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Dactylogonia

Strophomenata - Strophomenida - Strophomenidae

Synonyms
Synonymy list
YearName and author
1942Dactylogonia Ulrich and Cooper
1956Cyphomena Cooper pp. 840 - 841
1976Blyskavomena Havlicek
1977Cyphomena Mitchell
1977Dactylogonia Mitchell
2000Dactylogonia Williams et al. p. 227
2002Blyskavomena Sepkoski, Jr.
2002Cyphomena Sepkoski, Jr.
2002Dactylogonia Sepkoski, Jr.
2017Dactylogonia Liljeroth et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyStrophomenoideaKing 1846
familyStrophomenidaeKing 1846
subfamilyFurcitellinaeWilliams 1965
genusDactylogoniaUlrich and Cooper 1942

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.

Diagnosis
ReferenceDiagnosis
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.