INVESTIGADORES
ZAMORANO Martin
artículos
Título:
Redescripción de Panochthus subintermedius Castellanos (Xenarthra, Glyptodontidae), un Panochthinno Ensenadense
Autor/es:
CRUZ L. E.; ZAMORANO M.; SCILLATO-YANÉ G. J.
Revista:
PALAEONTOLOGISCHE ZEITSCHRIFT
Editorial:
SPRINGER HEIDELBERG
Referencias:
Año: 2011 vol. 85 p. 115 - 223
ISSN:
0031-0220
Resumen:
Panochthus subintermedius was originally
named by Castellanos in 1933, without any diagnosis and
no type material designated. In 1936, he briefly described
and designated a holotype for this species (MACN-Pv
5130) and subsequently, in 1942, completed the description,
but a diagnosis was still lacking. Some authors have
considered this species as nomem nudum, but others have
accepted its validity since 1942. In this contribution we
propose that Castellanoss 1936 paper is the valid nameestablishing
publication for this species. The holotype
includes a large portion of dorsal carapace, the caudal tube,
and remains of postcranial skeleton, belonging to a single
specimen from the Ensenadan Stage/Age (early-middle
Pleistocene) of Buenos Aires, Argentina. In contrast to the
original description, new observations of the holotype
reveal that the superficial surface of the dorsal carapace
osteoderms is ornamented with small polygonal figures
without a principal one. This ornamentation differs from
that of P. intermedius Lydekker (the only species accepted
up to now for the Ensenadan), with a central figure in most
of its osteoderms. The caudal tube of P. subintermediuswas originally
named by Castellanos in 1933, without any diagnosis and
no type material designated. In 1936, he briefly described
and designated a holotype for this species (MACN-Pv
5130) and subsequently, in 1942, completed the description,
but a diagnosis was still lacking. Some authors have
considered this species as nomem nudum, but others have
accepted its validity since 1942. In this contribution we
propose that Castellanoss 1936 paper is the valid nameestablishing
publication for this species. The holotype
includes a large portion of dorsal carapace, the caudal tube,
and remains of postcranial skeleton, belonging to a single
specimen from the Ensenadan Stage/Age (early-middle
Pleistocene) of Buenos Aires, Argentina. In contrast to the
original description, new observations of the holotype
reveal that the superficial surface of the dorsal carapace
osteoderms is ornamented with small polygonal figures
without a principal one. This ornamentation differs from
that of P. intermedius Lydekker (the only species accepted
up to now for the Ensenadan), with a central figure in most
of its osteoderms. The caudal tube of P. subintermediusnomem nudum, but others have
accepted its validity since 1942. In this contribution we
propose that Castellanoss 1936 paper is the valid nameestablishing
publication for this species. The holotype
includes a large portion of dorsal carapace, the caudal tube,
and remains of postcranial skeleton, belonging to a single
specimen from the Ensenadan Stage/Age (early-middle
Pleistocene) of Buenos Aires, Argentina. In contrast to the
original description, new observations of the holotype
reveal that the superficial surface of the dorsal carapace
osteoderms is ornamented with small polygonal figures
without a principal one. This ornamentation differs from
that of P. intermedius Lydekker (the only species accepted
up to now for the Ensenadan), with a central figure in most
of its osteoderms. The caudal tube of P. subintermediusP. intermedius Lydekker (the only species accepted
up to now for the Ensenadan), with a central figure in most
of its osteoderms. The caudal tube of P. subintermediusP. subintermedius
differs from those of the Bonaerian-Lujanian species
(middle late Pleistoceneearly Holocene), in having a
sharper distal end, one apical dorsal figure, and a higher
number of central figures along the entire dorsal surface.
No caudal tube associated with the carapace of P. intermedius
(middle late Pleistoceneearly Holocene), in having a
sharper distal end, one apical dorsal figure, and a higher
number of central figures along the entire dorsal surface.
No caudal tube associated with the carapace of P. intermedius
is known. Accordingly, P. subintermedius can be
clearly distinguished from other Panochthini species by a
unique combination of carapace and caudal tube characters.
This new combination of characters provides more
information on this taxon and other species of Panochthini
for future studies in the interrelationships of Glyptodontia.. Accordingly, P. subintermedius can be
clearly distinguished from other Panochthini species by a
unique combination of carapace and caudal tube characters.
This new combination of characters provides more
information on this taxon and other species of Panochthini
for future studies in the interrelationships of Glyptodontia.