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130 results for “mammalian evolution”
Figure 10 in Evolution of South American mammalian predators (Borhyaenoidea): anatomical and palaeobiological implications
Figure 10. Skeletal reconstructions of various borhyaenoids. A, Mayulestes ferox, modified from Muizon (1998). B, Cladosictis patagonica. C, Lycopsis longirostris, modified from Marshall (1977a). D, Prothylacinus patagonicus. E, Borhyaena tuberata. Scale bars: 5 cm in A, 10 cm in B-E. The darkened areas represent the elements preserved. Lycopsis is drawn as found in matrix.
Figure 3 in The origin of mammalian endothermy: a paradigm for the evolution of complex biological structure
Figure 3. The interrelationships of the structures and functions responsible for or affected by endothermic temperature physiology of a mammal.
Figure 2 in The origin of mammalian endothermy: a paradigm for the evolution of complex biological structure
Figure 2. The proposed effect of a small increase in the number of mitochondria per cell on several functions of endothermy.
Figure 4 in The origin of mammalian endothermy: a paradigm for the evolution of complex biological structure
Figure 4. On the left, computer-generated walks through a multi-task landscape requiring adaptation simultaneously for light interception, mechanical stability and reproductive success. On the right, some of the optimal compromise morphologies generated by different walks (from Niklas, 1995).
Figure 1. A in The origin of mammalian endothermy: a paradigm for the evolution of complex biological structure
Figure 1. A, reconstruction of the skeleton of the therocephalian therapsid Regisaurus in lateral and dorsal views (from Kemp, 1986). B, internal view of the nasal cavity of the therocephalian Glanosuchus (from Hillenius, 1994). Abbreviations: etht?, possible ethmo-turbinal ridge; mxt?, possible maxillo-turbinal ridge; nt?, possible naso-turbinal ridge.
Figure 14 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 14. Haldanodon exspectatus, phalanges and metapodial in dorsal (A, C, F, H) and side (B, D, E, G) views. A–B, Gui Mam 30/79, phalanx II. C–D, Gui Mam 3012, metapodial probably from central position. Distal articulation facet is facing the top of page in A–D. E–F, Gui Mam 132/74–9, terminal phalanx, probably from medial or lateral position. G–H, Gui Mam 132/74–10, terminal phalanx, probably from central position.
Figure 15. Haldanodon exspectatus, Gui Mam 132 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 15. Haldanodon exspectatus, Gui Mam 132/74, phalanges. (A–F) and metapodials (G–H) in (1) dorsal and (2) side view (stereo-pairs). Distal articulation facet is facing to the top of page. A, Gui Mam 132/74–1, phalanx II. B, Gui Mam 132/ 74–2, phalanx II. C, Gui Mam 132/74–3, phalanx II. D, Gui Mam 132/74–4, phalanx II. E, Gui Mam 132/74–5, phalanx II. F, Gui Mam 132/74–6, phalanx I. G, Gui Mam 132/74–7, metapodial, probably from central position. H, Gui Mam 132/74– 8, metapodial, from medial or lateral position.
Figure 13. Haldanodon exspectatus, Gui Mam 30 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 13. Haldanodon exspectatus, Gui Mam 30/79. Right tibia in: A, anterior; B, lateral; and C, posterior view. bord., border; cran., cranial; proxlat., proximolateral; tub., tuberosity.
Figure 12. Haldanodon exspectatus, Gui Mam 47 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 12. Haldanodon exspectatus, Gui Mam 47/75. Right femur in: A, anterior (= dorsal); B, medial; C, posterior (= ventral); D, lateral; E, distal and F, proximal view. cond., condyle; lat., lateral; med., medial; troch., trochanter.
Figure 10. Haldanodon exspectatus, Gui Mam 3011 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 10. Haldanodon exspectatus, Gui Mam 3011. Left ilium in: A, lateral and B, medial aspects (stereo-pairs).
