{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T15:18:24Z","timestamp":1791299904121,"version":"4.1.0"},"reference-count":53,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2005,5,2]],"date-time":"2005-05-02T00:00:00Z","timestamp":1114992000000},"content-version":"vor","delay-in-days":7426,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American J Phys Anthropol"],"published-print":{"date-parts":[[1985,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>A recently discovered partial skeleton of the adapid <jats:italic>Cantius trigonodus<\/jats:italic> from the early Eocene Willwood Formation of the Bighorn Basin, Wyoming, documents substantial new information about the anatomy of the oldest lemuriform primates. It is very similar in all features to its descendant, middle Eocene <jats:italic>Notharctus<\/jats:italic>, and both exhibit numerous resemblances to certain extant Malagasy lemurs, particularly <jats:italic>Lepilemur<\/jats:italic>, <jats:italic>Propithecus<\/jats:italic>, <jats:italic>Lemur<\/jats:italic>, and <jats:italic>Hapalemur griseus<\/jats:italic>. Like these forms, <jats:italic>Cantius<\/jats:italic> had relatively long hind limbs and short forelimbs. Forelimb traits (prominent brachialis flange of the humerus, well\u2010developed olecranon process of the ulna, and strong shafts of the ulna and radius) suggest active use of the forelimbs in progression. Specializations in the hind limb (e.g., expanded articular surface of the femoral head, narrow and elevated patellar trochlea and prominent lateral trochlear ridge, posteriorly oriented femoral and tibial condyles, narrow and elongate talus, and hallucal metatarsal with prominent peroneal tubercle) indicate capabilities for leaping and for powerful grasping with an opposable hallux. <jats:italic>Cantius<\/jats:italic> was presumably primitive in having a relatively long ischium and much more distal inferior tibial tuberosity than most extant lemurs\u2014traits suggesting that powerful extension of the thigh and flexion at the knee were important in its locomotion and posture. We interpret <jats:italic>Cantius<\/jats:italic> as an active arboreal quadruped with a propensity for leaping. The existence of this skeletal structure in one of the oldest primates of modern aspect suggests that it represents the primitive lemuriform morphology.<\/jats:p>","DOI":"10.1002\/ajpa.1330660107","type":"journal-article","created":{"date-parts":[[2005,8,8]],"date-time":"2005-08-08T18:30:28Z","timestamp":1123525828000},"page":"73-89","source":"Crossref","is-referenced-by-count":58,"title":["The skeleton of early Eocene <i>Cantius<\/i>, oldest lemuriform primate"],"prefix":"10.1002","volume":"66","author":[{"given":"Kenneth D.","family":"Rose","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alan","family":"Walker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,5,2]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"1","article-title":"Geology and mammalian paleontology of the Sand Creek Facies, lower Willwood Formation (lower Eocene), Washakie County, Wyoming","volume":"2","author":"Bown TM","year":"1979","journal-title":"Wyo. 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