Oreonax Flavicauda Descriptive Essay

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Introduction

The alpha taxonomy of living New World monkeys is experiencing an extreme makeover. The turning point behind this new perspective may be taken as the publication of Groves' (2001) book “Primate Taxonomy.” After decades of consolidation and stability beginning in the late 1940s, largely based on the contributions of Philip Hershkovitz, recent treatments have promulgated quite a different picture of platyrrhine biodiversity. Contemporaries of Hershkovitz working under a similar paradigm, such as Napier and Napier (1967) and Napier (1976) who, like Groves, surveyed the systematics of all primates, recognized 64 and 67 platyrrhine species, respectively. Groves recognizes 112. The difference is remarkable, and it has large implications for systematics, evolutionary theory and conservation. The difference results largely from elevating subspecies-level taxa to full species rank. As far as we are aware, this movement toward split taxonomies (i. e., as in the traditional distinction of “lumpers” and “splitters”) has not been scrutinized scientifically by primatologists. Groves's platyrrhine classification (2001, and references therein) is also a departure in the number of modern platyrrhine genera recognized, three more than the authoritative and widely accepted works of the Napiers (Napier and Napier, 1967; Napier, 1976) and Hershkovitz (e.g., 1977). One of these is Oreonax, the genus which Groves (2001) revived for a species of Woolly monkey, flavicauda, that had fallen into synonymy decades ago. The purpose of this report is to explain that the analysis which led Groves (2001) to raise the rank of the species L. flavicauda to the genus level is flawed, making his phylogenetic interpretation and taxonomic decision unjustified.

Groves' study was based on an algorithmic cladistic analysis of 20 craniodental characteristics involving five ateline species, one (none were identified by species name) taken from each living genus — Alouatta, Lagothrix, Ateles, Brachyteles — and a pair of species representing Lagothrix (explicitly lagotricha and flavicauda). In a complimentary analysis, he also added the Brazilian subfossils Caipora and Protopithecus, but this aspect did not add meaningfully to the results. The character state data was analyzed under parsimony criteria using PAUP (Swofford, 1993). Groves found that the species flavicauda was more closely related to Ateles sp. than to L. lagotricha. Having thus discovered that Lagothrix is non-monophyletic, Groves elected to remove flavicauda to the genus Oreonax.

Figure 1. Four different parsimonious cladograms (from Matthews and Rosenberger, in press) based on the data and methods of Groves (2001), as explained in the text. All use five ateline species as the study group, one each from Alouatta, Lagothrix and Ateles and two for Lagothrix, flavicauda and one other. Fig. la is a tree that we generated which replicates Groves's result, his basis for resurrecting fiavicauda as Genus Oreonax Thomas. The three alternatives, and several others (Matthews and Rosenberger, in press), were obtained using different combinations of five species drawn from the four ateline genera. The absence of a stable, replicable cladistic result indicates the Groves's tree is an artifact of taxonomic sampling.


Methods

As explained more fully elsewhere (Matthews and Rosenberger, in press), we replicated Groves' (2001) study and his results, and then extended his methodology to include more taxa belonging to the genera he studied in order to see if it produced a stable outcome that was consistent with his findings. We also made slight modifications in his dataset that are fully justified and explained in Matthews and Rosenberger. The taxonomic distribution of the original set of craniodental characters are listed in tabular form in these sources. This direct test is a more challenging one than a critique in which we would have developed an entirely independent analysis, or if we had introduced new types of data. We showed that a large variety of minimallength, incongruent parsimonious cladograms can be generated by varying the number and taxonomic composition of species included as in-group taxa, the very ones whose interrelationships are being tested.