Figure 9 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 9. Haldanodon exspectatus, growth series of left humeri in anterior view. A, Gui Mam 30/79; B, Gui Mam 3001, proximal head partially missing; C, Gui Mam 3009; D, Gui Mam 3010 (reverted), proximal head partially missing; E, Gui Mam 3007, proximal part of shaft and head missing; F, Gui Mam 3002, distal portion of humerus.
Figure 7. Haldanodon exspectatus, Gui Mam 30 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 7. Haldanodon exspectatus, Gui Mam 30/79. Right forelimb as originally preserved, with (from right to left) humerus in anterior view (distal end pointing upwards), radius in an anterior view, and ulna in a lateral aspect. entepic., entepicondyle; fac., facet.
Figure 6 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 6. Reconstruction of the right scapulocoracoid of Haldanodon exspectatus based on specimens Gui Mam 30/79, Gui Mam 3000, and Gui Mam 3008. A, lateral view; B, medial view; C–E, cross sections of scapula with section planes marked. Suture between scapula and coracoid in dorsal part of glenoid. ant., anterior; infrasp., infraspinous; marg., margin; post., posterior; postsc., postscapular.
Figure 5. Haldanodon exspectatus, Gui Mam 3008 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 5. Haldanodon exspectatus, Gui Mam 3008. Right scapulocoracoid in: A, lateral; B, anterior and C, medial views (stereo-pairs). infrasp., infraspinous.
Figure 4. Haldanodon exspectatus, Gui Mam 3000 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 4. Haldanodon exspectatus, Gui Mam 3000. Left scapulocoracoid in: A, lateral; B, caudal and C, medial views. ant. mar., anterior margin; 'infrasp. fo.', 'infraspinous fossa'.
Figure 2. Haldanodon exspectatus, Gui Mam 30 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 2. Haldanodon exspectatus, Gui Mam 30/79. Left thoracal rib in a caudal aspect (posterior view).
Figure 3. Haldanodon exspectatus, Gui Mam 30 in Postcranial anatomy of Haldanodon exspectatus (Mammalia, Docodonta) from the Late Jurassic (Kimmeridgian) of Portugal and its bearing for mammalian evolution
Figure 3. Haldanodon exspectatus, Gui Mam 30/79. A and B, right scapulocoracoid in: A, lateral and B, medial views. C–E, left scapulocoracoid in: C, lateral; D, caudal and E, medial views.
Mammalian Evolution of Human cis-regulatory Elements and Transcription Factor Binding Sites
<p>Code and data associated with the manuscript entitled "Mammalian Evolution of Human cis-regulatory Elements and Transcription Factor Binding Sites "</p>
Input data from: Mammalian forelimb evolution is driven by uneven proximal-to-distal morphological diversity
<p>Vertebrate limb morphology often reflects the environment due to variation in locomotor requirements. However, proximal and distal limb segments may evolve differently from one another, reflecting an anatomical gradient of functional specialization that has been suggested to be impacted by the timing of development. <span>Here we explore whether the temporal sequence of bone condensation predicts variation in the capacity of evolution to generate morphological diversity in proximal and distal forelimb segments across more than </span>600 species of mammals. Distal elements not only exhibit greater shape diversity, but also show stronger within-element integration and, on average, faster evolutionary responses than intermediate and upper limb segments. Results are consistent with the hypothesis that late-developing distal bones display greater morphological variation than more proximal limb elements. However, the higher integration observed within the autopod deviates from such developmental predictions, suggesting that functional specialization plays an important role in driving within-element covariation. Proximal and distal limb segments also show different macroevolutionary patterns, albeit not showing a perfect proximo-distal gradient. The high disparity of the mammalian autopod, reported here, is consistent with <span>the higher potential of development to generate variation in more distal limb structures, as well as functional specialization of the distal elements.</span></p>
Input data from: Mammalian forelimb evolution is driven by uneven proximal-to-distal morphological diversity
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International Brain Laboratory public data
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