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Palaeostrophomena subfilosa
Taxonomy
Stropheodonta (Leptostrophia) subfilosa was named by Reed (1917).
It was recombined as Palaeostrophomena subfilosa by Williams (1962) and Candela and Harper (2014).
It was recombined as Palaeostrophomena subfilosa by Williams (1962) and Candela and Harper (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1917 | Stropheodonta (Leptostrophia) subfilosa Reed p. 895 figs. Plate XVII, figs. 9-12 |
| 1962 | Palaeostrophomena subfilosa Williams pp. 158 - 159 figs. Pl. XIV, figs. 26, 29, 30, 32 |
| 2014 | Palaeostrophomena subfilosa 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.
†Palaeostrophomena subfilosa Reed 1917
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | Shell subquadrate to semielliptical; much compressed, plano-convex; hinge-line equal to width of shell; cardinal angles rectangular, rarely obtuse. Pedicle-valve very gently convex, flattened in cardinal region laterally ; beak small, acute, scarcely projecting above hinge-line ; hinge-area narrow, linear ; hinge-line with short marginal denticulations for whole length. Interior of pedicle-valve with thin long linear dental plates diverging at about 60° to hinge-line ; muscle-scar triangular, compose/! of pair of weakly impressed flabelliform diductors, undefined in front, enclosing elongated oval adductor scar. Brachial valve flat; hinge-area narrow, linear, subequal to that on pedicle-valve ; beak small, inconspicuous. Interior of brachial valve with small bilobate cardinal process, the narrow elongate lobes diverging anteriorly at about 30° ; crural plates short, blunt, diverging at about 45° to hinge-line ; adductor scars very faint, with low broad median ridge between them. Surface of valves ornamented with very numerous fine subequal delicate radii curving back a little on each side and increasing by frequent intercalation ; every fifth or sixth radius is rather stronger, and a few of these are primaries, continuous from beak to margin. Shell densely punctate with small pits, equal and equidistant and closely set between the radial lines. A. few small short bent concentric rugse occasionally developed on each side of beak close to hinge-line, and meeting it at acute angles. | |
| A. Williams 1962 | Elongately semi-elliptical and biplanate Palaeostrophomena almost two-thirds as long as wide, ornamented by 7, or more commonly 8, costellae per millimetre antero-medianly and rarely by closely spaced rugae with a wave-length of about 0.25 mm. arranged concentrically to the umbo; ventral vascula media initially divergent, branching at almost one-half the length of the pedicle valve; subparallel lateral prolongations of the notothyrial platform absent. |