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Common Names: ćś‰é±—ç›®, serpents, lĂ©zards, snakes, amphisbĂ¨nes, amphisbaenians, lizards, squamates
1. The development of cephalic armor in the tokay gecko (Squamata: Gekkonidae: Gekko gecko).
Laver RJ, Morales CH, Heinicke MP, Gamble T, Longoria K, Bauer AM, Daza JD
Journal of morphology J. Morphol. The development of cephalic armor in the tokay gecko (Squamata: Gekkonidae: Gekko gecko). 213-228 10.1002/jmor.21092 Armored skin resulting from the presence of bony dermal structures, osteoderms, is an exceptional phenotype in gekkotans (geckos and flap-footed lizards) only known to occur in three genera: Geckolepis, Gekko, and Tarentola. The Tokay gecko (Gekko gecko LINNAEUS 1758) is among the best-studied geckos due to its large size and wide range of occurrence, and although cranial dermal bone development has previously been investigated, details of osteoderm development along a size gradient remain less well-known. Likewise, a comparative survey of additional species within the broader Gekko clade to determine the uniqueness of this trait has not yet been completed. Here, we studied a large sample of gekkotans (38 spp.), including 18 specimens of G. gecko, using X-rays and high-resolution computed tomography for visualizing and quantifying the dermal armor in situ. Results from this survey confirm the presence of osteoderms in a second species within this genus, Gekko reevesii GRAY 1831, which exhibits discordance in timing and pattern of osteoderm development when compared with its sister taxon, G. gecko. We discuss the developmental sequence of osteoderms in these two species and explore in detail the formation and functionality of these enigmatic dermal ossifications. Finally, we conducted a comparative analysis of endolymphatic sacs in a wide array of gekkotans to explore previous ideas regarding the role of osteoderms as calcium reservoirs. We found that G. gecko and other gecko species with osteoderms have highly enlarged endolymphatic sacs relative to their body size, when compared to species without osteoderms, which implies that these membranous structures might fulfill a major role of calcium storage even in species with osteoderms. Â© 2019 Wiley Periodicals, Inc. Laver Rebecca J RJ https://orcid.org/0000-0002-6319-7213 Research School of Biology, Australian National University, Canberra, Australia. Morales Cristian H CH https://orcid.org/0000-0001-9964-9173 Department of Biological Sciences, Sam Houston State University, Huntsville, Texas. Department of Biology, University of Texas at Arlington, Arlington, Texas. Heinicke Matthew P MP https://orcid.org/0000-0002-6021-8058 Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, Michigan. Gamble Tony T https://orcid.org/0000-0002-0204-8003 Department of Biological Sciences, Marquette University, Milwaukee, Wisconsin. Milwaukee Public Museum, Milwaukee, Wisconsin. Bell Museum of Natural History, University of Minnesota, Saint Paul, Minnesota. Longoria Kristin K https://orcid.org/0000-0003-0885-6148 Department of Biological Sciences, Sam Houston State University, Huntsville, Texas. Bauer Aaron M AM https://orcid.org/0000-0001-6839-8025 Department of Biology, Villanova University, Villanova, Pennsylvania. Daza Juan D JD https://orcid.org/0000-0002-5651-0240 Department of Biological Sciences, Sam Houston State University, Huntsville, Texas. eng DEB1555968 Division of Environmental Biology DEB1657527 Division of Environmental Biology DEB1657656 Division of Environmental Biology DEB1657662 Division of Environmental Biology Journal Article 2019 12 28 United States J Morphol 0406125 0022-2887 IM CT scans comparative anatomy endolymphatic sac osteoderms osteology reptiles 2019 08 29 2019 11 26 2019 12 11 2019 12 29 6 0 2019 12 29 6 0 2019 12 29 6 0 ppublish 31883155 10.1002/jmor.21092 REFERENCES, 2020
2. A comparative histological study of the osteoderms in the lizards Heloderma suspectum (Squamata: Helodermatidae) and Varanus komodoensis (Squamata: Varanidae).
