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Anoptambonites grayae

Strophomenata - Strophomenida - Hesperomenidae

Leptaena grayae was named by Davidson (1883) [Leptaena Grayae = ? Leptaena llandeiloensis Davidson 1883, p. 171 pars, pl. xii, figs. 27-29, non fig. 26.].

It was recombined as Leptella grayae by Reed (1917); it was recombined as Anoptambonites grayae by Williams (1962), Mitchell (1977), Cocks (2005), Rasmussen et al. (2012) and Candela and Harper (2014).

Sister species lacking formal opinion data

View classification of included taxa

Synonymy list
YearName and author
1883Leptaena grayae Davidson p. 171 figs. pl. 12, figs 23–25
1917Leptella grayae Reed pp. 873 - 874 figs. Plate XIII, figs. 10-17
1962Anoptambonites grayae Williams p. 171 figs. pl. XVI, figs 11–14, 17.
1977Anoptambonites grayae Mitchell
2005Anoptambonites grayae Cocks
2012Anoptambonites grayae Rasmussen et al. pp. 29 - 30 figs. Plate 6, figures 8–14
2014Anoptambonites grayae Candela and Harper pp. Supplement 1

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phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyPlectambonitoideaJones 1928
familyHesperomenidaeCooper 1956
speciesgrayae(Davidson 1883)

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.

F. R. C. Reed 1917Shell transversely subsemicircular to semielliptical or subtriangular, widest along hinge-line; concavo-convex; cardinal angles rather less than right angles or rectangular. Pedicle-valve convex, subcarinate, most elevated along middle line, lateral slopes more or less flattened; beak small, pointed, not incurved; hinge-area triangular, at right angles to plane of valve, with triangular delthyrium. Brachial valve slightly concave; beak inconspicuous; hinge-area very narrow. Interior of pedicle-valve with small stout teeth and short rounded flabelliform divergent diductors about one-fifth the length of valve. Interior of brachial valve with sharp prominent raised concentric ridge, emarginate in middle, situated at about half the length of valve, bounding pair of large saucer-like areas in contact in middle line along thin single or double median ridge joining emargination of concentric ridge in front and here much elevated as a blunt spine; saucer-shaped areas radiately grooved and containing weakly impressed faint flabelliform adductor scars divisible into two contiguous radiating pairs. Surface of shell ornamented with numerous straight low radiating subequal rounded thread-like radii numbering 100-120 on the margin, and increasing in number from the beak by frequent intercalation at irregular distances, some of the radii (primaries) being slightly stronger than the others; all crossed by fine concentric striation.
A. Williams 1962Elongately semi-oval Anoptambonites with a strongly convex pedicle valve almost threequarters as long as wide and over one-third as deep as long; ornamentation finely multicostellate with costellae numbering 4 per millimetre antero-medianly; lophophore platform subquadrate, over two-thirds as long as wide and about two-thirds as long as the brachial valve.