Results

There is no solid evidence that Lagothrix, as classically constituted, is paraphyletic; there is no solid evidence that flavicauda is closer cladistically to Spider monkeys than to the Common woolly monkey. Figure 1 shows a sample of cladograms that we generated by analyzing the Groves (2001) characters with a more recent version of PAUP* (Swofford, 2002); additional examples appear in Matthews and Rosenberger (in press). Several points need to be made: 1) when replicating Groves' protocols as precisely as possible, we obtain the same tree (Fig. 1A), 2) when adding new ateline taxa to the sample, but still maintaining his 5 species / 20 character matrix, the results diverge from Groves' result and the monophyly and interrelationships of the ateline genera begin to vary in unstable ways (Fig. 1B–1D), 3) the driving force behind these variations appears to be the taxonomic composition of the five species defined as the in-group, or study group. Cladograms resembling the outcome Groves found occurred only under specific conditions, when they included L. lagotricha and Alouatta seniculus in the study group. For example, when we substituted L. lagotricha with another Woolly monkey taxon (poeppigii, cana or lugens) in combination with fiavicauda, the monophyly of flavicauda and Ateles sp., the crux of Groves' new findings, was broken.


Discussion and Conclusion

These results reflect an underappreciated shortcoming of algorithmic parsimony analysis and possibly of cladistic analyses in general (including likelihood and Bayesian approaches), that topologies generated from some character sets are highly sensitive to the taxonomic composition of the study sample. Collins (2003) found essentially the same thing in his molecular study of ateline intergeneric relationships. The outcomes varied as he sampled more and different species within the genera. Similar results were also obtained by Sargis (2007) and Silcox (2007) using morphological data in studies involving the relationships of primates to other orders of mammals. Thus the constraints that drive taxonomic sampling to skew cladistic analyses with programs like PAUP appear to occur irrespective of data type and taxonomic level.

Regarding Oreonax, we offer some additional thoughts on why Groves' (2001) study may have been problematic from the outset. First there is a practical issue in the nature of the craniodental material Groves used that raises some questions. Lagothrix flavicauda is poorly represented in museum collections (Mittermeier et al., 1977). Groves' samples of skulls were the only two specimens in the collections of the American Museum of Natural History (AMNH) and in the United States. They are curiously different in morphology from the holotype and others in the Natural History Museum (British Museum of Natural History, London), a young adult male and female (Fig. 2) plus a juvenile. The AMNH individuals are aged, with very heavily worn teeth and some anatomical peculiarities in jaw and cranial shape. Skins, with the typical flavicauda yellow proximal tail, are associated with these and the London specimens, so the species identifications are probably correct. However, unlike the AMNH material, the London skulls do not differ much from samples of lagotricha in craniodental anatomy. After consulting with Groves (pers. comm.) some years ago regarding the morphology of the AMNH specimens, we believed it would be wise to split Lagothrix into two subgenera (see Hartwig et al., 1996). Groves went a step further as a consequence of his parsimony analysis. We can only offer that genus Lagothrix may be somewhat variable craniodentally (as is Ateles, but neither case is well documented). While this is not a satisfactory status report on research materials or intrageneric variation, we hope it encourages a more comprehensive reinvestigation of the systematics of Lagothrix and study of the full sample of cranial material, including the skulls in Lima, Peru (Mittermeier et al., 1977).

Figure 2. Craniodental morphology of the (right) adult male, the holotype, and (left) female specimen of Lagothrix flavicauda in the Natural History Museum (BMNH). The morphology is basically indistinguishable from L. lagotricha.

