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Dactylogonia
Taxonomy
Dactylogonia was named by Ulrich and Cooper (1942).
It was assigned to Leptaenidae by Mitchell (1977); to Strophomenida by Sepkoski (2002); and to Furcitellinae by Williams et al. (2000) and Liljeroth et al. (2017).
It was assigned to Leptaenidae by Mitchell (1977); to Strophomenida by Sepkoski (2002); and to Furcitellinae by Williams et al. (2000) and Liljeroth et al. (2017).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1942 | Dactylogonia Ulrich and Cooper |
| 1956 | Cyphomena Cooper pp. 840 - 841 |
| 1976 | Blyskavomena Havlicek p. 369 |
| 1977 | Cyphomena Mitchell |
| 1977 | Dactylogonia Mitchell |
| 2000 | Dactylogonia Williams et al. p. 227 |
| 2002 | Blyskavomena Sepkoski |
| 2002 | Cyphomena Sepkoski |
| 2002 | Dactylogonia Sepkoski |
| 2017 | Dactylogonia Liljeroth et al. |
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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. †Dactylogonia Ulrich and Cooper 1942
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†Cyphomena homostriata indicissa Williams 1962
†Dactylogonia alternata Cooper 1956
†Dactylogonia blyskavensis Havlicek 1967
†Dactylogonia costellata Liljeroth et al. 2017
†Dactylogonia extensa Cooper 1956
†Dactylogonia geniculata Ulrich and Cooper 1942
†Dactylogonia incrassata Hall 1847
†Dactylogonia multicorrugata Reed 1917
†Dactylogonia obsoleta Butts 1926
†Dactylogonia palustris Willard 1928
†Dactylogonia semiglobosina Davidson 1870
†Dactylogonia vespertina Ross 1970
Invalid names: Blyskavomena Havlicek 1976 [synonym], Cyphomena Cooper 1956 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 (Cyphomena) | Shell generally transversely subrectangular in outline, concavo-convex in profile; valves strongly geniculated toward the brachial valve. Surface marked by fine subequal radial costellae crossed by fine concentric lines. Costellae not grouped into zones of different sizes as in Dactylogonia. Pseudopimctate.
Pedicle valve with small but stout teeth ; thick plates extend as a rim nearly completely around the suboval muscle field. Diductor scars subcrescentic, elongate, located on each side of a short, low median ridge which divides the muscle field but is extended anteriorly for a short distance only. Incipient vascula media extend directly anteriorly from the anterior ends of the diductors. Foramen and pseudodeltidium leptaenoid. Brachial interior with broad, shallow sockets, the inner wall of which is formed by the outer face of a broad, flat brachiophore ; notothyrial cavity filled by a thick platform which supports the cardinal process and nearly buries the brachiophore with lateral extensions. Median ridge short, extending from notothyrial platform and dividing the posterior adductors. Cardinal process formed of 2 narrow, short-shafted pieces with flat myophores. Chilidium strongly convex and covering part of the myophore surfaces. Adductor field narrowly triangular or arrow shaped in outline with the apex directed anteriorly; posterior adductors the larger, located outside the anterior pair and apparently divided into pairs by a more or less thick oblique ridge. Anterior pair elongate and separated by a short, low median ridge. |