The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Zhonghe Zhou - One of the best experts on this subject based on the ideXlab platform.
-
Exceptional preservation of soft tissue in a new specimen of Eoconfuciusornis and its biological implications
National Science Review, 2017Co-Authors: Xiaoting Zheng, Jingmai K. O’connor, Xiaoli Wang, Yanhong Pan, Yan Wang, Min Wang, Zhonghe ZhouAbstract:We report on an exceptional specimen of Eoconfuciusornis preserving rare soft-tissue traces of the ovary and wing. Ovarian follicles preserve a greater hierarchy than observed in Jeholornis and enantiornithines, suggesting confuciusornithiforms evolved higher rates of yolk deposition in parallel with the neornithine lineage. The preserved soft tissues of the wing indicate the presence of a proPatagium and postPatagium, whereas an alular Patagium is absent. Preserved remnants of the internal support network of the proPatagium bear remarkable similarity to that of living birds. Soft tissue suggests the confuciusornithiform proPatagium could maintain a cambered profile and generate lift. The feathers of the wing preserve remnants of their original patterning; however, this is not strongly reflected by observable differences under scanning electron microscopy (SEM). The tail plumage lacks elongate rectrices, suggesting that the earliest known confuciusornithiforms were sexually dimorphic in their plumage.
-
Photographs of soft tissue under laser fluorescence from IVPP V13156.
2016Co-Authors: Amanda R. Falk, Thomas G. Kaye, Zhonghe Zhou, David A. BurnhamAbstract:(A) Wing showing proPatagium. Scale bar = 5 mm. (B) Wing showing postPatagium. Scale bar = 5 mm. (C) Line drawing of a modern Gallus gallus wing showing outline of Patagium in relation to the bones of the forelimb, dorsal view. (D) Line drawing of a modern Gallus gallus wing showing outline of Patagium in relation to the bones of the forelimb, ventral view. (C) and (D) by Elizabeth Myers.
Xiaoting Zheng - One of the best experts on this subject based on the ideXlab platform.
-
Exceptional preservation of soft tissue in a new specimen of Eoconfuciusornis and its biological implications
National Science Review, 2017Co-Authors: Xiaoting Zheng, Jingmai K. O’connor, Xiaoli Wang, Yanhong Pan, Yan Wang, Min Wang, Zhonghe ZhouAbstract:We report on an exceptional specimen of Eoconfuciusornis preserving rare soft-tissue traces of the ovary and wing. Ovarian follicles preserve a greater hierarchy than observed in Jeholornis and enantiornithines, suggesting confuciusornithiforms evolved higher rates of yolk deposition in parallel with the neornithine lineage. The preserved soft tissues of the wing indicate the presence of a proPatagium and postPatagium, whereas an alular Patagium is absent. Preserved remnants of the internal support network of the proPatagium bear remarkable similarity to that of living birds. Soft tissue suggests the confuciusornithiform proPatagium could maintain a cambered profile and generate lift. The feathers of the wing preserve remnants of their original patterning; however, this is not strongly reflected by observable differences under scanning electron microscopy (SEM). The tail plumage lacks elongate rectrices, suggesting that the earliest known confuciusornithiforms were sexually dimorphic in their plumage.
Adam Urbanek - One of the best experts on this subject based on the ideXlab platform.
-
Bohemograptus papilio sp. nov. three-dimensionally preserved monograptid (Graptolithina) with an adaptation to retard sinking, from the Upper Silurian Poland
Comptes Rendus Palevol, 2013Co-Authors: Anna Kozłowska, Adam UrbanekAbstract:Abstract An unexpected new form of Bohemograptus with unusual morphological structure has been found in the upper part of the Bohemograptus praecornutus Biozone, Upper Ludlow of the Mielnik borehole, Poland. Bohemograptus papilio sp. nov. has the characteristic rhabdosome for Bohemograptus , in addition to extraordinary paired latero-dorsal additions, not comparable to any processes typical for Bohemograptus thecal openings. The new structure, a Patagium, is located in the proximal part of the rhabdosome, and is built from main rods dividing repeatedly into thinner lists with significant remnants of membranes spread between them. Another new structure is the virgellarium, a membranous addition to the virgella. Membranes of the Patagium and virgellarium are not built from microfusellar tissue as additions in other bohemograptids. It is suggested that the membranous additions were orientation devices, constructed to retard the sinking of the colony in the water column.
