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Laventiana Annectens, New Genus and Species: Fossil Evidence for the Origins of Callitrichine New World Monkeys (Platyrrhines/La Venta/Marmosets/Miocene) ALFRED L

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Laventiana Annectens, New Genus and Species: Fossil Evidence for the Origins of Callitrichine New World Monkeys (Platyrrhines/La Venta/Marmosets/Miocene) ALFRED L Proc. Nati. Acad. Sci. USA Vol. 88, pp. 2137-2140, March 1991 Evolution Laventiana annectens, new genus and species: Fossil evidence for the origins of callitrichine New World monkeys (platyrrhines/La Venta/marmosets/Miocene) ALFRED L. ROSENBERGER*, TAKESHI SETOGUCHIt, AND WALTER CARL HARTWIG* *Department of Zoological Research, National Zoological Park, Smithsonian Institution, Washington, DC 20008; tPrimate Research Institute, Kyoto University, Aichi 404, Japan; and tLaboratory for Human Evolutionary Studies, Department of Anthropology, University of California, Berkeley, CA 94720 Communicated by F. Clark Howell, November 26, 1990 ABSTRACT A previously unidentified middle Miocene square molars with large hypocones and connecting primate from the La Venta deposits of Colombia is interme- commissures. diate between squirrel monkeys (Saimin) and callitrichines (marmosets and tamarins) in the morphology of the lower In arranging the dental character states of platyrrhines into a molars, mandible, and talus. Laventiana annectens is closely morphocline, Thomas laid the groundwork for new evolu- related to Saimiri and to Cebus (capuchin monkeys) yet resem- tionary interpretations. Diagnostic callitrichine features are bles the probable callitrichine morphotype, demonstrating that now considered derived rather than primitive conditions, archaic relatives ofa Saimiri-like stock were suitable structural based upon comparative anatomy (12, 13) and allometric (14, ancestors for the enigmatic callitrichines. Laveniana is also 15), ecological (3, 16, 17), and cladistic analyses (4, 18) ofthe more primitive than Saimir (= Neosaimin) fieldsi from the living forms. This, in turn, has led to a variety of hypotheses same fauna, further increasing the likelihood that the latter is regarding the phylogenetic origins (1, 18, 19) of callitrichines a lineal ancestor of modern squirrel monkeys. from within a monophyletic Platyrrhini. The new species described here presents a morphological pattern not seen among living platyrrhines. It appears to be Less is known about the evolution of the small-bodied, the first record to our knowledge ofan intact lower tooth row clawed marmosets and tamarins-the callitrichines-than of primitive cebine design. The morphology of its lower any other major group ofextant anthropoids (1). Incongruous molars completes a morphocline parallel to Thomas' arrange- morphological (2-4) and biochemical studies (5) and a poor ment of the upper molars. In doing so, it provides fossil fossil record (1, 6) have left uncertain their phylogenetic evidence corroborating the hypothesis that callitrichines are position among New World monkeys. A newly discovered the sister group of cebines (20). fossil from the Miocene of Colombia, represented by a lower The fossil material, discovered in 1988, derives from the La jaw and talus, pertains to the question ofcallitrichine origins. Although cladistically related to extant cebines (Cebus and Venta badlands ofthe Magdalena River Valley in west central Saimiri), it is intermediate between callitrichines and Saimiri Colombia. La Venta has produced the largest fossil verte- in molar, mandibular, and talar morphology and demon- brate assemblage from northern South America (21) and the strates that archaic relatives of squirrel monkeys are suitable continent's richest record of Tertiary primates (22-25). The structural ancestors for this enigmatic radiation of miniature specimens were discovered in the upper redbeds of the anthropoids. Villavieja Formation, which is overlain uncomformably by Anatomists such as T. H. Huxley (7), Beattie (8), Le Gros the Mesa Formation. Radiometric dates for the latter provide Clark (9, 10), and their followers (2), impressed by the a minimal geochronological age of >7.8 + 0.5 megannum seemingly primitive features of most modern callitrichines (Ma; 106 years) (Ma) (26) or >8.5 + 0.4 Ma. A conservative (Callithrix, Cebuella, Leontopithecus, Saguinus, Callimico), age estimate ofthe other primate-bearing beds at La Venta is including small body size, three-cusped upper molars, clawed 12-15 Ma (27), although recent discoveries are reported to be and nonopposable digits, plural litter sizes, poorly convo- slightly older (23). luted brains, and reliance on olfaction, related the origins of callitrichines to tarsioids (8) or to a basal anthropoid stock (9). SYSTEMATICS After a long period during which callitrichines were consid- ered separate from the other platyrrhines, Oldfield Thomas Order Primates Linnaeus, 1758 (ref. 11, see p. 132-133) erased the perceived morphologic