|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Strophomenata - Orthotetida - Triplesiidae
It was recombined as Triplesia craigensis 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.
|A. Williams 1962||Transversely, or less commonly elongately, subpentagonal Triplesia, about four-fifths as long as wide in intermediate stages of growth with a short hinge-line less than one-third the maximum width of the shell; brachial valve strongly trilobed with inflated lateral areas and a rounded, or more commonly subcarinate, median fold originating at about 3 mm. from the umbo; pedicle valve reduced in area, with a strongly geniculate median tongue directed dorsally, beak erect, shell surface apparently smooth but commonly ornamented antero-laterally by fine costellae, about 4 per millimetre, arising by intercalation and best seen on exfoliated specimens; teeth massive, dental lamellae strong, subparallel; sockets slightly curved and parallel with the hinge-line, brachiophores short, rod-like.|