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7 results for “Octodontoidea”
FIGURE 5 in A new acaremyid rodent (Hystricognathi: Octodontoidea) from the middle Miocene of Patagonia (South America) and considerations on the early evolution of Octodontoidea
FIGURE 5. Strict consensus of the most parsimonious tree (Length=40.178; CI=0.600, RI=0.727) resulting from cladistic analysis of a modified matrix of Vucetich & Kramarz (2003). The numbers in bold indicate Bremer indices, numbers in italics represent absolute Jackknife values, and numbers in gray represent GC Jackknife values.
FIGURE 2. Comparison between Sciamys petisensis and Sciamys principalis. S in A new acaremyid rodent (Hystricognathi: Octodontoidea) from the middle Miocene of Patagonia (South America) and considerations on the early evolution of Octodontoidea
FIGURE 2. Comparison between Sciamys petisensis and Sciamys principalis. S. petisensis, MPEF-PV 3561, right dp4-m1 (A), and S. principalis, MACN PV SC 2394, right dp4-m1 (B). Abbreviations: afd, anterofossettid; med I, metalophulid I; med II, metalophulid II. Scale bars equal 1mm.
FIGURE 4 in A new acaremyid rodent (Hystricognathi: Octodontoidea) from the middle Miocene of Patagonia (South America) and considerations on the early evolution of Octodontoidea
FIGURE 4. Ontogenetic series showing the transitional octodontiform molar pattern in S. petisensis sp. nov. MPEF-PV 3561, right dp4-m1 (shown as left) (A); MPEF-PV 3563, left dp4 (partially preserved)-m2 (B); MPEF-PV 3560, right p4-m3 (shown as left) (C); MPEF-PV 3566, left m1-m3 (D); MPEF-PV 3562, left p4-m3 (E). Scale bars equal 1mm.
FIGURE 3 in A new acaremyid rodent (Hystricognathi: Octodontoidea) from the middle Miocene of Patagonia (South America) and considerations on the early evolution of Octodontoidea
FIGURE 3. Sciamys petisensis, MPEF-PV 3560 (Holotype), right p4-m3 (A); Sciamys principalis, MACN PV FSC2314, right p4-m3 (B); S. petisensis, MPEF-PV 3561, right mandible with dp4-m1 (C); S. petisensis, MPEF-PV 3560, right mandible with p4-m3 (D). Abbreviations: afd, anterofossettid; hld, hypolophid; maf, masseteric fossa; mf, metal foramen; mmpim, insertion for the tendon of the masseter medialis pars infraorbitalis muscle; msd, mesolophid; psd, posterolophid. Scale bars equal 1mm.
First virtual endocast description of an early Miocene representative Pan-Octodontoidea (Caviomorpha, Hystricognathi) and considerations on the early brain evolution in South American rodents
<p><span>The study of the cranial endocast provides valuable information to understand the behavior of an organism since it coordinates sensory information and motor functions. In this work, we describe for the first time the anatomy of the encephalon of an early Miocene pan-octodontoid caviomorph rodent (<em>Prospaniomys</em> <em>priscus</em>) found in the Argentinean Patagonia, based on virtual 3D endocast. This fossil rodent has an endocast morphology here considered ancestral for Pan-Octodontoidea and also other South American caviomorph lineages, such as an encephalon with anteroposteriorly aligned elements, mesencephalon dorsally exposed, well-developed vermis of the cerebellum, rhombic cerebral hemispheres with well-developed temporal lobes. <em>Prospaniomys</em> also has relatively small olfactory bulbs, large paraflocculi of the cerebellum, low endocranial volume, and a degree of neocorticalization. Its EQ is lower compared with Paleogene North American and European non-caviomorph rodents, but slightly higher than several late early and late Miocene caviomorphs. The paleoneurological anatomical information supports the hypothesis that <em>Prospaniomys</em> was a generalist caviomorph rodent with terrestrial habits, and enhanced low-frequency auditory specializations. The scarce paleoneurological information indicates that several endocast characters in caviomorph rodents could change with ecological pressures. This work sheds light on the anatomy and evolution of several paleoneurological aspects of this particular group of South American rodents. </span></p>
First virtual endocast description of an early Miocene representative Pan-Octodontoidea (Caviomorpha, Hystricognathi) and considerations on the early brain evolution in South American rodents
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FIGURE 1 in A new acaremyid rodent (Hystricognathi: Octodontoidea) from the middle Miocene of Patagonia (South America) and considerations on the early evolution of Octodontoidea
FIGURE 1. Location map of El Petiso Locality (Chubut Province), Argentina.
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