“…1A,C ) rules out preparation marks as a possible origin of these structures. Furthermore, the LSF images are consistent with the morphology of the Las Hoyas specimens Eoalulavis MPCM-LH-13500 13 , 14 , Concornis MPCM-LH-2814 13 , 15 , 16 and isolated feathers 4 . Figure 2 Preserved feathering of Spanish enantiornithine hatchling MPCM-LH-26189 under LSF and white light.…”
Section: Resultssupporting
confidence: 72%
“…5 caption of 1 ) this implies a developmental strategy towards the altricial end of the altricial-precocial developmental spectrum, which would be unexpected evidence of enantiornithine reproductive behavior. Given the exceptional preservation of the Las Hoyas fossil record 2 , and of feathers in particular 3 , 4 , here we evaluate the developmental strategy of MPCM-LH-26189 using Laser-Stimulated-Fluorescence (LSF) 5 to identify possible additional evidence of preserved feathers. For instance, in MPCM-LH-26189 yellowish stains are preserved in various positions across the entire body (Fig.…”
Laser-Stimulated Fluorescence (LSF) is used to identify fully fledged feathering in the hatchling enantiornithine bird specimen MPCM-LH-26189, supporting precocial nesting behavior in this extinct group. The LSF results include the detection of a long pennaceous wing feather as well as cover feathers around the body. The LSF technique showed improved detection limits over and above synchrotron and UV imaging which had both been performed on this specimen. The findings underscore the value of using a wide range of analytical techniques.
“…1A,C ) rules out preparation marks as a possible origin of these structures. Furthermore, the LSF images are consistent with the morphology of the Las Hoyas specimens Eoalulavis MPCM-LH-13500 13 , 14 , Concornis MPCM-LH-2814 13 , 15 , 16 and isolated feathers 4 . Figure 2 Preserved feathering of Spanish enantiornithine hatchling MPCM-LH-26189 under LSF and white light.…”
Section: Resultssupporting
confidence: 72%
“…5 caption of 1 ) this implies a developmental strategy towards the altricial end of the altricial-precocial developmental spectrum, which would be unexpected evidence of enantiornithine reproductive behavior. Given the exceptional preservation of the Las Hoyas fossil record 2 , and of feathers in particular 3 , 4 , here we evaluate the developmental strategy of MPCM-LH-26189 using Laser-Stimulated-Fluorescence (LSF) 5 to identify possible additional evidence of preserved feathers. For instance, in MPCM-LH-26189 yellowish stains are preserved in various positions across the entire body (Fig.…”
Laser-Stimulated Fluorescence (LSF) is used to identify fully fledged feathering in the hatchling enantiornithine bird specimen MPCM-LH-26189, supporting precocial nesting behavior in this extinct group. The LSF results include the detection of a long pennaceous wing feather as well as cover feathers around the body. The LSF technique showed improved detection limits over and above synchrotron and UV imaging which had both been performed on this specimen. The findings underscore the value of using a wide range of analytical techniques.
“…Previous studies of plumage in Cretaceous amber have been based on isolated feathers, leaving taxonomy of the feather-bearers open to debate 5 6 , and amber in vertebrate bone beds has seldom yielded fossils 7 . Otherwise, Cretaceous feathers are commonly known from carbonaceous compression fossils 8 9 10 , and three-dimensional preservation in amber is extremely rare. The combined fossil record of amber and compression fossils has provided many insights into how the feather types associated with modern birds developed 11 12 , but these glimpses are restricted by preservation in each fossil type.…”
Our knowledge of Cretaceous plumage is limited by the fossil record itself: compression fossils surrounding skeletons lack the finest morphological details and seldom preserve visible traces of colour, while discoveries in amber have been disassociated from their source animals. Here we report the osteology, plumage and pterylosis of two exceptionally preserved theropod wings from Burmese amber, with vestiges of soft tissues. The extremely small size and osteological development of the wings, combined with their digit proportions, strongly suggests that the remains represent precocial hatchlings of enantiornithine birds. These specimens demonstrate that the plumage types associated with modern birds were present within single individuals of Enantiornithes by the Cenomanian (99 million years ago), providing insights into plumage arrangement and microstructure alongside immature skeletal remains. This finding brings new detail to our understanding of infrequently preserved juveniles, including the first concrete examples of follicles, feather tracts and apteria in Cretaceous avialans.
“…Documentation of a rachis-dominated feather from Kazakhstan expands the paleobiogeographic distribution of this kind of elongate tail feathers, up to now only reported from China, Spain and Brazil (e.g. Kellner 2002;Marugán-Lobón and Vullo 2011;Carvalho et al 2015aCarvalho et al , 2015b. Furthermore, the early Late Jurassic age of Praeornis posits it as one of the oldest findings of rachis-dominated feathers, together with similar-aged scansoriopterygids from China (Zhang et al 2008).…”
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