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| Salwasiren qatarensis Pyenson, Sakal, LeBlanc, Blundell, Klim, Marshall, Velez-Juarbe, Wolfe & Al-Naimi, 2025 Artwork: Alex Boersma |
Abstract
Coastal ecosystems that include seagrasses are potential carbon sinks that require strategic conservation of top trophic consumers, such as dugongs, to maintain their function. It is unclear, however, how long seagrass ecosystems have persisted in geologic time because their fossil record is poor, although the record of their associated vertebrate consumers offers useful proxies. Here we describe an area of dense Early Miocene dugongid remains from Qatar. We documented over 172 sites in <1 km2 from one stratigraphic level, including material representing a new species of fossil dugongine dugongid. This taxon is unrelated to coeval Early Miocene dugongids from India and the Eastern Tethys and it is distantly related to extant dugongs, which occupy seagrass habitats of the Persian or Arabian Gulf (hereafter ‘Gulf’) today. The monodominant assemblage in this area likely reflects a single fossil dugongid taxon and matches the ecological diversity and geospatial distribution of modern-day live-dead assemblages in the Gulf. This fossil site from Qatar shows that the Gulf has repeatedly evolved sea cow communities with different taxa over the past 20 million years and coincides with an Early Miocene marine biodiversity hotspot in Arabia, prior to its eastward shift to the Indo-Australian Archipelago where dugongs continue to thrive today.
Keywords: Marine mammal, Paleoecology, Seagrasses, Evolution, Fossil record
Mammalia Linnaeus, 1758
Afrotheria Stanhope et al., 1998
Tethytheria McKenna, 1975
Sirenia Illiger, 1811 sensu Vélez-Juarbe & Wood, 2018
Dugongidae Gray, 1821 sensu Vélez-Juarbe & Wood, 2018
Dugonginae Gray, 1821 (Simpson, 1932) sensu Vélez-Juarbe & Wood, 2018
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| Salwasiren qatarensis morphology using 3D photogrammetry of μCT of key skeletal elements. (A–C) holotype cranium including left premaxilla, jugal, and partial braincase; (D–F) referred left incisor; (G–H) holotype left upper M2, in mesial and occlusal views, respectively; (I) holotype incomplete left mandible; (J–M) holotype lumbar, sacral, and caudal vertebrae in anterior views with left ilium (L) in lateral view; and (N–O) holotype right humerus. Abbreviations: a, acetabulum; ac, anterior cingulum; acv, anterior cingular valley; an, angular process; co, coronoid process; cc, coronoid canal; dc, deltoid crest; f, frontal; gt, greater tubercle; h, humeral head; it, ischial tuberosity; j, jugal; lt, lesser tubercle; mcl+hy, metaconule + hypocone; me, metacone; ns, neural spine; p, parietal; pa, paracone; pmx, premaxilla; pr, protocone; ptp, posttympanic process; so, supraoccipital; sop, supraorbital process; sq, squamosal; tp, transverse process; tr, trochlea; zp, zygomatic process. |
Salwasiren qatarensis gen. et sp. nov.
Type locality, horizon, and age: Al Maszhabiya bonebed, Lower Al-Kharrara Member of the Dam Formation, Aquitanian, 23.03–21.6 Ma.
Differential diagnosis: Salwasiren is a dugongine distinguished from other sirenians by the following combination of characters: nasal process of the premaxilla long, thin and tapering at posterior end (c.6[0], 7[0]) as in Crenatosiren olseni and Dugong dugon; supraorbital process of frontal dorsoventrally thick with a weakly developed posterolateral corner (c.36[1]), as in C. olseni and D. dugon; deep and narrow nasal incisure (c.37[1]) as in most dugongines; flat frontal roof (c.42[0], as in C. olseni, Italosiren bellunensis and Bharatisiren indica; supraoccipital wider ventrally than dorsally (c.23[1]) and exoccipitals not meeting along a dorsal suture (c.66[1]), as in Nanosiren spp. and D. dugon; ventral extremity of jugal under posterior edge of orbit (c.85[1]) and flat, thin preorbital process of jugal (c.88[0]), shared with C. olseni and Nanosiren spp.; short zygomatic process of the jugal (c.89[1]), as in Dioplotherium manigaulti and Xenosiren yucateca; ventral rim of orbit that does not overhang the lateral surface (c.90[0]), as in I. bellunensis and Callistosiren boriquensis; mandible with broad, subrectangular symphysis (c.121[3]); I1 alveolus small (c.140[0]) as in Nanosiren spp.; I1 with suboval cross section and enamel on all sides (c.141[0], 142[0]), as in C. olseni and N. sanchezi; pubis prong-like without symphysis (c.215[2]).
Etymology: “Salwa” after the Bay of Salwa, part of the transboundary habitat for dugongs in the Gulf combined with the Latin “siren”, referring to Sirenia. The species epithet honors its discovery in the State of Qatar.
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| Nicholas Pyenson, the curator of fossil marine mammals at the Smithsonian's National Museum of Natural History, and Ferhan Sakal, an archaeologist who is the head of excavation and site management at Qatar Museums, survey Al Maszhabiya with the fossil ribs of a 21-million-year-old sea cow in the foreground. photo by Clare Fieseler |
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| An artistic reconstruction of a herd of Salwasiren qatarensis sea cows foraging on the seafloor. In southwest Qatar, fossils of a new species of ancient sea cow, Salwasiren qatarensis, were found in 21-million-year-old rocks along with evidence of extinct sharks, barracuda-like fish, prehistoric dolphins and sea turtles. Artwork: Alex Boersma |
Nicholas D. Pyenson, Ferhan Sakal, Jacques LeBlanc, Jon Blundell, Katherine D. Klim, Christopher D. Marshall, Jorge Velez-Juarbe, Katherine Wolfe and Faisal Al-Naimi. 2025. High Abundance of Early Miocene Sea Cows from Qatar shows repeated Evolution of Seagrass Ecosystem Engineers in Eastern Tethys. PeerJ. 13:e20030. DOI: doi.org/10.7717/peerj.20030 [December 10, 2025]
https://www.smithsonianmag.com/smart-news/a-trove-of-sea-cow-fossils-in-qatar-reveals-a-new-species-that-munched-on-seagrass-21-million-years-ago-180987820/
