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Orthorhynchuloides nasutus
Taxonomy
Hemithyris nasuta was named by McCoy (1852).
It was recombined as Rhynchonella nasuta by Davidson (1869); it was recombined as Protorhyncha nasuta by Reed (1917); it was recombined as Orthorhynchuloides nasuta by Williams (1962); it was recombined as Orthorhynchuloides nasutus by Candela and Harper (2014).
It was recombined as Rhynchonella nasuta by Davidson (1869); it was recombined as Protorhyncha nasuta by Reed (1917); it was recombined as Orthorhynchuloides nasuta by Williams (1962); it was recombined as Orthorhynchuloides nasutus by Candela and Harper (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1852 | Hemithyris nasuta McCoy p. 203 figs. pl. i, L, figs. 5, 5a. |
| 1869 | Rhynchonella nasuta Davidson p. 173 figs. pl. xxiii, fig. 19 |
| 1917 | Protorhyncha nasuta Reed pp. 937 - 938 figs. Plate XXIII, figs. 20-23 |
| 1962 | Orthorhynchuloides nasuta Williams pp. 241 - 242 figs. Pl. XXV, figs. 1-7) |
| 2014 | Orthorhynchuloides nasutus 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.
†Orthorhynchuloides nasutus McCoy 1852
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | Shell longitudinally oval to subquadrate, either longer than wide or about as wide as long ; cardinal angles and sides rounded; anteriorly more or less produced into rounded tongue and marginally sinuated ; unequally biconvex ; hinge-line curved. Pedicle-valve less convex than brachial valve, but with more prominent higher imperforate (?) beak rising above hinge-line, incurved, with triangular hinge-area and small triangular open delthyrium below it; surface of pedicle-valve with broad shallow flat-bottomed sinus increasing in width anteriorly, and having steeply sloping sides and angulated edges towards front margin ; floor of sinus occupied by 6-7 equal regular ribs; sides of sinus with usually one similar rib in posterior half but smooth anteriorly; lateral portions of valve convex, covered with 12-16 somewhat smaller and closer straight ribs; interior of valve with short median septum in umbonal region. Brachial valve more convex than opposite valve, with weak rounded median fold on surface increasing in height and width anteriorly; beak much smaller and lower than that of pedicle-valve, obtuse, incurved; surface of fold bearing 5-7 ribs, and lateral lobes bearing 12-16 similar or slightly smaller ribs. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013 | |||||