Kirby A, Vickaryous M, Boyde A, Olivo A, Moazen M, Bertazzo S, Evans S
Journal of anatomy J. Anat. A comparative histological study of the osteoderms in the lizards Heloderma suspectum (Squamata: Helodermatidae) and Varanus komodoensis (Squamata: Varanidae). 10.1111/joa.13156 We describe the histological appearance of the osteoderms (ODs) of Heloderma suspectum and Varanus komodoensis using multiple staining and microscopy techniques to yield information about their morphology and development. Histological analysis showed that the ODs of H. suspectum are composed of three main tissue types, a superficial layer, herein identified as osteodermine, capping a base composed of Sharpey-fibre bone and lamellar bone rich in secondary osteons (Haversian bone tissue). In contrast, ODs in V. komodoensis are composed of a core of woven bone surrounded by parallel-fibred bone without a capping tissue. Thus, in these two species, ODs differ both in terms of their structural composition and in details of their skeletogenesis. The histology of the mineralised tissues observed in these two reptile taxa provides insights into the mechanism of formation of lizard ODs and presents a direct comparison of the histological properties between the ODs of the two species. These data allow greater understanding of the comparative histological appearance of the dermal bones of lizards and highlight their structural diversity. Â© 2020 The Authors. Journal of Anatomy published by John Wiley & Sons Ltd on behalf of Anatomical Society. Kirby Alexander A https://orcid.org/0000-0001-5736-3441 Department of Medical Physics and Biomedical Engineering, University College London, London, UK. Vickaryous Matthew M https://orcid.org/0000-0002-0093-0895 Department of Biomedical Sciences, University of Guelph, Guelph, ON, Canada. Boyde Alan A https://orcid.org/0000-0002-9871-5498 Dental Physical Sciences, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK. Olivo Alessandro A https://orcid.org/0000-0002-7150-2951 Department of Medical Physics and Biomedical Engineering, University College London, London, UK. Moazen Mehran M https://orcid.org/0000-0002-9951-2975 Department of Mechanical Engineering, University College London, London, UK. Bertazzo Sergio S https://orcid.org/0000-0003-4889-8190 Department of Medical Physics and Biomedical Engineering, University College London, London, UK. Evans Susan S https://orcid.org/0000-0002-0799-4154 Department of Cell and Developmental Biology, University College London, London, UK. eng RGP0039/2019 Human Frontier Science Program EP/1789616 Engineering and Physical Sciences Research Council Journal Article 2020 01 27 England J Anat 0137162 0021-8782 IM Gila monster Komodo dragon histology lizard osteodermine osteoderms polarised light 2019 10 10 2019 12 03 2020 01 06 2020 1 28 6 0 2020 1 28 6 0 2020 1 28 6 0 aheadofprint 31986227 10.1111/joa.13156 REFERENCES, 2020
3. Ultraviolet reflectance and pattern properties in Leopard geckos (Eublepharis macularius).
Abramjan A, BaranovĂˇ V, FrĂ˝dlovĂˇ P, LandovĂˇ E, Frynta D
Behavioural processes, 2020
4. A new species of Oligodon Fitzinger, 1826 from the Langbian Plateau, southern Vietnam, with additional information on Oligodon annamensis Leviton, 1953 (Squamata: Colubridae).
Nguyen HN, Tran BV, Nguyen LH, Neang T, Yushchenko PV, Poyarkov NA
5. The iliosacral joint in lizards: an osteological and histological analysis.
Paparella I, LeBlanc ARH, Doschak MR, Caldwell MW
Journal of anatomy J. Anat. The iliosacral joint in lizards: an osteological and histological analysis. 10.1111/joa.13132 The development of the iliosacral joint (ISJ) in tetrapods represented a crucial step in the evolution of terrestrial locomotion. This structure is responsible for transferring forces between the vertebral column and appendicular skeleton, thus supporting the bodyweight on land. However, most research dealing with the water-to-land transition and biomechanical studies in general has focused exclusively on the articulation between the pelvic girdle and femur. Our knowledge about the contact between the pelvic girdle and vertebral column (i.e. the ISJ) at a tissue level is restricted so far to human anatomy, with little to no information available on other tetrapods. This lack of data limits our understanding of the development and evolution of such a key structure, and thus on the pattern and processes of the evolution of terrestrial locomotion. Therefore, we investigated the macro- and microanatomy of the ISJ in limb-bearing squamates that, similar to most non-mammalian, non-avian tetrapods, possess only two sacral ribs articulating with the posterior process of the ilium. Using a combination of osteology, micro-computed tomography and histology, we collected data on the ISJ apparatus of numerous specimens, sampling different taxa and different ontogenetic stages. Osteologically, we recorded consistent variability in all three processes of the ilium (preacetabular, supracetabular and posterior) and sacral ribs that correlate with posture and locomotion. The presence of a cavity between the ilium and sacral ribs, abundant articular cartilage and fibrocartilage, and a surrounding membrane of dense fibrous connective tissue allowed us to define this contact as a synovial joint. By comparison, the two sacral ribs are connected to each other mostly by dense fibrous tissue, with some cartilage found more distally along the margins of the two ribs, defining this joint as a combination of a syndesmosis and synchondrosis. Considering the intermediary position of the ISJ between the axial and appendicular skeletons, the shape of the articular surfaces of the sacral ribs and ilium, and the characteristics of the muscles associated with this structure, we argue that the mobility of the ISJ is primarily driven by the movements of the hindlimb during locomotion. We hypothesize that limited torsion of the ilium at the ISJ happens when the hip is abducted, and the joint is likely able to absorb the compressional and extensional forces related to the protraction and retraction of the femur. The mix of fibres and cartilage between the two sacral ribs instead serves primarily as a shock absorber, with the potential for limited vertical translation during locomotion. Â© 2019 Anatomical Society. Paparella Ilaria I https://orcid.org/0000-0002-4645-5962 Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada. LeBlanc Aaron R H ARH https://orcid.org/0000-0002-2497-1296 Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada. Doschak Michael R MR Faculty of Pharmacy & Pharmaceutical Sciences and Department of Biomedical Engineering, University of Alberta, Edmonton, AB, Canada. Caldwell Michael W MW Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada. eng 23458 Natural Sciences and Engineering Research Council of Canada University of Alberta, Faculty of Science, Chairs Research Allowance Journal Article 2020 01 05 England J Anat 0137162 0021-8782 IM cartilage comparative osteology diapophyses histology iliosacral joint joints lymphapophyses micro-computed tomography sacral ribs sacral vertebrae sacrum squamata synovial joint transverse processes 2019 11 14 2020 1 7 6 0 2020 1 7 6 0 2020 1 7 6 0 aheadofprint 31903561 10.1111/joa.13132 REFERENCES, 2020
6. Hemipenial morphology of nine South American species of Mabuya (Scincidae: Lygosominae) with comments on the morphology of the family.