Suborder Haplorhini Pocock, 1918 and taxonomic barriers by demonstrating that a newly dis- Infraorder Platyrrhini E. Geoffroy, 1812 covered Amazonian form, Callimico goeldii, was an inter- Superfamily Ateloidea Gray, 1825 mediate link between the two groups: Family Cebidae Bonaparte, 1831 Subfamily Cebinae Bonaparte, 1831 It is to be noted that the difference in structure between Laventiana, gen. nov. molars with hypocones and those without is not so Laventana annectens, sp. nov. abrupt as it sounds, for there is almost a perfect series of gradations from (1) the marmosets, which have no Type specimen. IGM-KU (Instituto Nacional de Investi- trace of hypocone, through (2) Callimico, which has a gaciones Geologico-Mineras/Kyoto University) 8801a, a slight rise in the cingulum that might be called a young adult mandible preserving perfectly the right and left potential hypocone, to (3) Saimiri, which has small and C-M2 (canines through lower second molars) and alveoli for simple hypocones, and is itselfagain separated from (4) the incisors (Ii and I2) and third molars (M3) (Fig. 1); IGM-KU Callicebus and other monkeys which have complicated 8801b, a right talus found in association with the mandible, presumably of the same individual. The publication costs ofthis article were defrayed in part by page charge Age and locality. Middle Miocene (Friasian land-mammal payment. This article must therefore be hereby marked "advertisement" age) of the La Venta area; the Masato Site, in the upper in accordance with 18 U.S.C. §1734 solely to indicate this fact. redbeds (28) of the Villavieja Formation. 2137 Downloaded by guest on September 26, 2021 2138 Evolution: Rosenberger et al. Proc. Natl. Acad. Sci. USA 88 (1991) ., . ...S. \ ,.. i *F w 11I .. 71|1fil : 5 s ,4 b. } .t b :. W* i. :. Ilk Om f>; P 1) -40i, i W. FIG. 1. Occlusal (a) and lateral (b) views of IGM-KU 8801a, type specimen of Laventiana annectens. The mandible retains C-M2, with preserved alveoli for I112 and M3. Note the postentoconid notch present on the molars. (c) Occlusal view of the left halfof UCMP 39205, Saimiri (= Neosaimiri) fieldsi, also from La Venta, is included for comparison. Etymology. Laventiana, after La Venta (the wind); an- lariform, with a small metaconid and a short talonid heel. In nectens, L. ad-, towards + nectens, tying or connecting, in contrast to the premolars, the molars of Laventiana lack the reference to the fossil's phylogenetic implications. defining occlusal pattern of genus Saimiri. For example, the Diagnosis. A Saimiri-sized cebine characterized by the crown sidewall does not flare from cusp tip to cervix; the combination of acutely cusped postcanine crowns, relatively ectoflexid is small as the cristid obliquid is not sharply angled; large broad P2 (second premolar), and shallow mandibular the buccal cingulid is very small on M1 and is only a tiny corpus, differing from all known platyrrhines in having a remnant on M2. Measurements are given in Table 1. The postentoconid notch on M12, and further distinguished from molars ofLaventiana are also slightly longer than in Saimiri; Saimiri by a narrower P4 and relatively longer and narrower mandibular dimensions are somewhat smaller (29). M1 2 (approximately 15%), the latter with incipiently devel- Like the premolar morphology, the talus of Laventiana is oped buccal cingulids. similar to modern cebines, especially Saimiri, in all features DESCRIPTION AND COMPARISONS Table 1. Linear measurements (mm) of Laventiana annectens The morphology of C-P4 (Fig. 1) strongly resembles the mandible* teeth modern species of Saimiri and a Miocene species, also from P4 Ml M2 La Venta, that has been synonomized recently into the same C P2 P3 tri tal tri tal tri tal genus, S. (= Neosaimirt)fieldsi (29). As with all Saimiri, the lower canine ofLaventiana is high-crowned, vertical, robust, Length 2.7 2.4 2.2 1.4 0.8 1.4 2.0 1.1 1.9 and slightly recurved. P2 is relatively massive, with a laterally Breadth 3.3 2.4 2.5 2.7 2.8 2.9 2.7 2.5 canted protoconid apex, elongate canine honing blade, strong tri, trigonid; tal, talonid. lingual cingulid, and distolingual cristid; P3 is similar to P2, *Mandible depth (below M2) = 7.6 mm; mandible breadth (below M2) only smaller and without the honing extension; P4 is premo- = 2.9 mm. Downloaded by guest on September 26, 2021 Evolution: Rosenberger et al. Proc. Natl. Acad. Sci. USA 88 (1991) 2139 b 60% % total molar area o atelines * pitheciines a lrer @ cebines Saguinus Callimico Saimiri Cebus A callitrichines ml Laventiana I XS.fieldsi /X /\ A ~~~~~AllimAco Soimidri Cebaus I -to 6' 20% d\u FIG. 2. (a) Phylogenetic relationships of the fossils Laventiana annectens and Saimirifieldsi and selected cebines and callitrichines. The most conservative position for Laventiana is shown. Schematics of right-cheek teeth illustrate the location of the postentoconid notch (*) in Laventiana and morphoclines in hypocone development and cingulid structure. Only
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