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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. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013 | |||||
Age range: base of the Darriwilian to the top of the Ludfordian or 467.30000 to 423.00000 Ma
Collections (92 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Ordovician | USA (Tennessee) | D. sp. (319) | |
| Chazyan | USA (Tennessee) | D. alternata (204094 204097) D. geniculata (164884) D. sp. (308) | |
| Chazyan | Canada (Quebec) | D. sp. (305 307) Leptaena incrassata (186175 204095) Rafinesquina incrassata (172209 172351) | |
| Chazyan | USA (Vermont) | Leptaena incrassata (101749) | |
| Chazyan | USA (New York) | Leptaena incrassata (172144 172180 172184 172199) Rafinesquina incrassata (171704 171798 172226 172232 172233 172234 172235 172239 172240 172316 172317 172318 172319 172320 172330 172331 172336 172346 172347 172348) | |
| Chazyan | Canada (Ontario) | Rafinesquina incrassata (172356) | |
| Whiterockian | USA (Virginia) | D. alternata (204096) | |
| Whiterockian | USA (Nevada) | D. sp. (104389 104532) D. vespertina (104386 104406) | |
| Abereiddian | United Kingdom (Scotland) | D. sp. (164926) | |
| Abereiddian - Aurelucian | Ireland | D. costellata (188886 188892 188894) | |
| Darriwilian | USA (Virginia) | D. geniculata (162406) | |
| Llandeilo | China (GanSu) | Cyphomena sp. (8562) | |
| Llandeilo | United Kingdom (Scotland) | D. sp. (164928) | |
| Letna - Harnagian | Czech Republic | D. blyskavensis (3861) | |
| Dobrotivian | Spain (Cuidad Real) | D. asturica (219876) | |
| Aurelucian | Ireland | D. costellata (188926) | |
| Sandbian | Russian Federation (Siberia) | D. subgeniculata (205559) | |
| Caradoc | USA (Virginia) | Leptaena palustris, Rafinesquina obsoleta (34007 34028 34029 34030 34031 34032 34152 34153 34167 34168 34169) | |
| Berounian | Portugal | Blyskavomena sp. (20874 20935) | |
| Berounian - Caradoc | Portugal | Blyskavomena sp. (20954) | |
| Turinian | USA (Oklahoma) | D. sculpturata, D. subaequicostellata (186181) | |
| Ashbyan | USA (Alabama) | D. geniculata (100252) | |
| Ashbyan | USA (Virginia) | D. obtusa (203254) D. sp. (105245) D. sp. 5 (164296) D. sp. 8 (164472) Leptaena palustris, Rafinesquina obsoleta (33995 33996 33997) | |
| Blackriveran | USA (Pennsylvania) | Cyphomena angulata (162391) | |
| Blackriveran | USA (Tennessee) | Rafinesquina incrassata (5328 5329 5331) | |
| Blackriveran | USA (Oklahoma) | D. sculpturata, D. subaequicostellata (23893) | |
| Rocklandian - Kirkfieldian | United Kingdom (Northern Ireland) | D. sp., Cyphomena homostriata (89157) | |
| Burrellian | United Kingdom (Scotland) | Cyphomena homostriata, D. multicorrugata (165038 165043) D. multicorrugata (165047 165048) | |
| Chatfieldian | USA (Virginia) | Cyphomena grandis (105205) | |
| Katian | Russian Federation (Siberia) | D. subgeniculata (205627) | |
| Cheneyan | United Kingdom (Scotland) | Cyphomena homostriata, D. semiglobosina (164412) | |
| Hirnantian | Argentina | Cyphomena sp. (8890) | |
| Sheinwoodian | Czech Republic | Cyphomena joachimiana (14094) | |
| Ludfordian | Czech Republic | Cyphomena postjoachimiana (14110) |