New Material of the Pterosaur Gladocephaloideus Lü et al., 2012 from the Early Cretaceous of Liaoning Province, China, with Comments on Its Systematic Position
Fig 6
Transverse histological sections of the early juvenile tibia of Gladocephaloideus jingangshanensis (JPM 2014–004) viewed with polarized light microscopy.
A. Close-up of the inner midshaft of the left tibia showing well-formed concentric centripetal lamellae of primary osteons; note laminated arrangement of the endosteal layer. B. Magnified view of the cortical bone containing bulky interosteonal lacunae; note that the osteonal lacunae are either oval or flat. Abbreviations: cofi, collagen fibres; eol, endosteal layer; erl, endosteal resorption line; iosla, interosteonal lacunae; lovc, longitudinal vascular canal; osla, osteonal lacuna; oslam, osteonal lamella.