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Parastrophina balcletchiensis
Taxonomy
Rhynchonella balclatchiensis was named by Davidson (1883).
It was recombined as Camerella balclatchiensis by Reed (1917); it was recombined as Parastrophina balclatchiensis by Williams (1962); it was recombined as Parastrophina balcletchiensis by Candela and Harper (2014).
It was recombined as Camerella balclatchiensis by Reed (1917); it was recombined as Parastrophina balclatchiensis by Williams (1962); it was recombined as Parastrophina balcletchiensis by Candela and Harper (2014).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1883 | Rhynchonella balclatchiensis Davidson p. 160 figs. pl. x, fig. 15, non fig. 16 nec pl. xi, fig. 23 |
| 1917 | Camerella balclatchiensis Reed pp. 923 - 924 figs. pl. xxii, figs. 12-15 |
| 1962 | Parastrophina balclatchiensis Williams pp. 226 - 227 figs. P1. XXIII, figs. 21, 22, 25, 28-30; Fig. 11 |
| 2014 | Parastrophina balcletchiensis 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.
†Parastrophina balcletchiensis Davidson 1883
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | Shell subtriangular to subpentagonal, broadest anteriorly, rounded at sides, usually as wide as long or rather wider than long, biconvex. Pedicle-valve with median sinus commencing at from one-third to one-half the length of the valve, increasing rapidly in width to anterior margin to more than one-third the anterior width of shell, shallow, rounded, with floor more or less produced into tongue ; lateral
margins of sinus angular, more or less strongly elevated on front margin; floor of sinus with single narrow median rib of variable length and sometimes nearly obsolete ; lateral portions of valve gently convex, with traces of one or more angular short marginal plications, often obsolete, forming zigzag junctions of margin; beak small, acute, elevated, very slightly incuryed, higher than that of opposite valve ; triangular delthyrium below beak. Brachial valve usually more convex than pedicle-valve, with a more or less developed fold towards anterior margin composed of a pair of rather closely placed small angular or subangular plications of variable length, becoming highest on anterior margin; lateral portions of valve more or less convex and .dependent, occasionally with weak marginal plications; beak obtuse, low, small. Surface of valves smooth. | |
| A. Williams 1962 | Unequally biconvex, subpentagonal Parastrophina with rounded lateral sides and anterior margin, pedicle valve slightly wider than long, shell over two-thirds as deep as wide with a more convex brachial valve inflated posteriorly and elevated anteriorly along a fold originating between 3 and 5 mm. anterior to the umbo and consisting of a pair of subangular costae complementary to a median costa in a deep ventral sulcus that is over two-thirds as wide as the maximum width of the shell; dorsal flanks steeply convex, bearing 2 or 3 pairs of short subangular costae; spondylium duplex, supported by a median septum almost one-half as long as the pedicle valve, cruralial septum extending anteriorly for about onethird the length of the brachial valve. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Hendy 2009, Aberhan et al. 2004, Nesnidal et al. 2013 | |||||