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Inproceedings Reference The oldest blind snake is in the Early Paleocene of Europe
Scolecophidians or blind snakes are among the most primitive and smaller snakes in the world with an average of size of 10 cm. They are worm-like, fossorial, lucifugous and often colourless, eating ants, termites, and their larvae. Based on the revision of Vidal et al (2010) they are represented by 5 families mainly living in tropical areas and have had a long history on Gondwana. The only European representative of this group is Typhlops vermicularis that lives around the Mediterranean Basin. Here we describe two isolated procoelous trunk vertebrae from the early Paleocene of Hainin (MP1-5, Belgium), a locality already known for the oldest amphisbaenian lizards (Folie et al 2013) and the earliest European scincoid lizards (Folie et al 2005). These vertebrae are clearly attributed to a scolecophian by the following characters (List, 1966): they are 1.5 mm long and 1 mm high and wide; the centrum is narrow and the hemal keel is absent; the orientation of the prezygapophyses processes that serve for muscle attachment strongly differs from the one of the prezygapophyseal facets; the neural arch is depressed and does not present a posterior medial notch nor a neural spine. Fossil scolecophidians are identified based on their vertebrae but they are generally considered as not diagnostic at a familial, generic or specific level. However, some characters have recently been proposed to differentiate the family level on the basis of the shape and placement of the synapophyses, shape of the cotyle, size of the zygosphene, and shape of the prezygopophyseal facets (Gelnaw & Mead, 2010). Based on these features, the Hainin vertebrae differ from those of Anomalepidae and Leptotyphlopidae, and resemble those of Typhlopidae by similar neural arch morphology and height, development and orientation of the paradiapophysis, and morphology of the neural canal, cotyle and condyle. Record of fossil scolecophidians indicates their presence in North America, Europe, Africa and Australia. Before this study, the oldest representatives of this group were known from the late Paleocene of Adrar Mgorn (Ouarzazate Basin) in Morrocco and from the earliest Eocene of Dormaal (Tienen Formation, MP7) in Belgium. The scolecophidian from Hainin resembles more the one from Dormaal than that from Adrar Mgorn by narrower centrum and neural arch. The width of the neural arch in Typhlops is similar to both Belgian scolecophidians, however, the centrum is even narrower. By these characters, the scolecophidian from Hainin could represent a basal Typhlopidae.
Located in Library / RBINS Staff Publications
Inproceedings Reference A ziphodont crocodylomorph from the Eraly Eocene of Vastan Lignite Mine (Gujarat, India)
Since 2004, the early Eocene Vastan lignite mine (Cambay Shale Formation, Gujarat, Western India) has yielded a rich herpetofauna with frogs, snakes, and lizards (Rage et al., 2008; Folie et al., 2013; Rana et al., 2013). But it is only in January 2012 that the first crocodylomorph remains were retrieved all together in one very thin lens of a few meters width. This small collection includes 4 teeth, 3 fragmentary vertebrae, 1 fragmentary femur, and 2 metapodials. All the teeth are characterized by being distinctly elongated and labiolingually compressed. When well preserved, the mesiodistal carinae bear distinct serrations of the enamel (the ziphodont condition). The largest crown available is estimated to be at least 30 mm tall. In labial or lingual view, the outline of the crown is rather symmetrical. On the other hand, the smallest tooth is asymmetrical being curved in labial view with a nearly straight distal margin and a convex mesial margin. The fragmentary vertebrae share a slightly amphicoelous condition of the centrum. The largest centrum is 32.9 mm long and the neurocentral suture not clearly visible. A modest but well visible hypapophysis is placed close to the anterior edge of the centrum of both these vertebrae. The fragmentary left femur is represented by a proximal portion 45.0 mm long, extending from the totally eroded epiphysis to slightly distally to the fourth trochanter. The largest diameter at the level of the trochanter is 11.6 mm. The ziphodont crocodylomorph teeth reported from a few Paleogene localities of the Indian subcontinent have been referred to both Pristichampsinae and Sebecosuchidae (Sahni & Srivastava, 1976; Buffettaut, 1978; Sahni et al., 1978; Gupta & Kumar, 2013). However, the latter taxon is considered absent in the Tertiary of Asia and amphyplatian vertebrae found in association with ziphodont teeth have been referred to dyrosaurids (Buffettaut, 1978; Turner & Calvo, 2005). Although non-eusuchian crocodylomorphs are restricted to two groups in the Paleogene (Dyrosauridae and Sebecosuchia), our limited knowledge of their postcranial anatomy renders identification of fragmentary remains difficult. Different hypotheses for the identity of the crocodylomorph remains from Vastan are presented.
