|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Bivalvia - Sanguinolitidae
|Year||Name and author|
|1884||Pleurophorus monroensis Worthen p. 17|
|1890||Pleurophorus monroensis Worthen p. 125 figs. pl. 18 f. 3, 3a|
|1930||Sphenotus acutiliratus Croneis figs. pl. 18 f. 11|
|1930||Sphenotus vulgaris Croneis figs. pl. 15 f. 17|
|1974||Sanguinolites acutiliratus Busanus p. 251 figs. pl. 9 f. 8|
|1991||Sphenotus monroensis Busanus and Hoare p. 475 figs. 6.1 – 6.6|
|1993||Sphenotus monroensis Hoare p. 390 figs. 7.3 – 7.4|
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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.
|J. W. Busanus and R. D. Hoare 1991||Sphenotus with dorsal and ventral margins diverging posteriorly; distinct, angular, umbonal ridge extending to ventroposterior angle; radial ornamentation on the posteroumbonal area lacking; posterior margin with gentle convexity; ventral margin straight to slightly sinuous; prominent, anterior adductor muscle scar set off by narrow, high ridge; surface with fine growth lines that become more prominent anteriorly.
Sphenotus monroensis differs from S. vulgaris Girty, 1915, and S. striatogranulatus Hind, 1900, by having a more angular posterior margin and being more attenuate anteriorly. Sphenotus washingtonensis (Girty, 1910) has a radial rib between the umbonal ridge and the dorsal margin. Sphenotus pisinnus Hoare, Heaney, and Mapes, 1989, lacks a distinct umbonal ridge and the dorsal and ventral margins do not diverge posteriorly.
|R. D. Hoare 1993||Sphenotus with subparallel ventral and dorsal margins; anterior margin produced, curving sharply at mid-height just below well developed lunule; posterior margin truncate; beaks prosogyrate, depressed; escutcheon well developed; strong umbonal ridge sloping to posteroventral margin; surface marked by several coarse, comarginal folds, more prominent ventrally; large anterior adductor scar buttressed posteriorly.|