SĂˇnchez-MartĂnez PM, RamĂrez-Pinilla MP, Meneses-Pelayo E, Nunes PMS
Anatomical record (Hoboken, N.J. : 2007) Anat Rec (Hoboken) Hemipenial morphology of nine South American species of Mabuya (Scincidae: Lygosominae) with comments on the morphology of the family. 10.1002/ar.24329 Species of the genus Mabuya are barely recognizable because of their highly conservative external morphology, resulting in unstable systematic and taxonomic status. Considering that hemipenial morphology has been extensively used as a source of systematic information for several groups of Squamata, we described the hemipenial morphology of nine species of Mabuya, searching for diagnostic features useful to taxonomic and systematic studies. To have comparative parameters within the family, we also presented the description of the hemipenes of two other Scincidae species (i.e., Trachylepis atlantica and Tiliqua rugosa). This information, together with the available literature, was analyzed in a comparative framework, allowing us to define some variation for the genus and family. The hemipenial morphology of the species of Mabuya studied is very conservative; features that show subtle variation were the shape of the protuberances present on the asulcate face of the hemipenial body and the presence and type of a lateral fold, on the body. Also, within the family, some variation was found in the shape and length of lobes, length of branches of the sulcus spermaticus, and in the kind of folds and protuberances in both faces of the lobes and hemipenial body. Although these features were not tested in a systematic context, this information suggested variations in hemipenial morphology that could contribute to taxonomic diagnostics and phylogenetic characters. The importance of obtaining proper preparations for gathering accurate information is emphasized, and the use of fresh-killed specimens that shows fewer difficulties for the procedures of preparation is highly recommended. Â© 2019 American Association for Anatomy. SĂˇnchez-MartĂnez Paola MarĂa PM https://orcid.org/0000-0002-7791-1326 Grupo de MorfologĂa y EcologĂa Evolutiva, Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Sede BogotĂˇ, Colombia. RamĂrez-Pinilla Martha Patricia MP Escuela de BiologĂa, Universidad Industrial de Santander, Bucaramanga, Colombia. Meneses-Pelayo Elson E Grupo de estudios en anfibios y reptiles de Santander (GEARS), Universidad Industrial de Santander, Bucaramanga, Santander, Colombia. Nunes Pedro M Sales PMS Departamento de Zoologia, Centro de BiociĂŞncias, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil. eng 432506/2018-7 Conselho Nacional de Desenvolvimento CientĂfico e TecnolĂłgico (CNPq) 313622/2018-3 Conselho Nacional de Desenvolvimento CientĂfico e TecnolĂłgico (CNPq) Journal Article 2019 12 09 United States Anat Rec (Hoboken) 101292775 1932-8486 IM comparative anatomy hemipenial morphology skinks taxonomy 2019 04 11 2019 09 09 2019 10 25 2019 12 10 6 0 2019 12 10 6 0 2019 12 10 6 0 aheadofprint 31815369 10.1002/ar.24329 REFERENCES, 2019
7. Comparative morphology and trophic ecology in a population of the polymorphic lizard Sceloporus minor (Squamata: Phrynosomatidae) from central Mexico.
GarcĂa-Rosales A, RamĂrez-Bautista A, Stephenson BP
8. First nearly complete skull of Gallotia auaritae (lower-middle Pleistocene, Squamata, Gallotiinae) and a morphological phylogenetic analysis of the genus Gallotia.
Cruzado-Caballero P, Castillo Ruiz C, Bolet A, Colmenero JR, De la Nuez J, Casillas R, Llacer S, Bernardini F, Fortuny J
Scientific reports, 2019
9. A new species of the genus Acanthosaura from Yunnan, China (Squamata, Agamidae).
Liu S, Rao D
10. A New Species of Lizard Endemic to Sierra de FiambalĂˇ, Northwestern Argentina (Iguania: Liolaemidae: Phymaturus). Integrated Taxonomy Using Morphology and DNA Sequences: Reporting Variation Within the antofagastensis Lineage.
Fernando L, Hibbard T, Quipildor M, Valdecantos S
Zoological studies, 2019