Oligocene vertebrate footprints from the Lower Red Formation, Central Iran Author Abbassi, Nasrollah 0000-0002-9994-9122 Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, 45371 - 38971, Iran Author Salehi Tinooni, Mohammad Geological Survey of Iran, South-East Territory (Kerman), No. 10, Bastani-ye Parizi Blvd. Kerman, 76157 - 36841, Iran Author Ghorbani Dehnavi, Mahdi Geological Survey of Iran, South-East Territory (Kerman), No. 10, Bastani-ye Parizi Blvd. Kerman, 76157 - 36841, Iran Author Shakeri, Safoora Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan, 45371 - 38971, Iran & Research Affairs Office, Faculty of Engineering, University of Zanjan, Zanjan 45371 - 38971, Iran Author Eshaghi, Ali Research Affairs Office, Faculty of Engineering, University of Zanjan, Zanjan 45371 - 38971, Iran text Fossil Record 2024 2024-11-04 27 2 265 287 journal article 10.3897/fr.27.133914 A30F4FFF-547A-4323-80C0-771663DF6FB7 Ichnogenus Avipeda Vialov, 1965 Type ichnospecies. Avipeda phoenix Vialov, 1965 . Revised diagnosis. Avian footprints of small size (footprint length < 30 mm ), showing three short, thick digits, with distinct claws. Length of central digit ( III ) less than 25 % greater than that of the lateral digits. Total interdigital span 95 ° or more. Digits closely convergent or united proximally; webbing lacking or limited to the most proximal part of the interdigital angles (modified from Sarjeant and Langston 1994 ). Discussion. At first, Avipeda was the general name for tridactyl unwebbed bird footprints which was proposed by Vialov (1965) . Later, varieties of bird footprints were considered as ichnospecies of Avipeda with different size or morphologies showing similarities to several existing ichnogenera. Thus, Sarjeant and Langston (1994) emended the diagnosis and designated Avipeda phoenix ( Vialov 1965 ) as the type ichnospecies.