-
Bohemograptus papilio sp. nov. three-dimensionally preserved monograptid (Graptolithina) with an adaptation to retard sinking, from the Upper Silurian Poland Bohemograptus papilio sp. nov., monograptidé (Graptolithina) conservé en trois dimensions av
2013Co-Authors: Adam UrbanekAbstract:AnunexpectednewformofBohemograptuswithunusualmorphologicalstructurehasbeenfound in the upper part of the Bohemograptus praecornutus Biozone, Upper Ludlow of theMielnik borehole, Poland. Bohemograptus papilio sp. nov. has the characteristic rhabdo-some for Bohemograptus, in addition to extraordinary paired latero-dorsal additions, notcomparable to any processes typical for Bohemograptus thecal openings. The new struc-ture, a Patagium, is located in the proximal part of the rhabdosome, and is built from mainrods dividing repeatedly into thinner lists with significant remnants of membranes spreadbetween them. Another new structure is the virgellarium, a membranous addition to thevirgella. Membranes of the Patagium and virgellarium are not built from microfusellartissue as additions in other bohemograptids. It is suggested that the membranous addi-tions were orientation devices, constructed to retard the sinking of the colony in the watercolumn.© 2012 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
Valle Del Cauca - One of the best experts on this subject based on the ideXlab platform.
-
Análisis filogenético del murciélago hematófago Desmodus rotundus en el Valle del Cauca Colombia Phylogenetic analyses of the hematophagous bat Desmodus rotundus in Valle del Cauca, Colombia
2016Co-Authors: Fernando Favian, Castro Castro, Jaime Eduardo, Muñoz Flores, Wilson Uieda, Valle Del CaucaAbstract:Phylogenetic analyses of the hematophagous bat Desmodus rotundus were performed in villages belonging to Valle del Cauca, Cauca and Amazonas regions. Samples were mainly collected at hematophagous bat shelters located in Victoria, Aguila, Obando, Cartago, Zarzal, San Pedro, Cerrito and Palmira villages belonging to Valle del Cauca region, two samples at Mercaredes which belong to Cauca, two samples at Puerto Narino which is part of Amazonas region. Epithelial tissue samples were collected from bat’s Patagium, and submitted to PCR using primers 16 SL and 16SH amplifying mitochondrial DNA of 50 vampires, these products were sequencing resulting in eight haplotypes being the most common presented in 43 individuals. Two methods to reach maximum likelihood and parsimony were used. GENBANK sequences of mitochondrial markers s16 rRNA from Brazil, Venezuela and Costa Rica were used for comparison. Higher similarity between vampire bats from Valle del Cauca and Cauca region, located in the southwest Colombia and vampire bats from Costa Rica and Venezuela was found. In the present study the genetic profiles correlated with the phylogeographic aspects of different populations was performed and a connection between different haplotypes of existing clades was found according to the phylogenetic tree and haplotype net, possible being generated during hematophagous bats migration over the mountain-chain and rivers crossing Colombia.
Luke D. Dijkstra - One of the best experts on this subject based on the ideXlab platform.
-
Structural characteristics of the Patagium of Ptychozoon kuhli (Reptilia: Gekkonidae) in relation to parachuting locomotion
Journal of morphology, 2001Co-Authors: Anthony P. Russell, Luke D. Dijkstra, G. Lawrence PowellAbstract:Ptychozoon kuhli is known for its parachuting/gliding capabilities. In this contribution, we document the allometric scaling properties of its Patagium, accessory flaps and folds, and its total body surface area and compare them to similar attributes of the agamine lizard Draco volans. Ptychozoon kuhli has passive patagia that lack skeletal support and muscular control. Patagial area in P. kuhli is smaller than that in D. volans for individuals of identical snout-vent length, but the accessory folds and flaps compensate for this shortfall and overall P. kuhli has equivalent total body surface area to D. volans for equally sized individuals. The structure of the Patagium of Ptychozoon kuhli was investigated in terms of its scalation patterns and structural integrity, its relationship to the body wall and its mechanism of erection, and the distribution of mechanoreceptive sensilla across its surface. Scalation patterns and the internal architecture of the Patagium indicate how its shape and form are maintained as it erects and becomes exposed to air flow. Its cross-sectional shape, together with that of the entire body indicates how it is able to behave as an airfoil. The distribution of sensilla across the patagial surface reflect positioning indicative of the monitoring of scale-to-scale contact on the dorsal surface, and possibly air pressure and flow on the ventral surface. J. Morphol. 247:252–263, 2001. © 2001 Wiley-Liss, Inc.
-
Patagial morphology of Draco volans (Reptilia: Agamidae) and the origin of glissant locomotion in flying dragons
Journal of Zoology, 2001Co-Authors: Anthony P. Russell, Luke D. DijkstraAbstract:The integrative patagial morphology of Draco volans was examined to elucidate the possible evolutionary pathway of origin of active patagia in the flying dragons and in extinct taxa that are thought to have possessed similarly constructed flight membranes. The area of the patagia and accessory aerodynamic surfaces is compared between Draco volans and Ptychozoon kuhli , a gekkonid with passive patagia. Comparisons of patagial area are also made between selected species of Draco . Scale architecture of the Patagium of Draco is described and is related to pertinent aspects of the structure and properties of the integument. The relationships of these characteristics to the morphology of the ribs and their related musculature are emphasized. The overall assessment of these features in relation to patagial form is employed to develop an evolutionary scenario for the origin of active patagia.