|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Eoplectodonta (Eoplectodonta) semirugata plicata
Strophomenata - Strophomenida - Sowerbyellidae
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||Semicircular, concavo-convex Eoplectodonta most commonly subcarinate in transverse profile with a pair of lateral plicae, pedicle valve over one-half as long as wide; radial ornamentation consisting of differentially thickened parvicostellae, with a modal count of 15 costellae per 2 mm. in the median portions of pedicle valves about 5 mm. anterior of the umbones; postero-lateral rugae paired, acutely inclined to the hinge-line and most commonly numbering less than 7 within 5 mm. of the right side of the ventral umbo; hinge-line denticulate in adult stages of growth; dental lamellae short and divergent, elliptical impressions of ventral muscle-field separated by median ridge and about one-sixth as long as the pedicle valve; median septum of brachial valve developing later than the lateral pair, becoming strong and high.|