|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Strophomenata - Orthotetida - Triplesiidae
It was recombined as Oxoplecia andersoni by Williams (1962) and Candela and Harper (2014).
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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.
|F. R. C. Reed 1917||Shell transversely elliptical to subquadrate, biconvex, more or less inflated; hinge-line less than width of shell; cardinal angles rounded. Pedicle-valve slightly swollen near beak, with strong median sinus, having flat floor and steep sides, increasing in width to margin and ending in rounded short obtuse tongue more or less strongly bent up to meet fold in opposite valve ; beak rather swollen, rising above hinge-line, incurved ; hinge-area small, steeply inclined, triangular; lateral lobes of valve somewhat swollen ; teeth small, supported on thin divergent dental plates; muscle-scars very faint. Brachial valve swollen, slightly emarginate in front, with abruptly elevated rounded median fold increasing in width to margin and having steep sides and flattened top; lateral lobes rounded, dependent; beak swollen, less high but more incurved than that of opposite valve ; interior of valve with stout cardinal process (base only known) and pair of short rod-like crura; two pairs of faint subcircular large adductor scars, the posterior ones better marked and separated by narrow sharp transverse curved ridges from anterior pair. Surface of valves ribbed, having 6-7 low subequal or equal subangular or rounded closely placed ribs both on the fold and in the sinus, and 8-13 rather larger simple similar ribs of uniform size on each lateral lobe slightly curved back ; occasionally the ribs on fold and in sinus increase in number by division.|
|A. Williams 1962||Large, transversely subpentagonal Oxoplecia about four-fifths as long as wide ventrally; brachial valve strongly inflated, over one-half as deep as wide with a low, fiat-crested fold and steeply convex flanks, pedicle valve less convex; radial ornamentation costellate with low rounded costellae, less than 1 mm. in wave-length at 7.5 mm. anterior to the umbo, with up to 8 on the fold and up to 15 on each of the lateral areas; dental lamellae strong, divergent; brachiophores small, rod-like, intimately associated with widely spaced sockets.|