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Cheracebus (titi monkeys)
Taxonomy
Cheracebus was named by Byrne et al. (2016). It is extant.
It was assigned to Callicebinae by Byrne et al. (2016).
It was assigned to Callicebinae by Byrne et al. (2016).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Cheracebus Byrne 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. Cheracebus Byrne et al. 2016 [titi monkeys]
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Cheracebus lucifer Thomas 1914
Cheracebus lugens Humboldt 1811
Cheracebus medemi Hershkovitz 1963
Cheracebus purinus Thomas 1927
Cheracebus regulus Thomas 1927
Cheracebus torquatus Hoffmannsegg 1807
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Byrne et al. 2016 | Cheracebus comprises the torquatus group titis as defined by Hershkovitz [5, 12, 15], Kobayashi [13] and Groves [16] (Fig. 4). Hershkovitz’s [5] review contains detailed descriptions of the dental, cranial and post-cranial characters which distinguish the torquatus group, and hence, now the genus Cheracebus, from all other titi mon- keys. He described the diagnostic characters as follows: “Average size larger than that of other species except C. personatus (Tables eleven, thirteen), ethmo- turbinal I larger, projecting farther behind than the maxilloturbinal bone [...] average cerebral index high (Table nine) [29 % of greatest skull length], diploid chromosome number = 20 (subspecies unknown) [see below], forehead, forearms, sideburns, feet, and tail blackish; crown reddish, reddish brown, mahogany, or blackish; side- burns little projecting; throat collar whitish or buffy, some- times not well defined or absent; hands blackish, buffy, yellowish, or orange; upper parts from crown to tail base reddish brown, conspicuously to faintly banded or uni- formly colored; chest, belly uniformly reddish, reddish brown, or blackish” [5] (p. 78).
Jones and Anderson [34] summarised the diagnos- tic characters in a taxonomic key distinguishing Callicebus personatus from Callicebus torquatus and Callicebus moloch, based on Hershkovitz [15]: “Color of body reddish to black, venter either not or slightly defined from dorsum; hind feet and tail to tip black;forearms black above and below; upper surface of forefeet either whitish or blackish like the wrists”. According to Kobayashi [27], the occlusal pattern of the upper molars is relatively smooth and simple in the torquatus group. Groves [16] (p. 176 − 177) added that the mesostyle and distostyle on the upper premolars are well defined, whereas in the other species-groups they are absent on P2 and weak or absent on P3-4; an entepicondylar foramen is present that is lacking in all other species; and the limbs are very long: arm 67 − 73 % of trunk length, leg 90 %. Groves [16] did not agree with Hershkovitz’s [5] assertion that the torquatus group titis are unusually large. The estimated time of divergence of Cheracebus from all other titis is 11 million years in the Middle Miocene. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Ji et al. 2002, Lillegraven 1979, Hendy et al. 2009, Nowak 1999 | |||||
Collections
No collection or age range data are available