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Dalmanella federata
Taxonomy
Orthis (Dalmanella) federata was named by Reed (1917) [pl. ix, figs. 22-23 moved to Dalmanella cheesemani by Williams (1962).].
It was recombined as Dalmanella federata by Williams (1962) and Candela and Harper (2014).
It was recombined as Dalmanella federata by Williams (1962) and Candela and Harper (2014).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1917 | Orthis (Dalmanella) federata Reed p. 851 figs. pl. ix, figs. 16-18, non figs. 19-27. |
| 1962 | Dalmanella federata Williams p. 132 figs. Pl. XII, figs. 2-6 |
| 2014 | Dalmanella federata 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.
†Dalmanella federata Reed 1917
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | Shell subcircular 'to subquadrate or subelliptical, plano-convex to unequally biconvex ; hinge-line equal to or rather less than width of shell; cardinal angles rectangular or obtuse. Pedicle-valve convex, subcarinate; beak elevated, pointed, somewhat incurved; hinge-area triangular, high, large, steeply inclined or nearly in plane of valve. Brachial valve nearly flat or gently convex, with shallow median sinus widening anteriorly, sometimes subangular; beak small, low, inconspicuous ; hinge-area narrow. Interior of pedicle-valve with suboval to subpentagonal well-defined musclescar, about one-third the length of the valve, composed of two subtriangular diductors laterally enclosing somewhat shorter adductor impression; teeth short, stout. Interior of brachial valve with small oval cardinal process, large stout short crural plates, and median rounded ridge running forwards from thick hinge-plate between two pairs of adductor scars; posterior adductors small, subcircular, well defined; anterior adductors smaller, less distinct. Surface of valves ornamented with numerous angular fasciculate ribs, the 14-20 rather coarse primaries dividing into 2 or 3 close to beak and each again into 2 or 3 smaller ones at one-half to two-thirds their length ; laterally the ribs curve back slightly; interspaces angular, deep, equal to or larger than primaries; all crossed by strong close concentric striation. | |
| A. Williams 1962 | Unequally and gently biconvex, subcircular Dalmanella with a broadly sulcate brachial valve averaging three-quarters as long as wide; ornamentation fascicostellate, somewhat coarse, so that secondary costellae in the first three sectors (i.e., la-, 2a- and 3a ~ were developed within 2 mm. of the umbo in only a minority of brachial valves; myophore of cardinal process prominent and bilobed, socket and supporting plates encased in secondary shell deposit in adult stages of growth and thus ankylosed to brachiophore bases to form a pair of subtriangular, massive structures about one-eighth as long as the brachial valve, ventral muscle-scar subcordate, about one-quarter as long as the pedicle valve; vascula media initially slightly divergent. |
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, Williams et al. 2000 | |||||