Craniodental ontogeny of the pacarana<i>Dinomys branickii</i>Peters 1873 (Rodentia, Hystricognathi, Caviomorpha, Dinomyidae)

Nasif, Norma; Abdala, Fernando

doi:10.1093/jmammal/gyv131

Cited by 27 publications

(22 citation statements)

References 52 publications

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“…Finally, it is worth noting that traits characterizing the craniomandibular shape of Eumysops (i.e. large orbits, shortened and vaulted braincase, and low condylar process in the mandible) are frequent in early ontogenetic stages of caviomorphs with a contrasting adult morphology (Nasif & Abdala ). New studies involving ontogenetic constraints and phenotypic integration (Klingenberg ; Goswami et al .…”

Section: Discussionmentioning

confidence: 99%

Unravelling the distinctive craniomandibular morphology of the Plio‐PleistoceneEumysopsin the evolutionary setting of South American octodontoid rodents (Hystricomorpha)

et al. 2019

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Echimyidae is a species-rich clade of Neotropical rodents, which diversified in association with forested biomes. Since the late Miocene, a few lineages from southern South America have been adapted to open environments. Eumysops is one of these southern echimyids, and its peculiar craniomandibular morphology has been assumed to be a result of adaptation to open environments. We performed a geometric morphometric analysis of craniomandibular shape variation to explore whether, as suspected, Eumysops is divergent from other echimyids and octodontoids. In addition, we explored whether deterministic factors driven by different ecological dimensions can explain the diversification of shape among octodontoids. We found that craniomandibular shape variation in octodontoids was related to ecological variables. Comparing competing evolutionary models suggested that the input of selective factors play a key role in octodontoid craniomandibular shape diversification; habitat and habits were found to be the most influential factors. In the analysed morphospaces, Eumysops was located distant from other echimyids due to its distinctive traits, especially wide and posteriorly displaced orbits, and related low craniomandibular joint. Divergent orbits and resulting wider panoramic vision support the interpretation of Eumysops as an open-habitat specialist echimyid. But what is more relevant, is that Eumysops occupied a sector of the octodontoid cranial morphospace not filled by living representatives; this highlights the contribution of fossils in providing key information on the specialization boundaries explored by a clade throughout its history.

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Section: Discussionmentioning

confidence: 99%

Unravelling the distinctive craniomandibular morphology of the Plio‐PleistoceneEumysopsin the evolutionary setting of South American octodontoid rodents (Hystricomorpha)

et al. 2019

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“…Soriamys , Garridomys and Dinomys ; see Kramarz, 2001a; Kramarz et al. ; Nasif & Abdala, ) is well known, but there are almost no studies on chinchillids on this regard, except for Eoviscaccia (Vucetich, ; Kramarz, 2001b). We identified different ontogenetic states in the Chinchillidae Eoviscaccia , Prolagostomus , Lagostomus and Lagidium (Figs 2–), and the main cusps and lophs were identified in unworn molars of the living chinchillids Lagostomus maximus and Lagidium sp.…”

Section: Resultsmentioning

confidence: 99%

“…(); (H‐K) modified from Kramarz et al. (); (L) modified from Kramarz (); (P,Q) modified from Nasif & Abdala (); (C,D,F‐H,L,M,P) reversed. Colours indicate dental anatomy as in Fig.…”

Section: Resultsmentioning

confidence: 99%

Upper molar morphology, homologies and evolutionary patterns of chinchilloid rodents (Mammalia, Caviomorpha)

Rasia

Candela

2018

Journal of Anatomy

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Chinchilloidea are a clade of caviomorph rodents that includes seven living species, the Dinomyidae Dinomys branickii, the Chinchillidae Lagostomus maximus, two species of Chinchilla and three species of Lagidium. In addition, two extinct families are traditionally considered chinchilloids -Neoepiblemidae and Cephalomyidae. The phylogeny of the Chinchilloidea has so far not been well established and is based on partial analyses. Studying the anatomy and ontogeny of extinct and extant taxa, we propose homologies for the upper molars of Chinchilloidea for which these homologies have not been previously proposed: that is the Chinchillidae Prolagostomus, Lagostomus, Lagidium and Chinchilla, and the Neoepiblemidae Neoepiblema and Phoberomys. We identify patterns of occlusal simplification within Chinchilloidea and evaluate its importance in an evolutionary context. A phylogenetic analysis recovered Dinomyidae, Chinchillidae and Neoepiblemidae as clades. 'Cephalomyidae' have not been not recovered as a monophyletic group and 'cephalomyids' are closely related to Neoepiblemidae. Branisamys is not included within the Dinomyidae and appears to be a basal chinchilloid.

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“…The studied specimen is housed in the Vertebrate Paleontological Collection of the Facultad de Ciencias, Departamento de Paleontología, Uruguay (FC-DPV). As a comparative framework oriented towards analysing the ontogenetic development of the Tetrastylinae, we studied specimens in different ontogenetic stages of the genus Dinomys, and followed the recent study of Nasif & Abdala (2015) about the craniodental ontogeny of this genus. The present study considers four stages of ontogenetic development: the neonate, juvenile (specimens with some unerupted tooth, or some tooth with minimal worn, including the stages juvenile II-V in Nasif & Abdala, 2015), subadult (specimens with all erupted and functional tooth, but less worn than in full-growth adult, subadult VI in Nasif & Abdala, 2015) and adult stage (adult VII in Nasif & Abdala, 2015).…”

Section: Methodsmentioning

confidence: 99%

“…The most extreme example is the giant Josephoartigasia monesi Rinderknecht & Blanco, 2008, the largest rodent ever recorded with an estimated mean body mass close to a ton (Rinderknecht & Blanco, 2008; but see Blanco, 2008;Millien, 2008). The fossil record of the Dinomyidae undoubtedly begins during the middle Miocene (Friasian?/Laventan SALMA), but the genus Branisamys Hoffstetter & Lavocat, 1970 from the Salla beds in Bolivia (Deseadan SALMA, late Oligocene) has been placed in the family by some authors (see Vucetich et al, 1999;Nasif, 2009;Nasif & Abdala, 2015). Fossil members of the Dinomyidae have been described from almost every South American country (Figure 1), being the collections from Argentina, Colombia, Venezuela, Brazil and Uruguay the most important.…”

Section: Introductionmentioning

confidence: 99%

First record of Tetrastylus Ameghino, 1886 (Rodentia; Dinomyidae) from the Upper Miocene of Uruguay

Rinderknecht¹,

Gutiérrez²,

Beron³

et al. 2019

Rev. bras. paleontol.

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Craniodental ontogeny of the pacaranaDinomys branickiiPeters 1873 (Rodentia, Hystricognathi, Caviomorpha, Dinomyidae)

Cited by 27 publications

References 52 publications

Unravelling the distinctive craniomandibular morphology of the Plio‐PleistoceneEumysopsin the evolutionary setting of South American octodontoid rodents (Hystricomorpha)

Unravelling the distinctive craniomandibular morphology of the Plio‐PleistoceneEumysopsin the evolutionary setting of South American octodontoid rodents (Hystricomorpha)

Upper molar morphology, homologies and evolutionary patterns of chinchilloid rodents (Mammalia, Caviomorpha)

First record of Tetrastylus Ameghino, 1886 (Rodentia; Dinomyidae) from the Upper Miocene of Uruguay

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