[D] Amargatitanis macni (sG] [T]
Describer
Apesteguia 2007
Time
Cretaceous Early Barremian
Classification
Saurischia Sauropodomorpha Sauropoda Titanosauria
Diet
Herbivore
Fossilsite
La Amarga Formation, Argentina
Info
Genus Typespecies
Holotype: MACN PV N51, 53, 34, represented by the following associated material collected in 1983: six caudal vertebrae, a scapula, a femur and one astragalus.
Etymology: Amarga, referring the fossil locality; titanis (Greek), titan, giant, because of the affinities of the specimen with the titanosaurs. In honor of the Museo Argentino de Ciencias Naturales (MACN) for the sustained contribution and human resources formed in Vertebrate Paleontology during the 19th and 20th centuries.
Horizon and locality: the fossil locality, as shown by the geologist Luis Cazau to Bonaparte, is located at the foot of the hill that rises over the left bank of the La Amarga stream, 2.5 km east from the 40th National Road . As described by Cazau and written by Bonaparte in his notebook, the levels correspond to the Kimmeridgian Pichi Picún Leufú Formation (Fossa Mancini et al., 1938), the basal unit of the Fortín Nogueira Group. If true, these fossils are much older than expected and very important because of their good preservation. However, the preservation is identical to that of bones coming form the La Amarga Formation and is here considered in that context.
Diagnosis: A. macni is diagnosed by the following associated characters. Robust, wide and flat scapula developed in a single plane, with straight, parallel anterior and posterior borders of the diaphysis. Acromion developed in straight line with respect to the diaphysis. Very short glenoid region, straight articulation for the coracoid, obtuse angle of coracoid articular surface with respect to the glenoid?scapular line, absence of scapular ventromedial process. Femoral fourth trochanter located at mid femur. Femur with a prominent head with respect to a moderately developed distal region. High astragalus with a deep crescentshaped fossa that bears two pairs of foramina on the upper part of the tibial side of the posterior astragalar fossa. On the fibular side, two foramina are visible also in a deep concavity.
Apesteguia 2007
Time
Cretaceous Early Barremian
Classification
Saurischia Sauropodomorpha Sauropoda Titanosauria
Diet
Herbivore
Fossilsite
La Amarga Formation, Argentina
Info
Genus Typespecies
Holotype: MACN PV N51, 53, 34, represented by the following associated material collected in 1983: six caudal vertebrae, a scapula, a femur and one astragalus.
Etymology: Amarga, referring the fossil locality; titanis (Greek), titan, giant, because of the affinities of the specimen with the titanosaurs. In honor of the Museo Argentino de Ciencias Naturales (MACN) for the sustained contribution and human resources formed in Vertebrate Paleontology during the 19th and 20th centuries.
Horizon and locality: the fossil locality, as shown by the geologist Luis Cazau to Bonaparte, is located at the foot of the hill that rises over the left bank of the La Amarga stream, 2.5 km east from the 40th National Road . As described by Cazau and written by Bonaparte in his notebook, the levels correspond to the Kimmeridgian Pichi Picún Leufú Formation (Fossa Mancini et al., 1938), the basal unit of the Fortín Nogueira Group. If true, these fossils are much older than expected and very important because of their good preservation. However, the preservation is identical to that of bones coming form the La Amarga Formation and is here considered in that context.
Diagnosis: A. macni is diagnosed by the following associated characters. Robust, wide and flat scapula developed in a single plane, with straight, parallel anterior and posterior borders of the diaphysis. Acromion developed in straight line with respect to the diaphysis. Very short glenoid region, straight articulation for the coracoid, obtuse angle of coracoid articular surface with respect to the glenoid?scapular line, absence of scapular ventromedial process. Femoral fourth trochanter located at mid femur. Femur with a prominent head with respect to a moderately developed distal region. High astragalus with a deep crescentshaped fossa that bears two pairs of foramina on the upper part of the tibial side of the posterior astragalar fossa. On the fibular side, two foramina are visible also in a deep concavity.