Entre el 11 y el 15 de noviembre se presentó en el 85th Annual Meeting de la Society of Vertebrate Paleontology celebrado en Birmingham (Reino Unido) el estudio sobre el conjunto de microvertebrados fósiles del yacimiento de Lo Hueco (Cuenca, España). El yacimiento de Lo Hueco, desde su descubrimiento en 2007, ha demostrado tener una gran importancia en la paleontología española y europea. Contando con más de 10,000 restos fósiles, se considera una de las localidades del Cretácico Superior más importante de Europa. Con el fin de conocer más a detalle la diversidad de vertebrados presentes en la localidad, se ha llevado a cabo un estudio de microvertebrados a través del screenwhashing de sedimentos procedentes de uno de los niveles estratigráficos de la localidad. Este estudio ha mostrado que el conjunto de microvertebrados está compuesto por diferentes peces, ranas, cocodrilos y terópodos pequeños, con una diversidad comparable a las de otras localidades de la Península Ibérica. Sin embargo, también cuenta con una combinación única que por el momento lo diferencia del resto de localidades contemporáneas de la península ibérica. El resumen es el siguiente:
The Konzentrat-Lagerstätte site ‘Lo Hueco’, Central Spain, represents extremely rich and diverse late Campanian-early Maastrichtian fossil assemblages with more than 10,000 fossil remains. Because of this, it is considered one of the most relevant paleontological sites for the study of continental vertebrate faunas from the Upper Cretaceous of Europe. Its stratigraphic succession is characterized by an alternation of green, gray and red marly mudstone separated by gradual boundaries and punctually altered by sandy channel structures and sulphate intervals.The microvertebrate sample was obtained from the screenwashing and sorting of 200 kg of sediments that belonged to one of the gray mudstone beds (G2). This bed is the richest lithosome in terms of microvertebrate fossil abundance and diversity from the site. Among the fossil material, the most common are attributed to fishes, especially the conical teeth and ganoid scales of Lepisosteidae. To a lesser degree, there are lanceolate teeth of Amiidae? and molariform teeth of Pycnodontiformes and Paralbulinae. The Lissamphibia material is represented by appendicular elements assigned to Anura, where two of the three recovered humeri can be assigned to Discoglossinae and Palaeobatrachidae. A small fragment with a pleurodont tooth indicates the presence of a scincomorph lizard. Crocodylomorpha remains correspond to at least six tooth morphotypes assigned tentatively to Allodaposuchidae (bulbous to elongated conical teeth) and ‘atoposaurid’ (triangular labiolingually compressed teeth). Theropod tooth specimens constitute an important part of the diversity reported here. It includes two dromaeosaurid tooth morphotypes, the cf. Dromeosaurinae specimens with small chisel-like denticles and the cf. Velociraptorinae specimens with hooked distal denticles. A small triangular shaped tooth with very small denticle is attributed to Richardoestesia sp. Apex teeth fragments with both mesial and distal large hooked denticles are tentatively assigned to Troodontidae, but this identification should be taken with caution. This microvertebrate assemblage is consistent with other upper Campanian-lower Maastrichtian Iberian Peninsula localities with coastal or freshwater with marine influence environments.Additionally, the presence of pycnodontid, atoposaurid, and the absence of albanepertontids and hylaeochampsids provide a unique set of fauna that distinguishes it from other contemporary Iberian Peninsula localities.
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