A second point relates to the data Groves (2001) employed. As we discuss to some extent in Matthews and Rosenberger (in press), several of his anatomical characters were problematic, or were coded in ambiguous ways. We tested this by asking three other primate morphologists to score a sample of ateline skulls using Groves' system, and used their determinations in separate PAUP runs. All three produced different cladograms. At another level, some of the features Groves employed, whether or not they are well defined or the characters states easily verified by others, would appear to be low-level population variations that we think would not be reliable as cladistic indicators at the generic level (Matthews and Rosenberger, in press). Finally, we raise a philosophical question. Systematists understand that naming a genus — unlike identifying and naming a species, which has a biological reality — is an artful practice, though it is not without mutually agreed guidelines. We do not believe Groves' (2001) decision to recognize Oreonax followed standard practice, irrespective of the difficulties of his parsimony analysis. Conventionally, living primate genera are “defined” by morphology (implicitly or explicitly involving functional/adaptive uniqueness), often with an emphasis on the skull and dentition (even if the taxon is first identified by molecular means and cladistics). Differential diagnoses of ateline genera are not plentiful, as these formalistic descriptions are usually published only as a part of broadly based, synthetic taxonomic revisions. Napier (1976) and Groves (2001), for example, offer such diagnoses and provide at least a brief paragraph of details that allow for identification and diagnosis of each genus by the skull and teeth. Napier (1976) also presents generically distinctive features pertaining to body shape, limbs, hands and feet, and external genitalia. It is worth noting that although she had access to the type series Oldfield Thomas (1927) used in naming Oreonax flavicauda when writing her catalogue of primates in the Natural History Museum, Napier retained this species in genus Lagothrix, citing the authority of Fooden's (1963) revision.

Groves (2001) also provides apt craniodental and somatic descriptions of Alouatta, Ateles, Brachyteles and Lagothrix. However, he offers no similar differentia for Oreonax, no anatomical description or list of features that either characterizes Oreonax or distinguishes it from any other platyrrhines. In fact, we would argue that the description he gives for his concept of Lagothrix perfectly encompasses flavicauda as well as lagotricha. Instead of an explicit morphological diagnosis, Groves (2001:194) presents the cladistic analysis of traits and concludes:

...the yellow-tailed woolly monkey should be separated generically from Lagothrix, because there are no derived character states that appear to unite them; and from all other atelines, because the bootstrap value for the clade uniting it with Ateles, its putative closest relative, is not high. Its taxonomic position is isolated.

In other words, Groves' (2001) decision to separate flavicauda from Lagothrix is based on his inability to establish the monophyly of Woolly monkey species on the basis of his characters and method. However, by the same logic, because his study was so limited in scope, it could also be argued that the one unidentified species of Ateles that grouped with flavicauda should also thus be a candidate for generic status, either monotypically or grouped with flavicauda. Applying Groves' logic to our complimentary multi-species study would suggest that numerous new genera ought to be erected, since in many cases the cladograms (Fig. 1) yielded novel clusters and irresolute branching sequences. Also, the “isolated” status of the flavicauda linkage, which Groves evidences by low PAUP bootstrap values, has no biological or phylogenetic meaning. The low numerical value means that the characters analyzed do not consistently link flavicauda with Ateles sp., more probably because the linkage is wrong or the evidence for it is weak; not because it is sending a biological signal of uniqueness that has classificatory relevance. Essentially, flavicauda has been misclassified because a heuristic measure of statistical support has been misconstrued as a biological and phylogenetic characteristic.

The reality is that among all the modern platyrrhines there is no mistaking the dense, woolly brownish coat, stocky body build, thick-looking limbs and tail, and naked helmeted face of a Woolly Monkey from any other platyrrhine. These same characteristics make it hard to tell apart flavicauda from lagotricha unless one examines the underside of the tail and pubic region, which tends to be a light golden brown in flavicauda. It has yet to be proven that flavicauda differs in biologically meaningful ways from lagotricha that would justify separating it at the genus level. We also wonder if the small allopatric population of Yellowtailed woolly monkeys can even be shown convincingly to be a different species from its congeners using modern morphological and molecular approaches. We submit that there is no rationale for dividing Woolly monkeys into two genera, Lagothrix and Oreonax, and the notion should be rejected.


Acknowledgements

Financial support was provided by the Tow Faculty Travel Fellowship, Brooklyn College (City University of New York) and through a PSC CUNY Research Award to ALR. Institutional support for this research was provided by the New York Consortium in Evolutionary Primatology (NYCEP).


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