|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Terebratulida - Dielasmatidae
It was synonymized subjectively with Terebratula amygdala by Campbell (1965); it was recombined as Fletcherithyris biundata by Waterhouse (1982), Waterhouse (1987) and Clarke (1987).
|Year||Name and author|
|1847||Terebratula amygdala Dana p. 152|
|1847||Atrypa biundata M'Coy p. 20 figs. Pl 13, figs 9-9a|
|1849||Terebratula amygdala Dana p. 682 figs. Pl 1, figs 2a-d|
|1961||Fletcherina amygdala Stehli p. 453 figs. Pl 61, figs 7,10,11,14,15,19-22|
|1965||Fletcherithyris amygdala Campbell p. 26 figs. Pl 3, figs 1-6; pl 6, figs 11-34; text-figs 7-9|
|1982||Fletcherithyris biundata Waterhouse p. 62 figs. Pl 15e,j,17a,c|
|1987||Fletcherithyris biundata Clarke p. 284 figs. 19A-Z|
|1987||Fletcherithyris biundata Waterhouse p. 46 figs. Pl 13, figs 12-16|
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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. B. Waterhouse 1987||Medium-sized shells with broadly sinuate or sulciplicate anterior commissure, and low anterior ventral fold and dorsal sulcus in many specimens. Septalium high and only 0.18 to 0.22 of length of valve. Crural points very high.|