INVESTIGADORES
ZURITA Alfredo Eduardo
congresos y reuniones científicas
Título:
A new species of Neosclerocalyptus Paula Couto (Mammalia: Xenarthra: Cingulata): the oldest record of the genus. Morphological and phylogenetic aspects
Autor/es:
ZURITA, A. E; TAGLIORETTI, M.; ZAMORANO, M.; SCILLATO-YANÉ, G. J.; LUNA, C.; BOH, D.; MAGNUSSEN SAFER, M.
Reunión:
Congreso; XXVI Jornadas Argentinas de Paleontología de vertebrados; 2013
Institución organizadora:
APA
Resumen:
Among South American Quaternary Glyptodontidae,
Neosclerocalyptus Paula Couto
represents one of the best known genera. Until this contribution, four species
were recognized. N. pseudornatus
(Ameghino) and N. ornatus (Owen)
(Ensenadan Age/Stage, early-middle Pleistocene); N. gouldi Zurita (Bonaerian Age/Stage, middle Pleistocene-late
Pleistocene), and N. paskoensis (Zurita)
(Lujanian Age/Stage, late Pleistocene-early Holocene). One of the most
noticeable characters of the species of the genus is represented by a modified
area located in the distal part of the nasals, recently interpreted as a
neomorphic structure derived from the ossification of the nasal cartilages. In
this contribution, a new species of Neosclerocalyptus,
which also represents the oldest record of the genus, is presented and
described. In addition, a cladistic analysis is carried out to test the
monophyly of Neosclerocalyptus and
the location of this new species. The material (MPH 0114) comes from Vorohuean (late Pliocene)
levels in the surroundings of Miramar, Buenos Aires province, Argentina. Among other
morphological characters, this new species has ossified nasal cartilages
restricted to the latero-dorsal area of the nasals, whereas in the remaining
species these structures appear as more expanded and both sides contact in the
midline of the skull. In turn, the phylogenetic analysis confirmed the
monophyly of Neosclerocalyptus,
whereas Neosclerocalyptus sp. nov.
appears closely related to N.
pseudornatus, being N. ornatus
the sister taxa of this clade. On the other hand, N. gouldi + N. paskoensis
constitute the other clade. As previous hypothesis the clade constituted by Hoplohorus euphractus Lund + Panochthus intermedius Lydekker
constitutes the sister taxa of Neosclerocalyptus.