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Taxonomy
Pectunculus decisus was named by Conrad (1833). Its type specimen is ANSP 30539, a shell, and it is a 3D body fossil.
It was recombined as Limopsis decisus by Conrad (1860); it was recombined as Trinacria decisa by Cossmann (1893) and Harris (1919); it was recombined as Trigonoarca decisa by Dall (1898); it was recombined as Halonanus decisus by Stewart (1930); it was recombined as Trigonodesma decisa by Reinhart (1935); it was recombined as Trigonarca decisa by Cooke (1936); it was recombined as Pachecoa (Pachecoa) decisa by Stenzel et al. (1957).
It was recombined as Limopsis decisus by Conrad (1860); it was recombined as Trinacria decisa by Cossmann (1893) and Harris (1919); it was recombined as Trigonoarca decisa by Dall (1898); it was recombined as Halonanus decisus by Stewart (1930); it was recombined as Trigonodesma decisa by Reinhart (1935); it was recombined as Trigonarca decisa by Cooke (1936); it was recombined as Pachecoa (Pachecoa) decisa by Stenzel et al. (1957).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1833 | Pectunculus decisus Conrad p. 39 |
| 1860 | Limopsis decisus Conrad p. 297 |
| 1893 | Trinacria decisa Cossmann p. 16 |
| 1898 | Trigonoarca decisa Dall p. 606 |
| 1919 | Trinacria decisa Harris p. 38 |
| 1930 | Halonanus decisus Stewart p. 78 |
| 1935 | Trigonodesma decisa Reinhart p. 53 |
| 1936 | Trigonarca decisa Cooke |
| 1957 | Pachecoa (Pachecoa) decisa Stenzel et al. p. 69 |
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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.
†Pachecoa (Pachecoa) decisa Conrad 1833
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Diagnosis
No diagnoses are available