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Oligocolius
Taxonomy
Oligocolius was named by Mayr (2000). Its type is Oligocolius psittacocephalon.
It was assigned to Coliidae by Mayr (2000), Mlikovsky (2002), Mayr and Mourer-Chauviré (2004), Mayr (2013) and Mayr (2022).
It was assigned to Coliidae by Mayr (2000), Mlikovsky (2002), Mayr and Mourer-Chauviré (2004), Mayr (2013) and Mayr (2022).
Species
O. brevitarsus, O. psittacocephalon (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2000 | Oligocolius Mayr p. 86 |
| 2002 | Oligocolius Mlikovsky p. 146 |
| 2004 | Oligocolius Mayr and Mourer-Chauviré p. 370 |
| 2013 | Oligocolius Mayr p. 385 |
| 2022 | Oligocolius Mayr p. 203 figs. Fig. 10.4 |
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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. †Oligocolius Mayr 2000
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†Oligocolius brevitarsus Mayr 2000
†Oligocolius psittacocephalon Mayr 2013
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Mayr 2013 | Colius/Urocolius-sized mousebird with: (1) skull with marked nasofrontal hinge, which largely separates the upper beak from the cranium, and (2) very wide interorbital section of frontal bones; (3) mandible with greatly elongated processus retroarticulares; (4) carpometacarpus with well-developed processus intermetacarpalis; (5) os metacarpale minus projecting distally beyond os metacarpale majus; (6) tarsometatarsus much shorter than humerus (ratio humerus/tarsometatarsus 1.47, Table 1); and (7) proximal phalanges of all three anterior toes shortened.
Characters (1), (2) and (6) are here considered autapomorphies of Oligocolius. O. psittacocephalon is distinguished from O. brevitarsus in a lower ulna/tarsometatarsus ratio (1.72 in O. brevitarsus vs. 1.52 in O. psittacocephalon) and a lower carpo- metacarpus/tarsometatarsus ratio (1.06 in O. brevitarsus vs. 0.96 in O. psittacocephalon). Characters (4) and (5) distinguish the new species from all early and middle Eocene stem group Coliiformes. In character (7) it differs from the late Eocene Palaeospiza, in which the two phalanges of the third toe together are subequal in length to the third phalanx (both phalanges together are much shorter than the third phalanx in O. psittacocephalon). The new species is distinguished from the middle and late Eocene Primocolius and the early/middle Miocene Necrornis and Limnatornis in that the humerus is stouter, with a larger proximal end, and with a less ventrally prominent processus flexorius. |