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Sorbi, Silvia; Vaiani, Stefano Claudio
(detail)
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2007 |
New sirenian record from Lower Pliocene sediments of Tuscany (Italy).
Riv. Ital. Pal. Strat. 113(2): 299-304. 1 tab. 3 figs. 1 pl. July 2007.
–Italian summ. Reports a badly eroded humerus of Metaxytherium cf. subapenninum from early Zanclean deposits (~5.1-4.5 Ma) at Camigliano.
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Bianucci, Giovanni; Carone, Giuseppe; Domning, Daryl Paul; Landini, Walter; Rook, Lorenzo; Sorbi, Silvia
(detail)
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2008 |
Peri-Messinian dwarfing in Mediterranean Metaxytherium (Mammalia: Sirenia): evidence of habitat degradation related to the Messinian Salinity Crisis. In: N.T. Boaz, A. El-Arnauti, P. Pavlakis, & M.J. Salem (eds.), Circum-Mediterranean geology and biotic evolution during the Neogene Period: the perspective from Libya.
Garyounis Scientific Bull., Special Issue 5: 145-157. 4 tabs. 1 fig.
–Summ.: [G. Carone], Bol. Gruppo Paleontologico Tropeano 10: 3-5, 5 figs., Dec. 2004.
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Sorbi, Silvia
(detail)
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2008 |
New record of Metaxytherium (Mammalia, Sirenia) from the lower Miocene of Manosque (Provence, France).
Geodiversitas 30(2): 433-444. 4 tabs. 5 figs.
–A skull and partial skeleton is described and referred to M. cf. krahuletzi.
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Clementz, Mark T.; Sorbi, Silvia; Domning, Daryl Paul
(detail)
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2009 |
Evidence of Cenozoic environmental and ecological change from stable isotope analysis of sirenian remains from the Tethys-Mediterranean region.
Geology 37(4): 307-310. 2 figs. https://doi.org/10.1130/G25533A.1 Apr. 2009.
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Bianucci, Giovanni; Gatt, Michael; Catanzariti, Rita; Sorbi, Silvia; Bonavia, Charles G.; Curmi, Richard; Varola, Angelo
(detail)
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2011 |
Systematics, biostratigraphy and evolutionary pattern of the Oligo-Miocene marine mammals from the Maltese Islands.
Geobios 44(6): 549-585. 28 figs. + 7 tables in online supplementary material. DOI: 10.1016/j.geobios.2011.02.009 Nov./Dec. 2011.
–Indet. sirs., 550-551, 555-556, 558, 560, 574-577, 579-581.
ABSTRACT: An overview of the upper Oligocene-upper Miocene marine sediments outcropping in the Maltese Islands provides a detailed stratigraphical setting of several marine mammal assemblages. The studied fossil material collected within the entire sequence, is now kept in the National Museum of Natural History of Mdina (Malta). Nannoplankton analysis of some selected sections, where mammal remains have been discovered, is also undertaken. The fossil marine mammals, consisting mostly of isolated ear bones and teeth, are referred to cetaceans (both mysticetes and odontocetes), sirenians, and pinnipeds. The cetacean record evidences an evolutionary pattern that agrees with the Oligo-Miocene general trend, characterized by the progressive rarefaction and disappearance of archaic families (squalodontids, waipatiids, and, maybe, mammalodontids), and by the appearance and diversification of the extant families represented within younger strata (kogiids, pontoporiids and ziphiids). Pontoporiids, waipatiids, and tentatively mammalodontids are here reported for the first time in the Mediterranean, while the kogiid record represents the only sure Miocene evidence of this family in the Mediterranean. The geographical distribution of the mammalodontids and the waipatiids, based on the Maltese and extra-Mediterranean records, supports an open communication between the Proto-Mediterranean and the Indo-Pacific during the late Oligocene. Sirenians are represented by several dugongid pachyosteosclerotic rib fragments, collected from upper Oligocene through upper Miocene sediments. Pinnipeds are represented by a femur fragment from the Serravallian, referred to an indeterminate monachine, a phocid subfamily already reported from the Mio-Pliocene of the Mediterranean.
