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Ukoa
Taxonomy
Ukoa was named by Öpik (1932) [Sepkoski's age data: O Llvi Sepkoski's reference number: 878]. It is the type genus of Ukoainae.
It was assigned to Plectellinae by Öpik (1932); to Ahtiellinae by Williams and Curry (1985); to Plectambonitoidea by Williams et al. (2000); to Strophomenida by Sepkoski (2002); and to Ukoainae by Pedersen and Rasmussen (2019).
It was assigned to Plectellinae by Öpik (1932); to Ahtiellinae by Williams and Curry (1985); to Plectambonitoidea by Williams et al. (2000); to Strophomenida by Sepkoski (2002); and to Ukoainae by Pedersen and Rasmussen (2019).
Species
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1908 | Plectambonites hemisphaerica Schmidt |
| 1932 | Plectambonites hemisphaerica Öpik |
| 1932 | Ukoa Öpik |
| 1982 | Ukoa hemisphaerica Jaanusson and Mutvei |
| 1985 | Ukoa Williams and Curry p. 250 |
| 2000 | Ukoa Williams et al. p. 347 |
| 2002 | Ukoa Sepkoski |
| 2019 | Ukoa Pedersen and Rasmussen figs. 7A–J; 8A–K |
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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. †Ukoa Öpik 1932
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†Ukoa ornata Öpik 1932
Invalid names: Plectambonites hemisphaerica Schmidt 1908 [nomen nudum]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Pedersen and C. M. Ø. Rasmussen 2019 | Large, strongly resupinate profile with triangular outline. Widest point at hinge line and rectimarginate anterior commissure. Ventral interarea apsacline, dorsal interarea anacline. Pseudodeltidium and chilidium closed. Unequally parvicostellate ornamentation interrupted by weak, closely spaced concentric ornament (fila). Delayed accentuated costae seen towards the rectimarginate anterior margin. Pseudopunctate. Ventral interior with triangular to heart-shaped muscle field and dorsal interior with ridge-like cardinal process fused on valve floor. Platform not present. |