |
| 2014 | Oxoplecia subborealis 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.
†Oxoplecia subborealis Davidson 1883
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | Shell transversely elliptical, gently biconvex, rarely swollen ; hinge-line straight, about three-fourths the width of shell. Pedicle-valve with rather prominent elevated slightly incurved beak, with triangular concave hinge-area below (? and delthyrium covered by pair of deltidial plates); median sinus moderately deep to shallow, widening anteriorly, with sides sloping and floor bearing 2-4 subangular subequal ribs; lateral lobes with 5-7 rather larger or subequal subangular ribs straight or gently curved back. Brachial valve deeper than pedicle-valve, with smaller low inconspicuous incurved beak and very narrow hinge-area; median fold rounded, more or less distinctly elevated, rising anteriorly, less than one-third width of shell on front margin, composed of 3-4 subangular equal ribs; lateral lobes gently convex, bearing 5-7 straight or slightly curved equal subangular ribs. | |
| A. Williams 1962 | Subpentagonal to transversely quadrate, biconvex Oxoplecia with the width of the hingeline over one-half the maximum width of the shell and with the brachial valve over two-thirds as long as wide and over one-third as deep as wide, median dorsal fold and ventral sulcus narrow and variably defined but commonly gently rounded with steep sides; ornamentation consisting of fine concentric lamellae, about 8 per millimetre and closely adherent to the shell, and coarse, sharp-crested costellae, with 3-5 on the fold and up to 18 on the flanks; dental lamellae narrowly divergent and strong, extending anteriorly for about one-quarter of the length of the pedicle valve. |
Measurements
No measurements are available
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| Source: g = genus, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013, Hendy et al. 2009 | |||||
Age range: base of the Burrellian to the top of the Cheneyan or 456.60000 to 451.30000 Ma
Collections (9 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Burrellian | United Kingdom (Scotland) | Oxoplecia subborealis (165038 165043 165046 165048 165049 165050 192745) | |
| Cheneyan | United Kingdom (Scotland) | Oxoplecia subborealis (164412 164950) |