RÉSUMÉ: Une vue d'ensemble des sédiments marins de l'Oligocène supérieur-Miocène supérieur affleurant dans les îles maltaises, complétée par une analyse du nannoplancton de quelques coupes sélectionnées, fournit un cadre stratigraphique détaillé pour plusieurs assemblages de mammifères marins, connus sur la base de restes fossiles collectés tout au long de la séquence et conservés au Muséum National d'Histoire Naturelle de Mdina (Malte). Les restes de mammifères marins, consistant principalement en os de l'oreille et dents isolés, sont raportés aux cétacés (mysticètes et odontocètes), siréniens et pinnipèdes. Le registre des cétacés montre une évolution des faunes en accord avec la tendance générale pour l'Oligo-Miocène, caractérisée par la raréfaction progressive et la disparition des familles archaïques (squalodontidés, waipatiidés et, peut-être, mammalodontidés) et par l'apparition et l'augmentation de la diversité des familles modernes, présentes dans les strates les plus récentes (kogiidés, pontoporiidés et ziphiidés). Les signalements de pontoporiidés, mammalodontidés et waipatiidés sont les premiers pour la Méditerranée, alors que l'identification d'un kogiidé est la seule preuve tangible de la présence de cette famille dans le Miocène de Méditerranée. Sur la base des identifications maltaises et extra-méditerranéennes, la distribution géographique des mammalodontidés et des waipatiidés soutient l'hypothèse d'une voie de communication entre la Proto-Méditerranée et la région indo-pacifique au cours de l'Oligocène supérieur. Le registre des siréniens consiste principalement en plusieurs fragments de côtes pachyostéosclérosées de dugongidé, collectées en continu dans les sédiments de l'Oligocène supérieur au Miocène supérieur. Les pinnipèdes sont représentés par un fragment de fémur, daté du Serravallien, rapporté à un monachiné indéterminé, une sous-famille de phocidés déjà signalée dans le Mio-Pliocène de Méditerranée.
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Domning, Daryl Paul; Sorbi, Silvia
(detail)
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2011 |
Rytiodus heali, sp. nov., a new sirenian (Mammalia: Dugonginae) from the Miocene of Libya.
Journal of Vertebrate Paleontology 31(6): 1338-1355. 1 tab. 13 figs. "Nov. 2011" (publ. online Nov. 8, 2011; mailed Dec. 29, 2011).
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Domning, Daryl Paul; Heal, Geoffrey J.; Sorbi, Silvia
(detail)
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2017 |
Libysiren sickenbergi, gen. et sp. nov.: a new sirenian (Mammalia, Protosirenidae) from the middle Eocene of Libya.
Jour. Vert. Pal. 37(2): https://doi.org/10.1080/02724634.2017.1299158. 4 tabs. 16 figs. + online supplementary material. Published online Apr. 28, 2017.
–ABSTRACT: Fossil sirenian specimens collected in 1964 by the late R. J. G. Savage's expeditions in north-central Libya are described. They come from early middle Eocene (lower Lutetian, 47.8–43.6 Ma) deposits at the locality of Bu el Haderait and represent a new genus and species, Libysiren sickenbergi. This animal is the largest known protosirenid, and the largest Eocene sirenian known to date (condylobasal length >420 mm). Its dental formula was apparently 3.1.5.3, with five premolar loci as in all other Eocene sirenians, but the teeth are mostly not preserved. Its postcranial skeleton is unknown except for the atlas, a thoracic vertebra, and rib fragments. Stable isotopes indicate a mostly seagrass diet and a habitat of fully marine salinity. The Protosirenidae presently comprise the genera Protosiren, Ashokia, and Libysiren, with their interrelationships unresolved. Together, they are most parsimoniously regarded as a paraphyletic group basal to both Trichechidae and Dugongidae. However, as more of their morphology and diversity are revealed, they may prove to be more closely allied to the former and may shed crucial light on the still-mysterious origins of the trichechids (manatees).
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Voss (Voß), Manja; Sorbi, Silvia; Domning, Daryl Paul
(detail)
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2017 |
Morphological and systematic re-assessment of the late Oligocene "Halitherium" bellunense reveals a new crown group genus of Sirenia.
Acta Palaeontologica Polonica 62(1): 163-172. 2 tabs. 2 figs. Publ. online March 6, 2017.
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Pandolfi, Luca; Collareta, Alberto; Bianucci, Giovanni; Contessi, Michela; Rook, Lorenzo; Sorbi, Silvia
(detail)
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2022 |
A large tusk of Metaxytherium (Dugongidae, Sirenia, Mammalia) from the Late Miocene of Montebamboli (southern Tuscany, Italy): evolutionary and paleoecological implications.
Bollettino della Società Paleontologica Italiana 61(2): 159-166. 4 figs.
–ABSTRACT - An isolated large tusk, belonging to the historical finds of the Collezione di Geologia "Museo Giovanni Capellini" (Bologna, Italy) and originally identified as belonging to a hippopotamus, is here described and reassigned to the genus Metaxytherium (Dugongidae, Sirenia, Mammalia). According to the museum label, this specimen originates from the now-exhausted lignite deposits of Montebamboli (Tuscany, central Italy); the latter are late Tortonian to early Messinian in age and were deposited in a lacustrine environment. The Montebamboli tusk displays strong similarities with an elderly Metaxytherium subapenninum specimen from the Pliocene deposits of Bra (Piedmont, northern Italy) as well as with an isolated Metaxytherium tusk, now apparently lost, from Miocene deposits of Son Morelló (Mallorca, Spain). The Late Miocene occurrence of a large-tusked Metaxytherium in the Mediterranean Basin calls into question the anagenetic trend previously proposed for the Euro-North African species of Metaxytherium, thus also stimulating further research on the intra- and interspecific tusk size variability within this lineage. Furthermore, this specimen represents the first record of a marine species from the lignites of Montebamboli, indicating the proximity of marine settings.
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Bibliography and Index of the Sirenia and Desmostylia 