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However, the anatomical details of their cranial and postcranial development have not been extensively studied, especially in Microhylidae. In this work, we studied the microhylid <jats:italic>Microhyla fissipes<\/jats:italic>, commonly known as the ornamented pygmy frog, a small\u2010sized frog with fast metamorphosis. Its osteological development was comprehensively described based on 120\u00a0cleared and stained specimens, including six tadpoles for each stage between 28 and 45, six juveniles and six adults. Additionally, 22 osteological traits of these specimens involved in food acquisition, respiration, audition and locomotion were selected and measured to reflect the changes in tadpole ecological functions during metamorphosis. Our study provides the first detailed qualitative and quantitative developmental information about these structures. Our results have confirmed that skeletal elements (viz., neopalatines, omosternum, clavicles and procoracoids) absent in adults are not detected during development. Our data reveal that morphologically, radical transformations of the cranial structures related to feeding and breathing are completed within stages 42\u201345 (72\u00a0h), but the relative length and width of these skeletons have changed in earlier stages. The postcranial skeletons correlated with locomotion are well developed before stage 42 and approach the adult morphology at stage 45. Indeed, the relative length of the pectoral girdle and forelimb reaches the adult level at stage 42 and stage 45, respectively, whereas that of the vertebral column, pelvic girdle and hind limbs increases from their appearance until reaching adulthood. Based on published accounts of 19\u00a0species from Neobatrachia, Mesobatrachia and Archaeobatrachia, cranial elements are among the first ossified skeletons in most studied species, whereas sphenethmoids, neopalatines, quadratojugals, mentomeckelians, carpals and tarsals tend to ossify after metamorphosis. These results will help us to better understand the ecomorphological transformations of anurans from aquatic to terrestrial life. Meanwhile, detailed morphological and quantitative accounts of the osteological development of <jats:italic>Microhyla fissipes<\/jats:italic> will provide a foundation for further study.<\/jats:p>","DOI":"10.1111\/joa.13510","type":"journal-article","created":{"date-parts":[[2021,7,16]],"date-time":"2021-07-16T02:27:16Z","timestamp":1626402436000},"page":"1318-1335","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Osteological development of a small and fast metamorphic frog, <i>Microhyla fissipes<\/i> (Anura, Neobatrachia, Microhylidae)"],"prefix":"10.1111","volume":"239","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8803-9481","authenticated-orcid":false,"given":"Meihua","family":"Zhang","sequence":"first","affiliation":[{"name":"CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization &amp; Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu 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