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Inproceedings Reference Amphisbaenes (Squamata) du Paléogène européen
Le groupe des amphisbaenes ne comprend que des lézards fouisseurs, aux habitudes presque exclusivement souterraines. Ils sont dépouvus de membres à l’exception des Bipedidae qui montrent deux petits appendices antérieurs. La monophylie des amphisbaenes a fréquemment été reconnue mais les relations entre ses membres sont toujours disputées et il y a souvent désaccord entre les études moléculaires et morphologiques. Rappelons que les amphisbaenes actuels regroupent six familles, les Rhineuridae, les Bipedidae (Amérique du Nord), les Amphisbaenidae (Afrique, Amérique du Sud et Centrale), les Trogonophiidae (Afrique, Arabie), les Blanidae (Région Méditerranéenne) et les Cadeidae (Antilles). Le registre fossile des amphisbaenes à longtemps été cantonné à l’Amérique du Nord et les formes européennes négligées, voire ignorées. Pourtant le Paléogène européen a livré un ensemble de fossiles d’amphisbaenes presque continu depuis le début du Paléocène à l’actuel. La présence des premiers amphisbaenes dans le Crétacé terminal de Lano (Espagne) n’est toujours pas confirmée. Par contre l’appartenance aux amphisbaenes des mâchoires et des vertèbres trouvées dans le Paléocène de Roumanie et du Bassin de Paris ne se discute pas (Folie et al, 2013). Certains de ces fossiles présentent un aspect primitif avec, entre autres, une rangée dentaire comportant toujours plus de dix dents. Les premiers fossiles attribuables à des familles actuelles sont reconnus dans le Paléogène américain (Rhineuridae) et le début de l’Eocène européen (Blanidae de Dormaal, Belgique). L’Oligocène européen livre les premiers fossiles d’Amphisbaenidae (Oligocène inférieur de Valbro) alors qu’il faut attendre le Pliocène (Maroc) pour voir les premiers restes de Trogonophiidae. Plus atypique, un lézard du gisement de Messel serait une forme d’amphisbaene primitif, montrant encore beaucoup de caractères de Lacertoidea (Lacertidae + Teiidae), le groupe frère des amphisbaenes selon les phylogénies moléculaires. Ce registre finalement très riche devient incontournable pour qui étudie l’évolution des amphisbaenes : datation des lignées ; distribution des familles et événements géologiques qui ont marqué l’histoire du groupe. Voici un exemple : La distribution géographique de la famille des Amphisbaenidae englobe l’Afrique et l’Amérique du Sud et Centrale. Le groupe est donc séparé par l’Atlantique et cette distribution est devenue une des références illustrant les vicariances faisant suite à la fragmentation du Gondwana, ici l’ouverture de l’Atlantique Sud durant le Crétacé inférieur. Cette interprétation a été prise en défaut par les datations moléculaires qui donnent un âge beaucoup trop jeune aux Amphisbaenidae (50 Myr ago, Vidal et al., 2008) pour avoir été séparés par l’ouverture de l’Atlantique. Le registre fossile confirme ce point de vue, avec la présence du premier fossile d’Amphisbaenidae dans l’Oligocène européen et l’absence de tout reste d’amphisbaeniens dans le Crétacé inférieur et la presque totalité du Crétacé supérieur.
