Alexandros Xafis

University of Vienna | UniWien · Institut für Paläontologie

Dental microwear analysis is a proxy for analysing the diet in extinct and extant vertebrates, especially mammals. The limits of these approaches are still rather poorly known, especially in terms of taphonomic impacts. Indeed, several physical or chemical phenomena may have altered the microscopic features linked to the diet and compromised their...

Fossil pollen believed to be related to extant Hagenia abyssinica were discovered in the early Miocene (21.73 Ma) Mush Valley paleoflora, Ethiopia, Africa. Both the fossil and extant pollen grains of H. abyssinica were examined with combined light microscopy, scanning electron microscopy, and transmission electron microscopy to compare the pollen a...

Kemiklitepe is a well-known locality with four recognised fossiliferous horizons, KTA to KTD, which have yielded a plethora of mammalian remains. Previous taxonomic studies indicate the presence of three giraffid taxa: Samotherium major and Palaeotragus rouenii from the uppermost three horizons, KTA, KTB and KTC, as well as Palaeotragus rouenii and...

Recent excavations at the Gračanica coal mine (Bugojno Basin, Bosnia-Herzegovina) have unearthed numerous skeletal parts of fossil vertebrates, including a noteworthy collection of mammalian remains. Previous palaeoecological investigations of the Dinarides Lake System were established using stratigraphical, palaeofloral, and malacological data. Ho...

The continued investigation of the middle Miocene palynoflora from the Lavanttal Basin reveals numerous additional angiosperm taxa. The Myrtales to Ericales pollen record documented here comprises 46 different taxa belonging to Onagraceae (Ludwigia), Ericaceae (Craigia, Reevesia, Tilia), Anacardiaceae (Pistacia), Rutaceae (Zanthoxylum), Sapindaceae...

Palaeontologists have known about the fossiliferous site at Thermopigi (Central Macedonia, N. Greece) for the past two decades. Following the first field campaigns a wealth of new information on the overall geology, taphonomy and palaeontology of the site became available. With more than 1300 fossils, representing at least 20 mammalian species, The...

The fossiliferous site at Kavakdere is one of many important late Miocene fossil mammal-bearing localities in Anatolia. Previous taxonomic studies on its fauna have revealed a plethora of taxa. However, the fossil Giraffidae from this early Turolian locality were until now poorly documented. New comprehensive descriptions, comparisons and metric an...

Alcicephalus neumayri is a large-sized giraffid, which is mostly known from its type locality, Maragheh, Iran. The taxon has also been reported from North China and it is in fact the most abundant giraffid known from the eastern outskirts of the Pikermian biome. Reassessment of previously studied material from the fossiliferous site at Kavakdere, r...

Sivatherium constitutes one of the most iconic extinct giraffids, mostly known from the Indian subcontinent and Africa. As the most prominent representative of the Sivatheriinae, the taxon, together with samotherines, symbolize an important clade of crown giraffids, exhibiting various early morphological evolutionary patterns. With only a few recog...

The pantropical Picrodendraceae produce mostly spheroidal to slightly oblate, echinate pollen grains equipped with narrow circular to elliptic pori that can be hard to identify to family level in both extant and fossil material using light microscopy only. Fossil pollen of the family have been described from the Paleogene of America, Antarctica, Au...

The palm family, Arecaceae, is notoriously depauperate in Africa today, and its evolutionary, paleobiogeographic, and extinction history there are not well documented by fossils. In this article we report the pollen of two new extinct species of the small genus, Sclerosperma (Arecoideae), from a late Oligocene (27–28 Ma) stratum exposed along the G...

Three currently accepted Sclerosperma species appear to produce four different pollen morphologies. Sclerosperma mannii and S. walkeri pollen share the same distinct reticulate sculpture, but S. profizianum produces three different pollen types (microreticulate, fossulate, and perforate). The pollen morphology suggests that S. mannii and S. walkeri...

The palm family, Arecaceae, is notoriously depauperate in Africa today, and its evolutionary, paleobiogeographic, and extinction history there are not well documented by fossils. In this article we report the pollen of two new extinct species of the small genus, Sclerosperma (Arecoideae), from a late Oligocene (27–28 Ma) stratum exposed along the G...

The palaeoecology of the basal turtle Proganochelys quenstedti has been open to debate. Whereas it was firstly described as semi-aquatic/aquatic, anatomical and histological data support adaptation to a terrestrial habitat. Our objective is to explore whether the palatal denticles of basal turtles could contain evidence of dental microwear. Two Pro...

An ongoing re-investigation of the early Miocene Saldanha Bay (South Africa) palynoflora, using combined light and scanning electron microscopy (single grain method), is revealing several pollen types new to the African fossil record. One of the elements identified is Loranthaceae pollen. These grains represent the first and only fossil record of L...

When applying high-resolution microscopy, the pollen morphology of extant taxa can be used to classify fossil pollen, that is, to address the latter in the established systematic-phylogenetic framework. Here we investigate tetrads and pollen features of 20 different Winteraceae species, most of them belonging to the early-diverging generic lineages...

Low magnification dental microwear constitutes one of the most important proxies on the ecology and evolution of diet in mammals. Numerous studies have been established on the reconstruction of dietary ecology of even-toed and carnivorous taxa. To date, these studies have used the second permanent molars or carnassials exclusively, for ungulates or...