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Rhipidomena
Taxonomy
Rhipidomena was named by Cooper (1956) [Sepkoski's age data: O Llde O Cara-l Sepkoski's reference number: 1,397]. It is not extant. Its type is Strophomena tennesseensis.
It was assigned to Strophomenidae by Cooper (1956); to Rafinesquininae by Williams et al. (2000); to Strophomenida by Sepkoski (2002); and to Strophomeninae by Congreve et al. (2019).
It was assigned to Strophomenidae by Cooper (1956); to Rafinesquininae by Williams et al. (2000); to Strophomenida by Sepkoski (2002); and to Strophomeninae by Congreve et al. (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Rhipidomena Cooper pp. 866 - 867 |
| 2000 | Rhipidomena Williams et al. p. 241 |
| 2002 | Rhipidomena Sepkoski |
| 2019 | Rhipidomena Congreve et al. p. 273 |
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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.
G. †Rhipidomena Cooper 1956
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†Rhipidomena fillocostellata Cooper 1956
†Rhipidomena mesleri Cooper 1956
†Rhipidomena subparallela Cooper 1956
†Rhipidomena tennesseensis Willard 1928
†Rhipidomena tenuitesta Willard 1928
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shells generally large, attaining a length of about 2 inches and a width of nearly 2.5 inches ; generally wider than long, usually somewhat parallel sided cardinal extremities subrectangular to subauriculate ; convexi-concave in the adult but concavo-convex when young; anterior commissure rectimarginate. Surface finely costellate, strong and fine costellae alternate and appear in several generations; entire surface covered by fine concentric fila. Pseudopunctae finely and densely matted.
Pedicle valve with minute pedicle foramen, pseudodeltidium of moderate size and convexity; teeth small, surface smooth or roughened, supported by callus thickening ; muscle area large, occupying about half the valve area ; diductor scars broad and flabellate ; adductor scars small, located at about the middle of the muscle field on 2 low, subparallel ridges that extend anteriorly to about the valve middle where the diductors end. Posterior of delthyrial cavity filled by adventitious shell. Anterior and lateral margins with thickened inner rim. Brachial interior with thickened notothyrial platform bearing 2 stout lobes of the cardinal process having short shafts and flat myophore surfaces. Brachiophores visible as short, flat blades on the inner side of the sockets and nearly buried by adventitious shell material. Median ridge short and low ; adductor field marked by 4 short radiating ridges, 2 on each side of the median ridge ; moderately thickened rim just inside margins, but not so prominent as that of the pedicle valve. |