111 Introduction Fossil Suoidea from the early Miocene deposits at Moghara, Egypt, were described by Pickford et al. (2010) who used them to estimate the age of the sedimentary succession. The main conclusion of that paper was that the Moghara deposits span the period ca. 17.8 to 16.4 Ma. The second conclusion was that some of the deposits at Moghara span the same time period as part of the sequence at Gebel Zelten, Libya (Arambourg 1961, 1963). These conclusions were based on records at Moghara of the sanithere Diamantohyus africanus, and three species of suids – Nguruwe kijivium, cf. Libycochoerus jeanneli, and Libycochoerus massai. Gebel Zelten has yielded the same species of sanithere, but the suids from the sedimentary sequence comprise the large kubanochoeres Libycochoerus massai and Kubwachoerus khinzikebirus (Pickford 2006, Pickford and Tsujikawa 2019) which suggest that at Zelten there are some deposits that are younger than the youngest strata at Moghara. The previous record of Libycochoerus massai from Moghara was based on three teeth – an isolated upper third molar curated at Cairo University (CUWM 132, feld number WM Dec-06-09), two canine fragments and a talus (Pickford et al. 2010), the last specimen now known to have been collected at Wadi Natrun (late Miocene). In the Cairo Geological Museum (CGM) there is another suid specimen collected from Moghara in 1994, consisting of a mandible with four teeth (p/4–m/3) which confrms the presence of this species at the site. Undescribed suoids from Moghara are herein added to the material described by Pickford et al. (2010) and a huge edentulous mandible from Gebel Zelten is described in detail, previous mention of the fossil only recording the dimensions of the canine and the m/2 (Pickford 2006). FOSSIL IMPRINT • vol. 77 • 2021 • no. 1 • pp. 111–125 NEW SUOID FOSSILS (MAMMALIA, ARTIODACTYLA) FROM THE MIOCENE OF MOGHARA, EGYPT, AND GEBEL ZELTEN, LIBYA: BIOCHRONOLOGICAL IMPLICATIONS MARTIN PICKFORD 1,* , MOHAMED ABDEL GAWAD 2 , MOHAMED HAMDAN 2 , AHMED N. EL-BARKOOKY 2 , MOHAMMED H. AL RIAYDH 3 1 Sorbonne Université (CR2P, MNHN, CNRS, UPMC – Paris VI), 8, rue Buffon, 75005 Paris, France; e-mail: martin.pickford@mnhn.fr. 2 Geology Department, Faculty of Sciences, Cairo University, Cairo, Egypt; e-mail: mkabdelgawad@gmail.com, hamdanmohamed@hotmail.com, abarkooky@hotmail.com. 3 Earth Sciences Department, Benghazi University, Benghazi, Libya, e-mail: moha88geology@yahoo.com. * corresponding author Pickford, M., Abdel Gawad, M., Hamdan, M., El-Barkooky, A. N., Al Riaydh, M. H. (2021): New suoid fossils (Mammalia, Artiodactyla) from the Miocene of Moghara, Egypt, and Gebel Zelten, Libya: biochronological implications. – Fossil Imprint, 77(1): 111–125, Praha. ISSN 2533-4050 (print), ISSN 2533-4069 (on-line). Abstract: Some undescribed suoid specimens from early and middle Miocene deposits at Moghara, Egypt, and Gebel Zelten, Libya, are of interest for biochronology. The fossils comprise maxillae and mandibles with incomplete dentitions, which are described and illustrated in detail. Three species of suids and one sanithere occur at Moghara. A huge edentulous suid mandible was collected at Gebel Zelten in 1997 during the Spanish-Libyan Palaeontology Expedition. In January, 2020, additional sanithere fossils were collected from Moghara by a team from Cairo University and the Muséum National d’Histoire Naturelle, Paris. A suid mandible with four teeth collected from Moghara in 1994, and now curated at the Cairo Geological Museum, confrms the presence of the species Libycochoerus massai at the site, previously represented by an isolated upper molar and two canines. A talus previously thought to be from Moghara is now known to have been collected at Wadi Natrun (late Miocene) and thus probably represents a tetraconodont rather than a kubanochoere. The age of the Moghara deposits is estimated to span the period ca. 19.5–16.5 Ma (late early Miocene, Faunal Sets PII–PIIIa) and the Zelten sequence is most likely to span the period ca. 17–14.5 Ma (late early Miocene to basal middle Miocene, Faunal Sets PIIIa–PIIIb). Key words: Suoidea, early Miocene, middle Miocene, biochronology, North Africa Received: January 29, 2021 | Accepted: April 27, 2021 | Issued: December 9, 2021 DOI 10.37520/fi.2021.010