Located in Library / RBINS Staff Publications
Proceedings Reference NEW DATA AND A REVIEW OF THE HYAENODONTANS FROM THE PALEOGENE OF AFRICA
Hyaenodontida is a group of carnivorously adapted mammals, which was successful in the Paleogene of Africa. Contrary to Laurasian representatives, African hyaenodontidans had no ecological competitors until the late Oligocene. On one hand, the late Eocene and early Oligocene hyaenodontidans have been known since the beginning of 20th century thanks to the discovery of fossils from the Fayum area (Egypt). On the other hand, the Paleocene-Middle Eocene history of these predators was clarified only recently thanks to fieldwork in Northern Africa (Algeria, Morocco, and Tunisia). The recent discovery of the koholiine, Lahimia, in the Paleocene of Ouled Abdoun Basin (Morocco) allows the origin of the African hyaenodontidans to be traced as far back as the Selandian. A second Paleocene taxon is recorded in the Ouarzazate Basin (Morocco): Tinerhodon from the Thanetian. Lahimia and Tinerhodon interestingly display two distinct dental morphologies: Tinerhodon has very primitive dental features, while Lahimia is derived in the secant morphology of its molars and loss of P1. These differences can be explained by a presently unknown Paleocene radiation. The recent discoveries of hyaenodontidans in the late early or early middle Eocene of Gour Lazib area (Algeria) and middle Eocene-early Oligocene of Dur At-Talah (Libya) show that three new families appeared in Africa, at least during the middle Eocene: Apterodontinae, Hyainailourinae, and Teratodontinae. The postcranial material of Apterodon shows that hyaenodontidans even occupied a semi-aquatic niche in Africa. New fossils from Chambi, in Tunisia, show a common carnivorous fauna with the sites from Gour Lazib area. Interestingly, hyainailourines and teratodontines were also present in southern Africa (Sperrgebiet, Namibia; Lutetian); this is evidence that hyaenodontidans had a wide African distribution. Hyaenodontidans show a global trend of body size increase during the Paleogene. However, the recent discovery of the small hyaenodontidan Furodon in the Gour Lazib area and Chambi shows that small hyaenodontidans co-existed with large ones. Several hypotheses on hyaenodontidan origins in Africa were proposed. Some assume an endemic African origin, while others suppose several trans-Tethyan dispersals from Laurasia to Arabo-Africa. The best evidence is for the dispersal of endemic African hyainailourines and apterodontines in Europe around the Eocene-Oligocene boundary, participating in the renewal of the European carnivorous fauna at the ‘Grande Coupure’.
Located in Library / RBINS Staff Publications
Inproceedings Reference Damage assessment of ferruginous sandstone by X-ray tomografie - the "Virgin Tower" of Zichem (Belgium)
The ferruginous sandstone of the Gothic “Virgin Tower” is suffering from a specific biological deterioration process triggered by perforating activities of mason bees. The damage due to these perforations causes extensive loss of material, so that a durable conservation of such degraded stoneblocks becomes questionable. In order to evaluate the conservation possibilities of stoneblocks damaged by perforating mason bees, an investigation of the internal structure by means of X-ray tomography was carried out. This investigation revealed that the cumulative effect of the digging work by multiple generations of mason bees may result in networks of perforations. Bioturbated sandstones were found to be most suitable for attack by mason bees because of morphological and geometrical compatibility between the original layered burrowings by marine organisms and those by the mason bees. As a conclusion, the conservation is not recommended of sandstoneblocks for which the load bearing capacity is endangered by the branched and layered perforations
Located in Library / RBINS Staff Publications
Inproceedings Reference A basal thunnosaurian from Iraq reveals disparate phylogenetic origins for Cretaceous ichthyosaurs.
Located in Library / RBINS Staff Publications
Inproceedings Reference New finds of goniatite anaptychi from the Frasnian (Upper Devonian) of Belgium.
Poster
Located in Library / RBINS Staff Publications
Inproceedings Reference First report on upper Frasnian cephalopods of the Lahonry quarry, Lompret, Belgium.
Poster
Located in Library / RBINS Staff Publications
Inproceedings Reference Epicymatoceras: an exotic evolute nautilid from the European latest Cretaceous that does it all different.
Talk presented by Jiri Frank on 09/09/2012 in session 10: Nautilids of the 9th ISCPP in Zurich, Switzerland
Located in Library / RBINS Staff Publications
Inproceedings Reference What about nautilids at the Cretaceous/Paleogene boundary?
Talk presented by Stijn Goolaerts on 09/09/2012 in session 10: Nautilids of the 9th ISCPP in Zurich, Switzerland
Located in Library / RBINS Staff Publications